Li+-Induced Enhancement of Excitonic Luminescence in γ-CuBr Single Crystals Grown by the Vertical Bridgman Method

IF 3.6 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Crystal Growth & Design Pub Date : 2026-10-21 Epub Date: 2026-10-03 DOI:10.1021/acs.cgd.6c01110

Zhijin Zhang, Yizhe Hu, Qiuyu Yu, Jiacheng Pan, Jianguo Pan, Shangke Pan

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Abstract

The intrinsic defects in pure γ-CuBr crystal lead to obvious nonradiative recombination, thereby significantly suppressing its ultrafast free-exciton emission. In this study, we successfully grew undoped and Li⁺-doped CuBr:x%Li (x = 0, 1, 3, 5) single crystals using the vertical Bridgman method after purifying raw materials via recrystallization. The influence of Li⁺ ion incorporation on the crystal structure and photoluminescence (PL) properties was investigated. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed that Li⁺ is incorporated in the lattice of γ-CuBr. Moderate Li⁺ doping markedly enhances the near-band-edge (NBE) emission, with CuBr:3%Li composition exhibiting the highest PL intensityapproximately six times that of pure CuBr. Time-resolved PL further demonstrates an ultrafast radiative decay lifetime of 2.40 ns at 419 nm for the optimal crystal. Temperature-dependent photoluminescence (PL) measurements revealed that the thermal stability of NBE emission significantly improved after Li⁺ doping. The thermal activation energy of CuBr:3%Li is 382.6 meV.

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垂直桥人法生长γ- cur单晶中Li+诱导的激子发光增强

纯γ- cur晶体的固有缺陷导致了明显的非辐射复合，从而显著抑制了其超快自由激子发射。在本研究中，我们通过再结晶提纯原料后，利用垂直Bridgman法成功地生长出了未掺杂和Li+掺杂的cur:x%Li （x = 0,1,3,5）单晶。研究了Li+离子掺入对晶体结构和光致发光性能的影响。x射线衍射（XRD）和x射线光电子能谱（XPS）证实Li+存在于γ- cur晶格中。适量的Li+掺杂显著增强了近带边缘（NBE）发射，其中cur:3%Li的组合物表现出最高的PL强度，约为纯cur的6倍。时间分辨PL进一步证明了最佳晶体在419 nm处的超快辐射衰减寿命为2.40 ns。温度依赖性光致发光（PL）测量表明，Li+掺杂后NBE发射的热稳定性显著提高。CuBr:3%Li的热活化能为382.6 meV。

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

Crystal Growth & Design 化学-材料科学：综合

CiteScore

6.30

自引率

10.50%

发文量

650

审稿时长

1.9 months

期刊介绍： The aim of Crystal Growth & Design is to stimulate crossfertilization of knowledge among scientists and engineers working in the fields of crystal growth, crystal engineering, and the industrial application of crystalline materials. Crystal Growth & Design publishes theoretical and experimental studies of the physical, chemical, and biological phenomena and processes related to the design, growth, and application of crystalline materials. Synergistic approaches originating from different disciplines and technologies and integrating the fields of crystal growth, crystal engineering, intermolecular interactions, and industrial application are encouraged.