Dr. Ian Howard

Dr. Ian Howard

  • Engesserstrasse 13, Geb. 30.34
    76131 Karlsruhe

Research Interests

My research uses spectroscopy to explore the fundamental optoelectronic properties of solution-processable semiconductors. I am currently especially interested in organic semiconductors and metal organic frameworks. The ultimate goal of this research is to understand how energy flow is controlled at the nanoscale in these materials, and to use this knowledge to help design better materials for low-cost solar energy conversion.

For a complete list of publications please see my google citations, or ResearcherID profile.

Short CV

2014-present Group leader Advanced Materials and Optical Spectroscopy at KIT.
2009-2014 Alexander von Humboldt and Max Planck Fellow at the Max Planck Institute for Polymer Research in Mainz.
2005-2009 Ph.D in Physics from King's Collage, University of Cambridge. Performed in the Optoelectronics Group at the Cavendish Labratory unter the advisement of Prof. Neil Greenham. Title "Loss Mechanisms in High Open-Circuit Voltage Organic Sollar Cells".
2005 Undergraduate thesis with Prof. Sargent on solution-processed nanocrystal-baseed detectorts now commercialized through the spin-off company Invisage Inc.
2000-2005 Undergraduate degree in Engineering Science at the University of Toronto.

 

Publikationen


2022
Expanding the Angle of Incidence Tolerance of Unclonable Anticounterfeiting Labels Based on Microlens Arrays and Luminescent Microparticles
Kumar, V.; Dottermusch, S.; Chauhan, A.; Richards, B. S.; Howard, I. A.
2022. Advanced Photonics Research, 3 (6), Art.-Nr.: 2100202. doi:10.1002/adpr.202100202
Correlative In Situ Multichannel Imaging for Large-Area Monitoring of Morphology Formation in Solution-Processed Perovskite Layers
Ternes, S.; Laufer, F.; Scharfer, P.; Schabel, W.; Richards, B. S.; Howard, I. A.; Paetzold, U. W.
2022. Solar RRL, 6 (3), Art.-Nr. 2100353. doi:10.1002/solr.202100353
Limitation of room temperature phosphorescence efficiency in metal organic frameworks due to triplet-triplet annihilation
Zhao, T.; Busko, D.; Richards, B. S.; Howard, I. A.
2022. Frontiers in Chemistry, 10, Art.-Nr.: 1010857. doi:10.3389/fchem.2022.1010857
Charge Carrier and Exciton Dynamics in Perovskites Revealed by Time‐Integrated Photoluminescence after Double‐Pulse Excitation
Kaiser, M.; Li, Y.; Gharibzadeh, S.; Richards, B. S.; Paetzold, U. W.; Howard, I. A.
2022. Advanced Materials Technologies, Artkl.Nr.: 2200152. doi:10.1002/admt.202200152
Lasing from Laminated Quasi‐2D/3D Perovskite Planar Heterostructures
Li, Y.; Roger, J.; Allegro, I.; Fischer, J. C.; Jin, Q.; Lemmer, U.; Howard, I. A.; Paetzold, U. W.
2022. Advanced Functional Materials, 32 (27), Artkl.Nr.: 2200772. doi:10.1002/adfm.202200772
Unclonable Anti-Counterfeiting Labels Based on Microlens Arrays and Luminescent Microparticles
Kumar, V.; Dottermusch, S.; Katumo, N.; Chauhan, A.; Richards, B. S.; Howard, I. A.
2022. Advanced Optical Materials, 10 (9), Art.-Nr.: 2102402. doi:10.1002/adom.202102402
BODIPY–pyrene donor–acceptor sensitizers for triplet–triplet annihilation upconversion: the impact of the BODIPY-core on upconversion efficiency
Kiseleva, N.; Filatov, M. A.; Fischer, J. C.; Kaiser, M.; Jakoby, M.; Busko, D.; Howard, I. A.; Richards, B. S.; Turshatov, A.
2022. Physical chemistry, chemical physics, 24 (6), 3568–3578. doi:10.1039/d1cp05382e
Light Management for Enhancing Optical Gain in a Solar‐Pumped Fiber Laser Employing a Solid‐State Luminescent Solar Concentrator
Masuda, T.; Aoyagi, K.; Dottermusch, S.; Howard, I. A.; Richards, B. S.; Endo, M.
2022. Advanced photonics research, 3 (2), Art.Nr.: 2100214. doi:10.1002/adpr.202100214
2021
Experimental validation of a modeling framework for upconversion enhancement in 1D-photonic crystals
Hofmann, C. L. M.; Fischer, S.; Eriksen, E. H.; Bläsi, B.; Reitz, C.; Yazicioglu, D.; Howard, I. A.; Richards, B. S.; Goldschmidt, J. C.
2021. Nature Communications, 12 (1), Aricle no: 104. doi:10.1038/s41467-020-20305-x
Interface Pattern Engineering in Core-Shell Upconverting Nanocrystals: Shedding Light on Critical Parameters and Consequences for the Photoluminescence Properties
Hudry, D.; De Backer, A.; Popescu, R.; Busko, D.; Howard, I. A.; Bals, S.; Zhang, Y.; Pedrazo-Tardajos, A.; Van Aert, S.; Gerthsen, D.; Altantzis, T.; Richards, B. S.
