Novel Cyan-Green-Emitting Bi 3+ -Doped BaScO 2 F, R + (R = Na, K, Rb) Perovskite Used for Achieving Full-Visible-Spectrum LED Lighting

作者：Mingsheng Cai, Tianchun Lang, Tao Han, Damir Valiev, Shuangqiang Fang, Chaozhong Guo, Shuangshuang He, Lingling Peng, Shixiu Cao, Bitao Liu, Ling Du, Yang Zhong, Е. Ф. Полисадова · 发表于：Inorganic Chemistry · 年份：2021 · DOI：10.1021/acs.inorgchem.1c02150 · 被引用次数：50 · 研究领域：Luminescence Properties of Advanced Materials、Perovskite Materials and Applications、Ga2O3 and related materials

Cyan-emitting phosphors are important for near-ultraviolet (NUV) light-emitting diodes (LEDs) to gain high-quality white lighting. In the present work, a Bi 3+ -doped BaScO 2 F, R + (R = Na, K, Rb) perovskite, which emits 506 nm cyan-green light under 360 or 415 nm excitation, is obtained via a high-temperature solid-state method for the first time. The obtained perovskite shows improved photoluminescence and thermal stability due to the charge compensation of Na +, K +, and Rb + co-doping. Its spectral broadening is attributed to two centers Bi (1) and Bi (2), which are caused by the zone-boundary octahedral tilting due to the substitution of Bi 3+ for the larger Ba 2+ . Employing the blend phosphors of Ba 0.998 ScO 2 F:0.001Bi 3+,0.001K + and the commercial BAM:Eu 2+, YAG:Ce 3+, and CaAlSiN 3:Eu 2+, a full-spectrum white LED device with R a = 96 and CCT = 4434 K was fabricated with a 360 nm NUV chip. Interestingly, a novel strategy is proposed: the cyan-green Ba 0.998 ScO 2 F:0.001Bi 3+,0.001K + and orange Sr 3 SiO 5:Eu 2+ phosphors were packaged with a 415 nm NUV chip to produce the white LED with R a = 85 and CCT = 4811 K.