Pressure-induced emission of cesium lead halide perovskite nanocrystals.
Pressure-induced emission of cesium lead halide perovskite nanocrystals.
复制标题
铯铅卤化物钙钛矿纳米晶的压力诱导发射
DOI：
10.1038/s41467-018-06840-8
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发表时间：
2018-10-29
影响因子：
16.6
通讯作者：
Zou B
中科院分区：
文献类型：
--
作者：
Ma Z;Liu Z;Lu S;Wang L;Feng X;Yang D;Wang K;Xiao G;Zhang L;Redfern SAT;Zou B
金属卤化物钙钛矿（MHP）由于其在太阳能电池和发光器件中的高量子效率而在光电子学中引起极大的兴趣。然而，探索一种有效的策略，以进一步提高他们的光学活动仍然是一个相当大的挑战。在这里，我们报告说，纳米晶体（NC）的最初非荧光零维（0D）铯铅卤化物钙钛矿Cs4PbBr6表现出独特的发射下的高压3.01 GPa。随后，Cs4PbBr6NC的发射强度在进一步压缩时经历显著增加。联合实验和理论分析表明，这种压力诱导发射（PIE）可能归因于增强的光学活性和增加的自陷激子的结合能后压缩。这种现象是由于[PbBr6]4−八面体基序的结构相变导致的大变形的结果。我们的研究结果表明，高压可以是一个强大的工具，以提高光致发光效率，并提供洞察的结构和光学性质之间的关系，在极端条件下的0D MHP。
Metal halide perovskites (MHPs) are of great interest for optoelectronics because of their high quantum efficiency in solar cells and light-emitting devices. However, exploring an effective strategy to further improve their optical activities remains a considerable challenge. Here, we report that nanocrystals (NCs) of the initially nonfluorescent zero-dimensional (0D) cesium lead halide perovskite Cs4PbBr6exhibit a distinct emission under a high pressure of 3.01 GPa. Subsequently, the emission intensity of Cs4PbBr6NCs experiences a significant increase upon further compression. Joint experimental and theoretical analyses indicate that such pressure-induced emission (PIE) may be ascribed to the enhanced optical activity and the increased binding energy of self-trapped excitons upon compression. This phenomenon is a result of the large distortion of [PbBr6]4−octahedral motifs resulting from a structural phase transition. Our findings demonstrate that high pressure can be a robust tool to boost the photoluminescence efficiency and provide insights into the relationship between the structure and optical properties of 0D MHPs under extreme conditions.
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