2021. Small, 17 (47), Art.-Nr. 2104441. doi:10.1002/smll.202104441
The potential of SWCNTs to extend the IR-absorption of silicon solar cells
Wieland, L.; Rust, C.; Li, H.; Jakoby, M.; Howard, I.; Li, F.; Shi, J.; Chen, J.; Flavel, B. S.
2021. Carbon, 184, 828–835. doi:10.1016/j.carbon.2021.08.080
In situ reflectance- photoluminescence imaging on solution-processed perovskite thin-films
Ternes, S.; Laufer, F.; Scharfer, P.; Schabel, W.; Richards, B. S.; Howard, I. A.; Paetzold, U.
2021. 2021 IEEE 48th Photovoltaic Specialists Conference (PVSC), 1472–1475, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/PVSC43889.2021.9518569
Ratiometric Luminescent Thermometry with Excellent Sensitivity over a Broad Temperature Range Utilizing Thermally‐Assisted and Multiphoton Upconversion in Triply‐Doped La₂O₃:Yb³⁺/Er³⁺/Nd³⁺
Gao, G.; Busko, D.; Katumo, N.; Joseph, R.; Madirov, E.; Turshatov, A.; Howard, I. A.; Richards, B. S.
2021. Advanced optical materials, 9 (5), Art.-Nr.: 2001901. doi:10.1002/adom.202001901
Method for accurate experimental determination of singlet and triplet exciton diffusion between thermally activated delayed fluorescence molecules
Jakoby, M.; Heidrich, S.; Graf von Reventlow, L.; Degitz, C.; Suresh, S. M.; Zysman-Colman, E.; Wenzel, W.; Richards, B. S.; Howard, I. A.
2021. Chemical science, 12 (3), 1121–1125. doi:10.1039/d0sc05190j
Interpreting the Time-Resolved Photoluminescence of Quasi-2D Perovskites
Kaiser, M.; Li, Y.; Allegro, I.; Richards, B. S.; Paetzold, U. W.; Howard, I. A.
2021. Advanced Materials Interfaces, 8 (24), Art.-Nr.: 2101326. doi:10.1002/admi.202101326
Photon Upconversion for Photovoltaics and Photocatalysis: A Critical Review – Focus Review
Richards, B. S.; Hudry, D.; Busko, D.; Turshatov, A.; Howard, I. A.
2021. Chemical reviews. doi:10.1021/acs.chemrev.1c00034
Exciton versus free carrier emission: Implications for photoluminescence efficiency and amplified spontaneous emission thresholds in quasi-2D and 3D perovskites
Li, Y.; Allegro, I.; Kaiser, M.; Malla, A. J.; Richards, B. S.; Lemmer, U.; Paetzold, U. W.; Howard, I. A.
2021. Materials Today, 49, 35–47. doi:10.1016/j.mattod.2021.05.002
Anticounterfeiting Labels with Smartphone‐Readable Dynamic Luminescent Patterns Based on Tailored Persistent Lifetimes in GdOS:Eu/Ti
Katumo, N.; Ruiz-Preciado, L. A.; Kumar, V.; Hernandez-Sosa, G.; Richards, B. S.; Howard, I. A.
2021. Advanced materials technologies, 6 (7), Art.-Nr.: 2100047. doi:10.1002/admt.202100047
Solar Pumping of Fiber Lasers with Solid-State Luminescent Concentrators: Design Optimization by Ray Tracing
Dottermusch, S.; Masuda, T.; Endo, M.; Richards, B. S.; Howard, I. A.
2021. Advanced Optical Materials, 9 (12), Art.-Nr.: 2100479. doi:10.1002/adom.202100479
Revealing the internal luminescence quantum efficiency of perovskite films via accurate quantification of photon recycling
Fassl, P.; Lami, V.; Berger, F. J.; Falk, L. M.; Zaumseil, J.; Richards, B. S.; Howard, I. A.; Vaynzof, Y.; Paetzold, U. W.
2021. Matter, 4 (4), 1391–1412. doi:10.1016/j.matt.2021.01.019
Interplay of structural dynamics and electronic effects in an engineered assembly of pentacene in a metal–organic framework
Haldar, R.; Kozlowska, M.; Ganschow, M.; Ghosh, S.; Jakoby, M.; Chen, H.; Ghalami, F.; Xie, W.; c; Tsutsui, Y.; Freudenberg, J.; Seki, S.; Howard, I. A.; Richards, B. S.; Bunz, U. H. F.; Elstner, M.; Wenzel, W.; Wöll, C.
2021. Chemical science, 12 (12), 4477–4483. doi:10.1039/d0sc07073d
How free exciton-exciton annihilation lets bound exciton emission dominate the photoluminescence of 2D-perovskites under high-fluence pulsed excitation at cryogenic temperatures
Kaiser, M.; Li, Y.; Schwenzer, J.; Jakoby, M.; Allegro, I.; Gerhard, M.; Koch, M.; Ducinskas, A.; Richards, B. S.; Graetzel, M.; Milić, J. V.; Paetzold, U. W.; Howard, I. A.
2021. Journal of Applied Physics, 129 (12), Art.-Nr.: 123101. doi:10.1063/5.0037800
An up-conversion luminophore with high quantum yield and brightness based on BaF:Yb,Er single crystals
Madirov, E. I.; Konyushkin, V. A.; Nakladov, A. N.; Fedorov, P. P.; Bergfeldt, T.; Busko, D.; Howard, I. A.; Richards, B. S.; Kuznetsov, S. V.; Turshatov, A.
