光致发光
材料科学
离子
发光
热液循环
发光二极管
带隙
光子上转换
兴奋剂
荧光粉
空位缺陷
锰
卤化物
分析化学(期刊)
光电子学
化学
无机化学
结晶学
有机化学
色谱法
冶金
地震学
地质学
作者
Peipei Dang,Qian Zhang,Wei Wang,Hongzhou Lian,Guogang Li,Jun Lin
标识
DOI:10.1021/acs.chemmater.2c03246
摘要
Combining rare-earth ions (RE3+) in halide perovskites is a hopeful strategy to produce interesting optical properties in visible and near-infrared (NIR) regions. Here, RE3+ (RE: Nd, Ho, Er, Tm) ions are successfully introduced into Cs4Cd1–wMnwBi2Cl12 (0 ≤ w ≤ 1) vacancy-ordered quadruple perovskites through a facile hydrothermal method. In addition to the strong orange-red Mn2+ emission, the as-prepared materials exhibit the effective characteristic emission of RE3+ in the red and NIR regions via constructing a Mn2+ energy bridge. With Mn2+ gradually replacing Cd2+ in Cs4Cd1–wMnwBi2Cl12:RE3+, the photoluminescence (PL) of RE3+ in the red and NIR ranges shows an increasing trend until it reaches the strongest value (w = 1). The energy transfer processes of [BiCl6]3– → Mn2+ → RE3+ are confirmed, and the corresponding mechanism is explored. According to the manipulation of the Mn2+/Cd2+ component, an evolution process from direct to indirect band gaps is verified via a combined experimental–theoretical approach. White light-emitting diodes (LEDs) are fabricated by employing Ho3+-doped Cs4MnBi2Cl12 on near-ultraviolet (n-UV) LED chips, achieving an improved color rendering index (CRI) from 83.3 to 93.0 compared to that of the parent compound. Codoping RE3+ (RE: Nd, Ho, Er, Tm) ions into Cs4MnBi2Cl12 results in an ultrawide emission covering both NIR I and NIR II regions, implying a great potential for NIR detection application.
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