Improved Energy Transfer in Mn-Doped Cs3Cu2I5 Microcrystals Induced by Localized Lattice Distortion.
Improved Energy Transfer in Mn-Doped Cs3Cu2I5 Microcrystals Induced by Localized Lattice Distortion.
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DOI：
10.1021/acs.jpclett.2c03039
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Yangxiang Hu;Xinxin Yan;Li-Yai Zhou;Peican Chen;Q. Pang;Yibo Chen
中科院分区：
文献类型：
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作者：
Yangxiang Hu;Xinxin Yan;Li-Yai Zhou;Peican Chen;Q. Pang;Yibo Chen
发光的铜(I)基卤化物作为铅基钙钛矿的替代品在光电领域受到了广泛的关注。然而，通过简单的掺杂Mn2+来延长发射波长仍然是一个挑战。本文采用温和溶液法合成了掺杂Mn2+的Cs3Cu2I5微晶体，并在445 nm和560 nm处观察到自捕获激子（STEs）和Mn2+的双发射带。更重要的是，进一步引入碱金属离子（Rb+, K+, Na+）大大提高了Cs3Cu2I5-Mn微晶的发光性能。掺Na+的典型样品的STE→Mn2+能量转移效率从~ 0提高到21.30%，光致发光量子产率（PLQY）从47.32%提高到62.06%。详细的结构和光学表征结合DFT计算证明，碱金属离子掺杂引起晶格畸变，增强了[MnI4]和[CuI4]四面体之间的耦合，从而提高了能量传递效率和PLQY。
With nontoxicity and high emission efficiency, luminescent copper(I)-based halides have attracted much attention as alternatives for lead-based perovskites in photoelectric domains. However, extending the emission wavelength by doping with Mn2+ in a facile way is still a challenge. In this work, Mn2+-doped Cs3Cu2I5 microcrystals were synthesized by a mild solution method, and double emission bands from self-trapped excitons (STEs) and Mn2+ peaking at 445 and 560 nm, respectively, were observed. More importantly, further introduction of alkali metal ions (Rb+, K+, Na+) considerably promoted the luminescence performance of the Cs3Cu2I5-Mn microcrystals. The STE → Mn2+ energy transfer efficiency of the typical sample doped with Na+ increased from ∼0 to 21.30%, and the photoluminescence quantum yield (PLQY) increased from 47.32% to 62.06%. The detailed structural and optical characterizations combined with DFT calculations proved that the doping with alkali metal ions causes lattice distortion and enhances the coupling between [MnI4] and [CuI4] tetrahedra, thus promoting the energy transfer efficiency and the PLQY.