2021. Journal of materials chemistry / C, 9 (10), 3493–3503. doi:10.1039/d1tc00104c
Bimolecular and Auger Recombination in Phase-Stable Perovskite Thin Films from Cryogenic to Room Temperature and Their Effect on the Amplified Spontaneous Emission Threshold
Allegro, I.; Li, Y.; Richards, B. S.; Paetzold, U. W.; Lemmer, U.; Howard, I. A.
2021. The journal of physical chemistry letters, 12 (9), 2293–2298. doi:10.1021/acs.jpclett.1c00099
Rare-earth coordination polymers with multimodal luminescence on the nano-, micro-, and milli-second time scales
Jakoby, M.; Beil, C.; Nazari, P.; Richards, B. S.; Seitz, M.; Turshatov, A.; Howard, I. A.
2021. iScience, 24 (3), Art. Nr.: 102207. doi:10.1016/j.isci.2021.102207
Bright constant color upconversion based on dual 980 and 1550 nm excitation of SrF:Yb, Er and β-NaYF:Yb, Er micropowders― considerations for persistence of vision displays
Joseph, R. E.; Hudry, D.; Busko, D.; Biner, D.; Turshatov, A.; Krämer, K.; Richards, B. S.; Howard, I. A.
2021. Optical materials, 111, Art.Nr. 110598. doi:10.1016/j.optmat.2020.110598
2020
Tuning Optical Properties by Controlled Aggregation: Electroluminescence Assisted by Thermally‐Activated Delayed Fluorescence from Thin Films of Crystalline Chromophores
Wöll, C.; Haldar, R.; Jakoby, M.; Kozlowska, M.; Khan, M. R.; Chen, H.; Pramudya, Y.; Richards, B. S.; Heinke, L.; Wenzel, W.; Odobel, F.; Diring, S.; Howard, I. A.; Lemmer, U.
2020. Chemistry - a European journal, 26 (71), 17016–17020. doi:10.1002/chem.202003712
A fully planar solar pumped laser based on a luminescent solar collector
Masuda, T.; Iyoda, M.; Yasumatsu, Y.; Dottermusch, S.; Howard, I. A.; Richards, B. S.; Bisson, J.-F.; Endo, M.
2020. Communications Physics, 3 (1), Article No. 60. doi:10.1038/s42005-020-0326-2
Crystalline assembly of perylene in metal–organic framework thin film: J-aggregate or excimer? Insight into the electronic structure
Kozlowska, M.; Pramudya, Y.; Jakoby, M.; Heidrich, S.; Pan, L.; Richards, B.; Howard, I.; Woell, C.; Haldar, R.; Wenzel, W.
2020. Journal of physics / Condensed matter, 33 (3), Art.Nr. 034001. doi:10.1088/1361-648X/abbc34
Phonon density of states in lanthanide-based nanocrystals
Li, Z. H.; Hudry, D.; Heid, R.; Said, A. H.; Le, M. D.; Popescu, R.; Gerthsen, D.; Merz, M.; Krämer, K. W.; Busko, D.; Howard, I. A.; Richards, B. S.; Weber, F.
2020. Physical review / B, 102 (16), Art.-Nr.: 165409. doi:10.1103/PhysRevB.102.165409
Inorganic fluorescent marker materials for identification of post-consumer plastic packaging
Woidasky, J.; Sander, I.; Schau, A.; Moesslein, J.; Wendler, P.; Wacker, D.; Gao, G.; Kirchenbauer, D.; Kumar, V.; Busko, D.; Howard, I. A.; Richards, B. S.; Turshatov, A.; Wiethoff, S.; Lang-Koetz, C.
2020. Resources, conservation and recycling, 161, Article no: 104976. doi:10.1016/j.resconrec.2020.104976
Spontaneous Enhancement of the Power Output in Surface-Passivated Triple-Cation Perovskite Solar Cells
Moghadamzadeh, S.; Gharibzadeh, S.; Jakoby, M.; Khan, M. R.; Haghighirad, A. A.; Howard, I. A.; Richards, B. S.; Lemmer, U.; Paetzold, U. W.
2020. 2020 47th IEEE Photovoltaic Specialists Conference (PVSC), 15 June - 21 August 2020, online, 1217–1219, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/PVSC45281.2020.9300632
Solar powered fiber laser for energy conversion applications
Masuda, T.; Dottermusch, S.; Howard, I. A.; Richards, B. S.; Bisson, J.; Endo, M.
2020. CLEO: Applications and Technology : part of CLEO: 2020 : 10-15 May 2020, Washington, DC, United States, Art.Nr. AF3N.4, Optica Publishing Group (OSA). doi:10.1364/CLEO_AT.2020.AF3N.4
Guest-responsive polaritons in a porous framework: chromophoric sponges in optical QED cavities
Haldar, R.; Fu, Z.; Joseph, R.; Herrero, D.; Martín-Gomis, L.; Richards, B. S.; Howard, I. A.; Sastre-Santos, A.; Wöll, C.
2020. Chemical science, 11 (30), 7972–7978. doi:10.1039/d0sc02436h
Correction: Guest-responsive polaritons in a porous framework: chromophoric sponges in optical QED cavities
Haldar, R.; Fu, Z.; Joseph, R.; Herrero, D.; Martín-Gomis, L.; Richards, B. S.; Howard, I. A.; Sastre-Santos, Á.; Wöll, C.
