材料科学
发光
钙钛矿(结构)
带隙
激子
跃迁偶极矩
辐射传输
荧光
激发
光致发光
三元运算
荧光粉
波长
光电子学
偶极子
结晶学
光学
化学
物理
凝聚态物理
有机化学
量子力学
计算机科学
程序设计语言
作者
Zhenren Gao,Xing Shen,Pengbo Lyu,Changfu Xu,Dong Fan,Lizhong Sun
标识
DOI:10.1002/adom.202300956
摘要
Abstract Both theoretical and experimental approaches are utilized to investigate the fluorescence mechanism of B‐site substituted Cs 2 XCl 6 (A 2 BX 6 ‐type perovskite, X = Sn, Hf, Zr, Ti), aiming to enhance the luminescence and tune the emission wavelengths. Using Te‐monosubstituted Cs 2 SnCl 6 as a model system, thecomputational discovery that the introduction of out‐gap and in‐gap bands by Te can significantly enhance its transition dipole moment is reported. This is further experimentally confirmed, showing a single emission peak resulting from the radiative transition between the out‐gap and in‐gap bands. The broadening of the emission peak is attributed to self‐trapped exciton (STE), while additional absorption/excitation peaks arise from composition segregation. Additionally, the high‐throughput first‐principles calculations indicate that substituting B‐sites of Cs 2 XCl 6 with Se, Te, Po, As, Sb, and Bi may also significantly enhance their light emission with the introduced bands. Thus, fine‐tuning the emission wavelengths by controlling the position of out‐gap and in‐gap bands through cation selection is proposed. Furthermore, tunable white‐light emission is achieved with excellent color stability by adjusting the Te and Bi composition in co‐substituted Cs 2 SnCl 6 material. The findings highlight the potential of utilizing out‐gap and in‐gap bands to tune luminescence in this perovskite family for advanced device applications, including white‐light‐emitting diodes (WLEDs).
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