Efficient and stable emission of warm-white light from lead-free halide double perovskites

Jiajun Luo; Xiaoming Wang; Shunran Li; Jing Liu; Yueming Guo; Guangda Niu; Li Yao; Yuhao Fu; Liang Gao; Qingshun Dong; Chunyi Zhao; Meiying Leng; Fusheng Ma; Wenxi Liang; Liduo Wang; Shengye Jin; Junbo Han; Lijun Zhang; Joanne Etheridge; Jianbo Wang; Yanfa Yan; Edward H Sargent; Jiang Tang

doi:10.1038/s41586-018-0691-0

Efficient and stable emission of warm-white light from lead-free halide double perovskites

Nature. 2018 Nov;563(7732):541-545. doi: 10.1038/s41586-018-0691-0. Epub 2018 Nov 7.

Authors

Jiajun Luo¹, Xiaoming Wang², Shunran Li¹, Jing Liu¹, Yueming Guo³, Guangda Niu¹, Li Yao¹, Yuhao Fu⁴, Liang Gao^{1

5}, Qingshun Dong⁶, Chunyi Zhao⁷, Meiying Leng¹, Fusheng Ma⁶, Wenxi Liang¹, Liduo Wang⁶, Shengye Jin⁷, Junbo Han⁸, Lijun Zhang⁴, Joanne Etheridge^{3

9}, Jianbo Wang¹⁰, Yanfa Yan¹¹, Edward H Sargent⁵, Jiang Tang¹²

Affiliations

¹ Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan, China.
² Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, OH, USA.
³ Department of Materials Science and Engineering, Monash University, Clayton, Victoria, Australia.
⁴ State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE, and School of Materials Science and Engineering, Jilin University, Changchun, China.
⁵ Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, Canada.
⁶ Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing, China.
⁷ State Key Laboratory of Molecular Reaction Dynamics and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
⁸ Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology (HUST), Wuhan, China.
⁹ Monash Centre for Electron Microscopy, Monash University, Clayton, Victoria, Australia.
¹⁰ School of Physics and Technology, Center for Electron Microscopy, MOE Key Laboratory of Artificial Micro- and Nano-structures, and Institute for Advanced Studies, Wuhan University, Wuhan, China.
¹¹ Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo, Toledo, OH, USA. yanfa.yan@utoledo.edu.
¹² Sargent Joint Research Center, Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology (HUST), Wuhan, China. jtang@mail.hust.edu.cn.

PMID: 30405238
DOI: 10.1038/s41586-018-0691-0

Abstract

Lighting accounts for one-fifth of global electricity consumption¹. Single materials with efficient and stable white-light emission are ideal for lighting applications, but photon emission covering the entire visible spectrum is difficult to achieve using a single material. Metal halide perovskites have outstanding emission properties^2,3; however, the best-performing materials of this type contain lead and have unsatisfactory stability. Here we report a lead-free double perovskite that exhibits efficient and stable white-light emission via self-trapped excitons that originate from the Jahn-Teller distortion of the AgCl₆ octahedron in the excited state. By alloying sodium cations into Cs₂AgInCl₆, we break the dark transition (the inversion-symmetry-induced parity-forbidden transition) by manipulating the parity of the wavefunction of the self-trapped exciton and reduce the electronic dimensionality of the semiconductor⁴. This leads to an increase in photoluminescence efficiency by three orders of magnitude compared to pure Cs₂AgInCl₆. The optimally alloyed Cs₂(Ag_0.60Na_0.40)InCl₆ with 0.04 per cent bismuth doping emits warm-white light with 86 ± 5 per cent quantum efficiency and works for over 1,000 hours. We anticipate that these results will stimulate research on single-emitter-based white-light-emitting phosphors and diodes for next-generation lighting and display technologies.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.

Abstract

Publication types

Grants and funding