Enhanced Luminescence Performance of Cr-Doped CaMgSi2O6 Phosphor via Alkali Metal Ion Codoping

IF 3.4 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Crystal Growth & Design Pub Date : 2025-09-03 DOI:10.1021/acs.cgd.5c00964

Lizhen Zhang, Lehui Liu, Feifei Yuan, Yisheng Huang* and Zhoubin Lin,

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Abstract

Enhancing the luminous intensity of near-infrared (NIR) phosphors is critical for practical applications. This study demonstrates that codoping charge-compensating ions (Li⁺, Na⁺, and K⁺) significantly improves the fluorescence emission intensity and quantum efficiency of Cr³⁺-doped CaMgSi₂O₆ (CMSO:Cr) phosphors. Optimal enhancements were achieved with specific ion concentrations: the CMSO:0.01Cr phosphor codoped with 0.8 at. % Na₂CO₃ exhibited a 1.8-fold increase in emission intensity, while the CMSO:0.04Cr phosphor codoped with 1.5 at. % Li₂CO₃ demonstrated an 8-fold enhancement. Charge compensation also improved the internal quantum yield (IQY) and photoelectric conversion efficiency without compromising the thermal stability. Mechanistic insights from absorption/emission spectra, electron paramagnetic resonance (EPR), and fluorescence lifetime analyses revealed that alkali metal ions occupy defect sites, suppress nonradiative recombination, and simplify emission profiles by eliminating defect-induced luminescent centers.

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碱金属离子共掺杂增强cr掺杂CaMgSi2O6荧光粉的发光性能

提高近红外（NIR）荧光粉的发光强度对实际应用至关重要。本研究表明，共掺杂电荷补偿离子（Li+、Na+和K+）可显著提高Cr3+掺杂CaMgSi2O6 （CMSO:Cr）荧光粉的荧光发射强度和量子效率。在特定离子浓度下获得了最佳的增强效果：CMSO:0.01Cr荧光粉共掺杂0.8 at。当CMSO:0.04Cr共掺杂1.5 at时，% Na2CO3的发射强度增加了1.8倍。% Li2CO3显示出8倍的增强。电荷补偿还在不影响热稳定性的情况下提高了内量子产率和光电转换效率。吸收/发射光谱、电子顺磁共振（EPR）和荧光寿命分析的机理揭示，碱金属离子占据缺陷位点，抑制非辐射重组，并通过消除缺陷引起的发光中心简化发射谱。

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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.