2020. Chemical science, 11 (32), 8626. doi:10.1039/d0sc90163f
Smartphone‐Based Luminescent Thermometry via Temperature‐Sensitive Delayed Fluorescence from GdOS:Eu
Katumo, N.; Gao, G.; Laufer, F.; Richards, B. S.; Howard, I. A.
2020. Advanced optical materials, 8 (19), Art.Nr. 2000507. doi:10.1002/adom.202000507
Sensitizing TADF Absorption Using Variable Length Oligo(phenylene ethynylene) Antennae
Franco, O.; Jakoby, M.; Schneider, R. V.; Hundemer, F.; Hahn, D.; Richards, B. S.; Bräse, S.; Meier, M. A. R.; Lemmer, U.; Howard, I. A.
2020. Frontiers in Chemistry, 8, Art.-Nr.: 126. doi:10.3389/fchem.2020.00126
Lanthanide Sensitizers for Large Anti-Stokes Shift Near-Infrared-to-Visible Triplet–Triplet Annihilation Photon Upconversion
Kiseleva, N.; Nazari, P.; Dee, C.; Busko, D.; Richards, B. S.; Seitz, M.; Howard, I. A.; Turshatov, A.
2020. The journal of physical chemistry letters, 11, 2477–2481. doi:10.1021/acs.jpclett.0c00221
Upconversion properties of SrF₂:Yb³⁺,Er³⁺ single crystals
Saleta Reig, D.; Grauel, B.; Konyushkin, V. A.; Fedorov, P. P.; Busko, D.; Howard, I. A.; Richards, B. S.; Resch-Genger, U.; Kuznetsov, S.; Turshatov, A.; Würth, C.
2020. Journal of materials chemistry / C, 8 (12), 4093–4101. doi:10.1039/C9TC06591A
Improved photon absorption in dye-functionalized silicon nanocrystals synthesized via microwave-assisted hydrosilylation
Beri, D.; Jakoby, M.; Howard, I. A.; Busko, D.; Richards, B. S.; Turshatov, A.
2020. Dalton transactions, 49 (7), 2290–2299. doi:10.1039/C9DT04497C
High-brightness Perovskite Light-emitting Diodes Using a Printable Silver Microflake Contact
Payandeh, M.; Ahmadi, V.; Arabpour Roghabadi, F.; Nazari, P.; Ansari, F.; Brenner, P.; Baeuerle, R.; jakoby, marius; Lemmer, U.; Howard, I. A.; Richards, B. S.; Paetzold, U. W.; Abdollahi Nejand, B.
2020. ACS applied materials & interfaces, 12 (10), 11428–11437. doi:10.1021/acsami.9b18527
Solution-processed and evaporated C interlayers for improved charge transport in perovskite photovoltaics
Rueda-Delgado, D.; Hossain, I. M.; Jakoby, M.; Schwenzer, J. A.; Abzieher, T.; Howard, I. A.; Richards, B. S.; Lemmer, U.; Paetzold, U. W.
2020. Organic electronics, 77, Article: 105526. doi:10.1016/j.orgel.2019.105526
Vacuum‐Assisted Growth of Low‐Bandgap Thin Films (FAMASnPbI) for All‐Perovskite Tandem Solar Cells
Abdollahi Nejand, B.; Hossain, I. M.; Jakoby, M.; Moghadamzadeh, S.; Abzieher, T.; Gharibzadeh, S.; Schwenzer, J. A.; Nazari, P.; Schackmar, F.; Hauschild, D.; Weinhardt, L.; Lemmer, U.; Richards, B. S.; Howard, I. A.; Paetzold, U. W.
2020. Advanced energy materials, 10 (5), Article: 1902583. doi:10.1002/aenm.201902583
2019
A de novo strategy for predictive crystal engineering to tune excitonic coupling
Haldar, R.; Mazel, A.; Krstić, M.; Zhang, Q.; Jakoby, M.; Howard, I. A.; Richards, B. S.; Jung, N.; Jacquemin, D.; Diring, S.; Wenzel, W.; Odobel, F.; Wöll, C.
2019. Nature Communications, 10 (1), Art.Nr. 2048. doi:10.1038/s41467-019-10011-8
Comment on “Room-Temperature Continuous-Wave Operation of Organometal Halide Perovskite Lasers”
Brenner, P.; Paetzold, U. W.; Turnbull, G. A.; Giebink, N. C.; Samuel, I. D. W.; Lemmer, U.; Howard, I. A.
2019. ACS nano, 13 (11), 12257–12258. doi:10.1021/acsnano.9b00133
Coated and Printed Perovskites for Photovoltaic Applications
Howard, I. A.; Abzieher, T.; Hossain, I. M.; Eggers, H.; Schackmar, F.; Ternes, S.; Richards, B. S.; Lemmer, U.; Paetzold, U. W.
2019. Advanced materials, 31 (26), Art.Nr. 1806702. doi:10.1002/adma.201806702
Structure–Property Relationships in Lanthanide‐Doped Upconverting Nanocrystals: Recent Advances in Understanding Core–Shell Structures
Hudry, D.; Howard, I. A.; Popescu, R.; Gerthsen, D.; Richards, B. S.
