Doped Lead Halide White Phosphors for Very High Efficiency and Ultra-High Color Rendering
Yuan, Massuyeau, Gautier, Kama, Faulques, Chen, Shen, Zhang, Paris, Gautier (2020) Doped Lead Halide White Phosphors for Very High Efficiency and Ultra-High Color Rendering Angew Chem Int Ed Engl (IF: -1) 59(7) 2802-2807Abstract
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.© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Links
http://www.ncbi.nlm.nih.gov/pubmed/31830354http://dx.doi.org/10.1002/anie.201910180
