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Doped Lead Halide White Phosphors for Very High Efficiency and Ultra‐High Color Rendering
Author(s) -
Yuan Hailong,
Massuyeau Florian,
Gautier Nicolas,
Kama Antoine Blaise,
Faulques Eric,
Chen Fei,
Shen Qiang,
Zhang Lianmeng,
Paris Michael,
Gautier Romain
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201910180
Subject(s) - photoluminescence , color rendering index , phosphor , halide , optoelectronics , quantum yield , common emitter , materials science , color temperature , doping , high color , dopant , light emitting diode , diode , exciton , optics , chemistry , fluorescence , physics , inorganic chemistry , image (mathematics) , quantum mechanics , artificial intelligence , color image , computer science , image processing
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)PbBr 4 (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.