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Self-trapped-induced energy funneling and broadband emission in the Mn2+ doped two-dimensional perovskite
Journal of Luminescence ( IF 3.6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.jlumin.2020.117457
Song Wang , Peiqing Cai , Tianmou Xu , Xipeng Pu , Peng Du , Xiangfu Wang , Ying Tang , Xiaolin Yuan , Huacai Chen , Qi Ai , Junjie Si , Xin Yao , Maxim K. Rabchinskii , Pavel N. Brunkov , Zugang Liu

Abstract The electronic structure modulations by metal cation doping and organic ligands modification are aroused great interests in perovskite community for spectrum tailoring and quantum yield (QY) enhancement. Herein, we synthesized the two-dimensional (2D) lead bromide perovskite with cyclohexenylethylamine as the organic ammonium ligands and divalent manganese as the doping ions by the combination of facile solution processes and low temperature solid-state method. Thanks to the synergy effects of the steric-hindrance induced self-trapped exciton (STE) by A-site engineering and the elevation of cascaded energy funneling among the FE, STE and the 4T1→6A1 transition of Mn2+. The emission spectrum of the Mn2+ doped 2D perovskite simultaneously covers both the blue and orange range with a QY of 47.01%, where the value is about twelve times of that of the un-doped one at room temperature. Our results indicate that the utilizing of soft organic ammonium and Mn2+ doping in 2D perovskite could not only adjust the energy level states and improve the QY remarkably, but also explore new opportunities in warm-white LEDs and other applications.

中文翻译:

Mn2+掺杂二维钙钛矿中自陷诱导的能量漏斗和宽带发射

摘要 金属阳离子掺杂和有机配体改性引起的电子结构调制引起了钙钛矿社区对光谱剪裁和量子产率(QY)增强的极大兴趣。在此,我们以环己烯基乙胺为有机铵配体,二价锰为掺杂离子,通过简便的溶液法和低温固相法合成了二维(2D)溴化铅钙钛矿。由于空间位阻诱导的自陷激子 (STE) 的协同效应,以及 FE、STE 和 Mn2+ 的 4T1→6A1 跃迁之间级联能量漏斗的提升。Mn2+ 掺杂的二维钙钛矿的发射光谱同时覆盖蓝色和橙色范围,QY 为 47.01%,其中该值约为室温下未掺杂的值的十二倍。我们的研究结果表明,在二维钙钛矿中使用软有机铵和 Mn2+ 掺杂不仅可以调整能级状态并显着提高 QY,而且还为暖白光 LED 和其他应用开辟了新的机会。
更新日期:2020-10-01
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