2019. Advanced materials, 31 (26), Art.Nr. 1900623. doi:10.1002/adma.201900623
Perovskite Solar Cells: Record Open‐Circuit Voltage Wide‐Bandgap Perovskite Solar Cells Utilizing 2D/3D Perovskite Heterostructure
Gharibzadeh, S.; Abdollahi Nejand, B.; Jakoby, M.; Abzieher, T.; Hauschild, D.; Moghadamzadeh, S.; Schwenzer, J. A.; Brenner, P.; Schmager, R.; Haghighirad, A. A.; Weinhardt, L.; Lemmer, U.; Richards, B. S.; Howard, I. A.; Paetzold, U. W.
2019. Advanced energy materials, 9 (21), 1970079. doi:10.1002/aenm.201970079
Continuous wave amplified spontaneous emission in phase-stable lead halide perovskites
Brenner, P.; Bar-On, O.; Jakoby, M.; Allegro, I.; Richards, B. S.; Paetzold, U. W.; Howard, I. A.; Scheuer, J.; Lemmer, U.
2019. Nature Communications, 10 (1), Article-Nr.: 988. doi:10.1038/s41467-019-08929-0
Continuous wave amplified spontaneous emission in phase-stable triple cation lead halide perovskite thin films
Allegro, I.; Brenner, P.; Bar-On, O.; Jakoby, M.; Richards, B. S.; Paetzold, U. W.; Howard, I. A.; Scheuer, J.; Lemmer, U.
2019. 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC): Munich, International Congress Centre (ICM), Germany, 23-27 June 2019, Institute of Electrical and Electronics Engineers (IEEE). doi:10.1109/CLEOE-EQEC.2019.8871688
Spontaneous Enhancement of the Stable Power Conversion Efficiency in Perovskite Solar Cells
Moghadamzadeh, S.; Hossain, I.; Jakoby, M.; Abdollahi Nejand, B.; Rueda-Delgado, D.; Schwenzer, J. A.; Gharibzadeh, S.; Abzieher, T.; Khan, M. R.; Haghighirad, A. A.; Howard, I. A.; Richards, B. S.; Lemmer, U.; Paetzold, U. W.
2019. Journal of materials chemistry / A, 8 (2), 670–682. doi:10.1039/C9TA09584E
Critical Power Density: A Metric to Compare the Excitation Power Density Dependence of Photon Upconversion in Different Inorganic Host Materials
Joseph, R. E.; Jiménez, C.; Hudry, D.; Gao, G.; Busko, D.; Biner, D.; Turshatov, A.; Krämer, K.; Richards, B. S.; Howard, I. A.
2019. The journal of physical chemistry <Washington, DC> / A, 123 (31), 6799–6811. doi:10.1021/acs.jpca.9b03851
Continuous Wave Amplified Spontaneous Emission from Mixed Cation Perovskite devices
Brenner, P.; Bar-On, O.; Jakoby, M.; Allegro, I.; Richards, B. S.; Paetzold, U. W.; Howard, I. A.; Scheuer, J.; Lemmer, U.
2019. Conference on Lasers and Electro-Optics, JTu2A.71, Optica Publishing Group (OSA). doi:10.1364/CLEO_AT.2019.JTu2A.71
An enhanced energy migration strategy in upconverting nanocrystals: Color-tuning with high quantum yield
Hudry, D.; Busko, D.; Popescu, R.; Gerthsen, D.; Howard, I. A.; Richards, B. S.
2019. Journal of materials chemistry / C, 7 (24), 7371–7377. doi:10.1039/c9tc01567a
Synthesis of dipolar molecular rotors as linkers for metal-organic frameworks
Hamer, S.; Röhricht, F.; Jakoby, M.; Howard, I. A.; Zhang, X.; Näther, C.; Herges, R.
2019. Beilstein journal of organic chemistry, 15, 1331–1338. doi:10.3762/bjoc.15.132
Highly Efficient One-Dimensional Triplet Exciton Transport in a Palladium-Porphyrin-Based Surface-Anchored Metal-Organic Framework
Adams, M.; Kozlowska, M.; Baroni, N.; Oldenburg, M.; Ma, R.; Busko, D.; Turshatov, A.; Emandi, G.; Senge, M. O.; Haldar, R.; Wöll, C.; Nienhaus, G. U.; Richards, B. S.; Howard, I. A.
2019. ACS applied materials & interfaces, 11 (17), 15688–15697. doi:10.1021/acsami.9b03079
Record Open‐Circuit Voltage Wide‐Bandgap Perovskite Solar Cells Utilizing 2D/3D Perovskite Heterostructure
Gharibzadeh, S.; Abdollahi Nejand, B.; Jakoby, M.; Abzieher, T.; Hauschild, D.; Moghadamzadeh, S.; Schwenzer, J. A.; Brenner, P.; Schmager, R.; Haghighirad, A. A.; Weinhardt, L.; Lemmer, U.; Richards, B. S.; Howard, I. A.; Paetzold, U. W.
2019. Advanced energy materials, 9 (21), Article: 1803699. doi:10.1002/aenm.201803699
High Quantum Yield Single-Band Green Upconversion in La₂O₃:Yb³⁺, Ho³⁺ Microcrystals for Anticounterfeiting and Plastic Recycling
Gao, G.; Busko, D.; Joseph, R.; Turshatov, A.; Howard, I. A.; Richards, B. S.
