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Doped Lead Halide White Phosphors for Very High Efficiency and Ultra-High Color Rendering |
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| Authors: | Hailong Yuan Dr Florian Massuyeau Nicolas Gautier Dr Antoine Blaise Kama Dr Eric Faulques Dr Fei Chen Dr Qiang Shen Dr Lianmeng Zhang Dr Michael Paris Dr Romain Gautier |
| Institution: | 1. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China
Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, F-44000 Nantes cedex 3, France;2. Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, F-44000 Nantes cedex 3, France;3. Institut des Matériaux Jean Rouxel (IMN), Université de Nantes, CNRS, F-44000 Nantes cedex 3, France Laboratoire de Chimie Minérale et Analytique (LA.CHI.MIA), Département de Chimie, Faculté des sciences et techniques, Université Cheikh Anta Diop de Dakar, Dakar, Senegal;4. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070 China |
| Abstract: | 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. |
| Keywords: | Einzelphasen-Leuchtstoff Hybrid-Bleihalogenide Photolumineszenz Quantenausbeute Ultrahoher Farbwiedergabeindex |