Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 7, Pages 2802-2807Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201910180
Keywords
hybrid lead halides; photoluminescence; quantum yield; single-phase phosphor; ultra-high color rendering
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Funding
- National Agency for Research (ANR) [ANR-16-CE08-0003-01]
- Region Pays de la Loire (Etoiles montantes en Pays de la Loire 2017, project Decouverte de perovskites hybrides assistee par ordinateur)
- National Natural Science Foundation of China [51472188, 51521001, 51872217]
- Natural Research Funds of Hubei Province [2016CFB583]
- 111 project [B13035]
- China Scholarship Council (CSC)
- Fundamental Research Funds for the Central Universities in China
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Near-UV-pumped white-light-emitting diodes with ultra-high color rendering and decreased blue-light emission is highly desirable. However, discovering a single-phase white light emitter with such characteristics remains challenging. Herein, we demonstrate that Mn doping as low as 0.027 % in the hybrid post-perovskite type (TDMP)PbBr4 (TDMP=trans-2,5-dimethylpiperaziniium) enables to achieve a bright pure white emission replicating the spectrum of the sun's rays. Thus, a white phosphor exhibiting an emission with CIE coordinates (0.330, 0.365), a high photoluminescence quantum yield of 60 % (new record for white light emission of hybrid lead halides), and an ultra-high color rendering index (CRI=96, R9=91.8), corresponding to the record value for a single phase emitter was obtained. The investigation of the photoluminescence properties revealed how free excitons, self-trapped excitons, and low amount of Mn dopants are coupled to give rise to such pure white emission.
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