2019. Particle & Particle Systems Characterization, 36 (3), Art.-Nr.: 1800462. doi:10.1002/ppsc.201800462
2018
Anisotropic energy transfer in crystalline chromophore assemblies
Haldar, R.; Jakoby, M.; Mazel, A.; Zhang, Q.; Welle, A.; Mohamed, T.; Krolla, P.; Wenzel, W.; Diring, S.; Odobel, F.; Richards, B. S.; Howard, I. A.; Wöll, C.
2018. Nature Communications, 9 (1), Art.Nr. 4332. doi:10.1038/s41467-018-06829-3
Probing the pathways of free charge generation in organic bulk heterojunction solar cells
Kurpiers, J.; Ferron, T.; Roland, S.; Jakoby, M.; Thiede, T.; Jaiser, F.; Albrecht, S.; Janietz, S.; Collins, B. A.; Howard, I. A.; Neher, D.
2018. Nature Communications, 9 (1), Article no 2038. doi:10.1038/s41467-018-04386-3
Highly Efficient La₂O₃:Yb³⁺,Tm³⁺ Single-Band NIR-to-NIR Upconverting Microcrystals for Anti-Counterfeiting Applications
Gao, G.; Busko, D.; Joseph, R.; Howard, I. A.; Turshatov, A.; Richards, B. S.
2018. ACS applied materials & interfaces, 10 (46), 39851–39859. doi:10.1021/acsami.8b11196
Inkjet-Printed Photoluminescent Patterns of Aggregation-Induced-Emission Chromophores on Surface-Anchored Metal–Organic Frameworks
Baroni, N.; Turshatov, A.; Adams, M.; Dolgopolova, E. A.; Schlisske, S.; Hernandez-Sosa, G.; Wöll, C.; Shustova, N. B.; Richards, B. S.; Howard, I. A.
2018. ACS applied materials & interfaces, 10 (30), 25754–25762. doi:10.1021/acsami.8b05568
A method for correcting the excitation power density dependence of upconversion emission due to laser-induced heating
Joseph, R. E.; Busko, D.; Hudry, D.; Gao, G.; Biner, D.; Krämer, K.; Turshatov, A.; Richards, B. S.; Howard, I. A.
2018. Optical materials, 82, 65–70. doi:10.1016/j.optmat.2018.05.025
Interface disorder in large single- and multi-shell upconverting nanocrystals
Hudry, D.; Popescu, R.; Busko, D.; Diaz-Lopez, M.; Abeykoon, M.; Bordet, P.; Gerthsen, D.; Howard, I. A.; Richards, B. S.
2018. Journal of materials chemistry / C, 2019 (7), 1164–1172. doi:10.1039/C8TC05130E
A Novel Route to Plastics Recycling via Unique, Background-free, Micro-scale Photonic Markers
Richards, B. S.; Busko, D.; Gao, G.; Hudry, D.; Howard, I. A.; Turshatov, A.
2018. Optics and Photonics for Energy and the Environment, Singapore, 5–8 November 2018, EM2A.4, Optica Publishing Group (OSA). doi:10.1364/EE.2018.EM2A.4
Reaction of porphyrin-based surface-anchored metal-organic frameworks to prolonged illumination
Adams, M.; Baroni, N.; Oldenburg, M.; Kraffert, F.; Behrends, J.; MacQueen, R. W.; Haldar, R.; Busko, D.; Turshatov, A.; Emandi, G.; Senge, M. O.; Wöll, C.; Lips, K.; Richards, B. S.; Howard, I. A.
2018. Physical chemistry, chemical physics, 46, 29142–29151. doi:10.1039/C8CP05254A
Absolute upconversion quantum yields of blue-emitting LiYF4:Yb3+,Tm3+ upconverting nanoparticles
Meijer, M. S.; Rojas-Gutierrez, P. A.; Busko, D.; Howard, I. A.; Frenzel, F.; Würth, C.; Resch-Genger, U.; Richards, B. S.; Turshatov, A.; Capobianco, J. A.; Bonnet, S.
2018. Physical chemistry, chemical physics, 20, 22556–22562. doi:10.1039/C8CP03935F
Up-conversion quantum yields of SrF2:Yb3+,Er3+ sub-micron particles prepared by precipitation from aqueous solution
Kuznetsov, S.; Ermakova, Y.; Voronov, V.; Fedorov, P.; Busko, D.; Howard, I. A.; Richards, B. S.; Turshatov, A.
2018. Journal of materials chemistry / C, 6 (3), 598–604. doi:10.1039/C7TC04913G
Enhancing the photoluminescence of surface anchored metal–organic frameworks: mixed linkers and efficient acceptors
Oldenburg, M.; Turshatov, A.; Busko, D.; Jakoby, M.; Haldar, R.; Chen, K.; Emandi, G.; Senge, M. O.; Wöll, C.; Hodgkiss, J. M.; Richards, B. S.; Howard, I. A.
2018. Physical chemistry, chemical physics, 20 (17), 11564–11576. doi:10.1039/C7CP08452H
Wide-range non-contact fluorescence intensity ratio thermometer based on Yb³⁺/Nd³⁺ co-doped La₂O₃ microcrystals operating from 290 to 1230 K
Gao, G.; Busko, D.; Kauffmann-Weiss, S.; Turshatov, A.; Howard, I. A.; Richards, B. S.
2018. Journal of materials chemistry / C, 6 (15), 4163–4170. doi:10.1039/C8TC00782A
Highly photoluminescent and stable silicon nanocrystals functionalized via microwave-assisted hydrosilylation
Beri, D.; Busko, D.; Mazilkin, A.; Howard, I. A.; Richards, B. S.; Turshatov, A.
