Spectral Red Shift of Cs<sub>4</sub>Mn(Bi<sub>1–<i>x</i></sub>In<sub><i>x</i></sub>)<sub>2</sub>Cl<sub>12</sub> Layered Double Perovskite by Adjusting the Microstructure of the [MnCl<sub>6</sub>]<sup>4–</sup> Octahedron
Shuangshuang He, Shuangqiang Fang, Tao Han, Tianchun Lang, Mingsheng Cai, Houjiang You, Lingling Peng, Shixiu Cao, Bitao Liu, Qinping Qiang, Junyang Chen, Bingfu Lei
Abstract
As a non-toxic substitute for lead halide perovskite, layered perovskite has attracted great attention recently. In this work, it is reported that tunable visible light emission properties are given in direct band gap Cs4MnBi2Cl12 by doping In3+ ions. When the Bi3+ ion is replaced with the In3+ ion with a relatively small ion radius, it causes distortion of the [MnCl6]4– octahedron, which changes the local crystal field strength of the Mn2+ ion, and makes the emission band centered at 606 nm gradually red-shift to 616 nm. By employing Cs4MnBi2Cl12 and Cs4Mn(Bi0.88In0.12)2Cl12 as red-emitting phosphors, LED-1 with Ra = 82 and CCT = 4510 K and LED-2 with Ra = 86 and CCT = 4280 K were obtained, respectively. Compared with Cs4MnBi2Cl12, Cs4Mn(Bi0.88In0.12)2Cl12 contributes a wider color gamut of 76.4% NTSC for LED devices, than that of 74% NTSC, as R9 increases from 65 to 72. The current work provides a new direction for the regulation of optoelectronic properties in layered double perovskite.