Mixed Halide Perovskites for Spectrally Stable and High-Efficiency Blue Light-Emitting Diodes

Max Karlsson^a, Ziyue Yi^a^,^b, Sebastian Reichert^c, Xiyu Luo^a^,^d, Weihua Lin^e, Zeyu Zhang^f, Chunxiong Bao^a, Rui Zhang^a, Sai Bai^a, Pengpeng Teng^a, Lian Duan^d, Yue Lu^f, Kaibo Zheng^e^,^g, Tönu Pullerits^e, Carsten Deibel^c, Weidong Xu^a, Richard Friend^b, Feng Gao^a

^aDepartment of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden

^bCavendish Laboratory, University of Cambridge, Cambridge, UK

^cInstitut für Physik, Technische Universität Chemnitz, Reichenhainer Straße, 70, Chemnitz, Germany

^dKey Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University Beijing, China, Zhong Guan Cun Bei Da Jie, Beijing, China

^eChemical Physics and NanoLund, Lund University, Lund, Sweden., Naturvetarvägen, 16, Sweden

^fInstitute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Distrito de Chaoyang, Beijing, China

^gDepartment of Chemistry, Technical University of Denmark, Kemitorvet, Building 207, Lyngby, Denmark

International Conference on Hybrid and Organic Photovoltaics
Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)

Online, Spain, 2021 May 24th - 28th

Organizers: Marina Freitag, Feng Gao and Sam Stranks

Oral, Max Karlsson, presentation 081
Publication date: 11th May 2021

Bright and efficient blue emission is key to further development of metal halide perovskite light-emitting diodes. Although modifying the bromide/chloride composition is the most straightforward process to achieve blue emission, practical implementation of this strategy has been challenging due to poor colour stability and severe photoluminescence quenching. Both detrimental effects become increasingly prominent in perovskites with the high chloride content needed to produce blue emission.

Here, we demonstrate a correlation between spectral instability and compositional heterogeneity in the perovskite films. We provide a vapor-assisted crystallization technique which largely mitigates ion migration by compositional homogenization and show spectrally stable blue perovskite light-emitting diodes over a wide range of emission wavelengths from 490 to 451 nanometres.Particularly, our blue and deep-blue light-emitting diodes based on three-dimensional perovskites show high EQE values of 11.0% and 5.5% with emission peaks at 477 and 467 nm, respectively.

Beyond that, stabilized mixed halide perovskites are of great interest for a wide range of perovskite applications where the bandgap needs to be finely controlled, for instance, in tandem solar cells, photo detectors and lasing.

Acknowledgements:

We acknowledge the support from the ERC Starting Grant (No. 717026), the Swedish Energy Agency Energimyndigheten (No. 48758-1 and 44651-1), Swedish Research Council VR, NanoLund and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009-00971). C.D. and S.R. acknowledge financial support by the Bundesministerium für Bildung und Forschung (BMBF Hyper project, contract no. 03SF0514C) and the DFG (no. DE 830/22-1) within the framework of SPP 2196 programme. Y. L. acknowledge financial support from the National Key Research and Development Program of China (2016YFB0700700), the National Natural Science Foundation of China (11704015, 51621003, 12074016), the Scientific Research Key Program of Beijing Municipal Commission of Education, China (KZ201310005002), and the Beijing Innovation Team Building Program, China (IDHT20190503). F.G. is a Wallenberg Academy Fellow.

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