2018. RSC Advances, 8 (18), 9979–9984. doi:10.1039/C7RA13577G
The Janus-faced chromophore : A donor-acceptor dyad with dual performance in photon up-conversion
Kiseleva, N.; Filatov, M. A.; Oldenburg, M.; Busko, D.; Jakoby, M.; Howard, I. A.; Richards, B. S.; Senge, M. O.; Borisov, S. M.; Turshatov, A.
2018. Chemical communications, 54 (13), 1607–1610. doi:10.1039/c7cc08930a
Inkjet-printed perovskite distributed feedback lasers
Mathies, F.; Brenner, P.; Hernandez-Sosa, G.; Howard, I. A.; Paetzold, U. W.; Lemmer, U.
2018. Optics express, 26 (2), A144 - A152. doi:10.1364/OE.26.00A144
2017
N-Heteroacenes as a New Class of Non-Fullerene Electron Acceptors for Organic Bulk-Heterojunction Photovoltaic Devices
Lami, V.; Leibold, D.; Fassl, P.; Hofstetter, Y. J.; Becker-Koch, D.; Biegger, P.; Paulus, F.; Hopkinson, P. E.; Adams, M.; Bunz, U. H. F.; Huettner, S.; Howard, I.; Bakulin, A. A.; Vaynzof, Y.
2017. Solar RRL, 1 (6), Art.Nr. 1700053. doi:10.1002/solr.201700053
Scalable and low cost fabrication methods for wavelength tunable solution processed perovskite distributed feedback lasers
Brenner, P.; Mathies, F.; Kapp, D.; Paetzold, U.; Quintilla, A.; Hernandez-Sosa, G.; Howard, I.; Lemmer, U.
2017. Proceedings of the European Conference on Lasers and Electro-Optics 2017, Munich, Germany, 25th - 29th June 2017, Art.Nr. JSV_3_2, Optica Publishing Group (OSA)
Relating Structure to Efficiency in Surfactant-Free Polymer/Fullerene Nanoparticle-Based Organic Solar Cells
Gärtner, S.; Clulow, A. J.; Howard, I. A.; Gilbert, E. P.; Burn, P. L.; Gentle, I. R.; Colsmann, A.
2017. ACS applied materials & interfaces, 9 (49), 42986–42995. doi:10.1021/acsami.7b15601
Finely-tuned NIR-to-visible up-conversion in La2O3:Yb3+,Er3+ microcrystals with high quantum yield
Gao, G.; Busko, D.; Kauffmann-Weiss, S.; Turshatov, A.; Howard, I. A.; Richards, B. S.
2017. Journal of materials chemistry / C, 5 (42), 11010–11017. doi:10.1039/C6TC05322J
Triple cation mixed-halide perovskites for tunable lasers
Brenner, P.; Glöckler, T.; Rueda-Delgado, D.; Abzieher, T.; Jakoby, M.; Richards, B. S.; Paetzold, U. W.; Howard, I. A.; Lemmer, U.
2017. Optical materials express, 7 (11), 4082–4094. doi:10.1364/OME.7.004082
Excitonically Coupled States in Crystalline Coordination Networks
Haldar, R.; Mazel, A.; Joseph, R.; Adams, M.; Howard, I. A.; Richards, B. S.; Tsotsalas, M.; Redel, E.; Diring, S.; Odobel, F.; Wöll, C.
2017. Chemistry - a European journal, 23 (57), 14316–14322. doi:10.1002/chem.201702968
Facile loading of thin-film surface-anchored metal-organic frameworks with Lewis-base guest molecules
Baroni, N.; Turshatov, A.; Oldenburg, M.; Busko, D.; Adams, M.; Haldar, R.; Welle, A.; Redel, E.; Wöll, C.; Richards, B. S.; Howard, I. A.
2017. Materials chemistry frontiers, 1 (9), 1888–1894. doi:10.1039/C7QM00142H
Up-Conversion Fluorescent Labels for Plastic Recycling: A Review
Gao, G.; Turshatov, A.; Howard, I. A.; Busko, D.; Joseph, R.; Hudry, D.; Richards, B. S.
2017. Advanced Sustainable Systems, 1 (5), Art.Nr. 1600033. doi:10.1002/adsu.201600033
Identifying Charge-Transfer States in Polymer:Fullerene Heterojunctions by Their Emission Polarization Anisotropy
Arndt, A. P.; Gerhard, M.; Koch, M.; Lemmer, U.; Howard, I. A.
2017. The journal of physical chemistry <Washington, DC> / C, 121 (11), 6357–6364. doi:10.1021/acs.jpcc.6b12853
Field-induced exciton dissociation in PTB7-based organic solar cells
Gerhard, M.; Arndt, A. P.; Bilal, M.; Lemmer, U.; Koch, M.; Howard, I. A.
2017. Physical review / B, 95 (19), Art.Nr. 195301. doi:10.1103/PhysRevB.95.195301
Room-Temperature High-Efficiency Solid-State Triplet-Triplet Annihilation Up-Conversion in Amorphous Poly(olefin sulfone)s
Turshatov, A.; Busko, D.; Kiseleva, N.; Grage, S. L.; Howard, I. A.; Richards, B. S.
