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

Journal Article · · Nature (London)
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  1. Huazhong Univ. of Science and Technology (HUST), Wuhan (China)
  2. Univ. of Toledo, OH (United States)
  3. Monash Univ., Melbourne, VIC (Australia)
  4. Jilin Univ., Changchun (China). State Key Lab. of Superhard Materials
  5. Huazhong Univ. of Science and Technology (HUST), Wuhan (China); Univ. of Toronto, ON (Canada)
  6. Tsinghua Univ., Beijing (China)
  7. Chinese Academy of Sciences, Dalian (China)
  8. Wuhan Univ. (China)
  9. Univ. of Toronto, ON (Canada)
Lighting accounts for one-fifth of global electricity consumption. 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; 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 semiconductor. This leads to an increase in photoluminescence efficiency by three orders of magnitude compared to pure Cs2AgInCl6. The optimally alloyed Cs2(Ag0.60Na0.40)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.
Research Organization:
Duke Univ., Durham, NC (United States); Energy Frontier Research Centers (EFRC) (United States). Center for Hybrid Organic-Inorganic Semiconductors for Energy (CHOISE); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; EE0006712
OSTI ID:
1543773
Journal Information:
Nature (London), Journal Name: Nature (London) Journal Issue: 7732 Vol. 563; ISSN 0028-0836
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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