Remarkable Piezochromism and Pressure-Induced Blue Emission Enhancement in Complex-Unit Copper Halides

IF 8.7 1区化学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Materials Letters Pub Date : 2025-02-14 DOI:10.1021/acsmaterialslett.4c02556

Ming Cong, Qiushuang Li, Xuchen Wang, Jiayi Yang, Yongguang Li, Le Ye, Guanjun Xiao* and Bo Zou,

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Abstract

Piezochromic luminescent materials (PLMs) exhibit potential applications in pressure sensing, anticounterfeiting, and optical memory. However, balancing a wide range of emission shifts with high pressure-sensitivity remains a challenge. Here, we achieved a considerable blue-shift piezochromism of 187 nm in zero-dimensional (0D) copper halide (TPA)₂Cu₄Br₆ (TPA = Tetrapropylammonium), with a pressure coefficient over 80 nm/GPa below 10 kbar. Structural analysis confirmed that increased pressure deepened the high-energy self-trapped excitons (STEs) and disrupted the orderly arrangement of the [Cu₄Br₆]^2– clusters. These two factors collectively diminished the interaction between STEs and depressed the formation of low-energy STEs, resulting in a significant blue shift in emission. Moreover, the decreased energy loss resulting from depressed phonon–phonon interaction led to a high photoluminescence quantum yield (PLQY) which remained over 70% during the blue-shift process and enabled the enhanced display performance as PLMs. This study demonstrated a highly sensitive PLM and revealed photophysical mechanism regarding the configuration and arrangement of complex clusters.

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络合单元卤化铜中显著的压致变色和压力诱导蓝光发射增强

压电致变色发光材料（PLMs）在压力传感、防伪和光存储方面具有潜在的应用前景。然而，平衡大范围的排放变化与高压力敏感性仍然是一个挑战。在这里，我们在零维（0D）卤化铜（TPA）2Cu4Br6 （TPA =四丙基铵）中实现了相当大的187nm的蓝移压变色，压力系数超过80nm /GPa，低于10kbar。结构分析证实，压力的增加加深了高能自困激子（STEs），破坏了[Cu4Br6]2 -簇的有序排列。这两个因素共同减弱了es之间的相互作用，抑制了低能es的形成，导致了明显的蓝移。此外，声子-声子相互作用抑制导致的能量损失降低导致高光致发光量子产率（PLQY）在蓝移过程中保持在70%以上，从而提高了plm的显示性能。该研究展示了一个高度敏感的PLM，并揭示了复杂簇的结构和排列的光物理机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

ACS Materials Letters MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

14.60

自引率

3.50%

发文量

261

期刊介绍： ACS Materials Letters is a journal that publishes high-quality and urgent papers at the forefront of fundamental and applied research in the field of materials science. It aims to bridge the gap between materials and other disciplines such as chemistry, engineering, and biology. The journal encourages multidisciplinary and innovative research that addresses global challenges. Papers submitted to ACS Materials Letters should clearly demonstrate the need for rapid disclosure of key results. The journal is interested in various areas including the design, synthesis, characterization, and evaluation of emerging materials, understanding the relationships between structure, property, and performance, as well as developing materials for applications in energy, environment, biomedical, electronics, and catalysis. The journal has a 2-year impact factor of 11.4 and is dedicated to publishing transformative materials research with fast processing times. The editors and staff of ACS Materials Letters actively participate in major scientific conferences and engage closely with readers and authors. The journal also maintains an active presence on social media to provide authors with greater visibility.