2017. ACS applied materials & interfaces, 9 (9), 8280–8286. doi:10.1021/acsami.6b12625
2016
Bragg Stacks Enhancing Upconversion for Photovoltaics: A Theoretical And Experimental Analysis
Hofmann, C. L.; Fischer, S.; Reitz, C.; Mondon, A.; Busko, D.; Howard, I.; Richards, B. S.; Goldschmidt, J. C.
2016. Light, Energy and the Environment Congress, November 14-17, 2016, Leipzig, Germany, PTh4A.5, Optica Publishing Group (OSA). doi:10.1364/PV.2016.PTh4A.5
Highly stable solution processed metal-halide perovskite lasers on nanoimprinted distributed feedback structures
Brenner, P.; Stulz, M.; Kapp, D.; Abzieher, T.; Paetzold, U. W.; Quintilla, A.; Howard, I. A.; Kalt, H.; Lemmer, U.
2016. Applied physics letters, 109 (14), 141106. doi:10.1063/1.4963893
Photon Upconversion at Crystalline Organic-Organic Heterojunctions
Oldenburg, M.; Turshatov, A.; Busko, D.; Wollgarten, S.; Adams, M.; Baroni, N.; Welle, A.; Redel, E.; Wöll, C.; Richards, B. S.; Howard, I. A.
2016. Advanced materials, 28 (38), 8477–8482. doi:10.1002/adma.201601718
Electronic transfer across crystalline thin-film surface anchored metal-organic framework (SURMOF) heterojunctions
Oldenburg, M.; Howard, I. A.; Turshatov, A.; Baroni, N.; Wollgarten, S.; Redel, E.; Wöll, C.; Richards, B. S.
2016. SPIE Photonics Europe, Brussels, B, 3.-7. April 2016
Active heterostructure of crystalline thin-film surface anchored metal-organic frameworks for optoelectronic applications
Oldenburg, M.; Howard, I. A.; Turshatov, A.; Baroni, N.; Wollgarten, S.; Redel, E.; Wöll, C.
2016. 80. Jahrestagung der DPG und DPG-Frühjahrstagung der Sektion Kondensierte Materie, Fachverband Chemische Physik und Polymerphysik, Regensburg, 6.-11.März 2016. Verhandlungen der Deutschen Physikalischen Gesellschaft, R.6, B.51(2016) CPP32.9, H37
Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence
Gerhard, M.; Gehring, D.; Howard, I. A.; Arndt, A. P.; Bilal, M.; Rahimi-Iman, A.; Lemmer, U.; Laquai, F.; Koch, M.
2016. Organic Photonics VII. Ed.: D. Cheyns, 98950H, Society of Photo-optical Instrumentation Engineers (SPIE). doi:10.1117/12.2227672
2015
Temperature- and energy-dependent separation of charge-transfer states in PTB7-based organic solar cells
Gerhard, M.; Arndt, A. P.; Howard, I. A.; Rahimi-Iman, A.; Lemmer, U.; Koch, M.
2015. The journal of physical chemistry <Washington, DC> / C, 119 (51), 28309–28318. doi:10.1021/acs.jpcc.5b09842
Photoinduzierte Erzeugung von Ladungsträgern in epitaktischen MOF-Dünnschichten: hohe Leistung aufgrund einer indirekten elektronischen Bandlücke?
Liu, J.; Zhou, W.; Liu, J.; Howard, I.; Kilibarda, G.; Schlabach, S.; Coupry, D.; Addicoat, M.; Yoneda, S.; Tsutsui, Y.; Sakurai, T.; Seki, S.; Wang, Z.; Lindemann, P.; Redel, E.; Heine, T.; Wöll, C.
2015. Angewandte Chemie, 127, 7549–7553. doi:10.1002/ange.201501862
Photoinduced charge-carrier generation in epitaxial MOF thin films: High efficiency as a result of an indirect electronic band gap?
Liu, J.; Zhou, W.; Liu, J.; Howard, I.; Kilibarda, G.; Schlabach, S.; Coupry, D.; Addicoat, M.; Yoneda, S.; Tsutsui, Y.; Sakurai, T.; Seki, S.; Wang, Z.; Lindemann, P.; Redel, E.; Heine, T.; Wöll, C.
2015. Angewandte Chemie / International edition, 54 (25), 7441–7445. doi:10.1002/anie.201501862
The impact of donor-acceptor phase separation on the charge carrier dynamics in pBTTT:PCBM photovoltaic blends
Gehrig, D. W.; Howard, I. A.; Sweetnam, S.; Burke, T. M.; McGehee, M.; Laquai, F.
2015. Macromolecular rapid communications, 36 (11), 1054–1060. doi:10.1002/marc.201500112
Time-resolved charge-transfer state emission in organic solar cells : Temperature and blend composition dependences of interfacial traps
Arndt, A. P.; Gerhard, M.; Quintilla, A.; Howard, I. A.; Koch, M. W.; Lemmer, U.
2015. The journal of physical chemistry <Washington, DC> / C, 119 (24), 13516–13523. doi:10.1021/acs.jpcc.5b03507
2014
Control of charge generation and recombination in ternary polymer/polymer:fullerene photovoltaic blends using amorphous and semi-crystalline copolymers as donors
Mangold, H.; Bakulin, A. A.; Howard, I. A.; Kästner, C.; Egbe, D. A. M.; Hoppe, H.; Laquai, F.
2014. Physical chemistry, chemical physics, 16, 20329–20337. doi:10.1039/C4CP01883D