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Efficient and bright white light-emitting diodes based on single-layer heterophase halide perovskites

Journal Article · · Nature Photonics
 [1];  [2];  [3];  [3];  [3];  [4];  [4];  [3];  [3];  [2];  [2];  [3]
  1. MIIT Key Lab. of Advanced Display Materials and Devices, Nanjing (China); Nanjing Univ. of Science and Technology (China); University of Washington
  2. Univ. of Washington, Seattle, WA (United States)
  3. MIIT Key Lab. of Advanced Display Materials and Devices, Nanjing (China); Nanjing Univ. of Science and Technology (China)
  4. Nanjing Univ. of Science and Technology (China)
At present, electric lighting accounts for ~15% of global power consumption and thus the adoption of efficient, low-cost lighting technologies is important. Here, halide perovskites have been shown to be good emitters of pure red, green and blue light, but an efficient source of broadband white electroluminescence suitable for lighting applications is desirable. Here, we report a white light-emitting diode (LED) strategy based on solution-processed heterophase halide perovskites that, unlike GaN white LEDs, feature only one broadband emissive layer and no phosphor. Our LEDs operate with a peak luminance of 12,200 cd m–2 at a bias of 6.6 V and a maximum external quantum efficiency of 6.5% at a current density of 8.3 mA cm–2. Systematic in situ and ex situ characterizations reveal that the mechanism of efficient electroluminescence is charge injection into the α phase of CsPbI3, α to δ charge transfer and α–δ balanced radiative recombination. Future advances in fabrication technology and mechanistic understanding should lead to further improvements in device efficiency and luminance.
Research Organization:
Univ. of Washington, Seattle, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; SC0013957
OSTI ID:
1779465
Journal Information:
Nature Photonics, Journal Name: Nature Photonics Journal Issue: 3 Vol. 15; ISSN 1749-4885
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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