Near-Infrared Emission Properties and LED Applications of Y2Ti2O7:Cr3+/Nd3+ Phosphors Improved by Doping with Ce3+ Ions

IF 0.7 4区化学 Q4 CHEMISTRY, PHYSICAL

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI:10.1134/s0036024424701565

Shanshan Cong, Hongquan Yu, Xiao Gao, Zhanwen Han, Baojiu Chen, Jiashi Sun, Xiangping Li

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Abstract

Near infrared (NIR) Y₂Ti₂O₇:Ce³⁺/Cr³⁺/Nd³⁺ phosphors were synthesized using a solid-state reaction technique. NIR luminescent performance of Y₂Ti₂O₇:Cr³⁺/Nd³⁺ phosphors was improved by doping with Ce³⁺ ions. The emission intensity of Y₂T₂O₇:Cr³⁺/Nd³⁺/Ce³⁺ phosphors is significantly higher than that of Y₂Ti₂O₇:Cr³⁺/Nd³⁺ phosphors. The external quantum efficiency and internal quantum efficiency of Y₂Ti₂O₇:0.5% Cr³⁺/0.7% Nd³⁺/1.5% Ce³⁺ are 16 and 22.8%, respectively. The luminescent mechanisms of the Y₂Ti₂O₇:Cr³⁺/Nd³⁺ and Y₂T₂O₇:Cr³⁺/Nd³⁺/Ce³⁺ phosphors were investigated. As a result, the effective energy transfer process from Cr³⁺ to Nd³⁺ ions exists in Y₂Ti₂O₇:Cr³⁺/Nd³⁺ phosphors, while the effective energy transfer process from Ce³⁺ to Cr³⁺ and Nd³⁺ ions exists in Y₂T₂O₇:Cr³⁺/Nd³⁺/Ce³⁺ phosphors. NIR emission intensities of LED devices assembled with Y₂Ti₂O₇:0.5% Cr³⁺/0.7% Nd³⁺/1.5% Ce³⁺ phosphors are better than those of LED devices assembled with Y₂Ti₂O₇:0.5% Cr³⁺/0.7% Nd³⁺ phosphors at different work currents. In addition, the temperature-sensitive behavior of Y₂Ti₂O₇:Cr³⁺/Nd³⁺ phosphors was also studied. Their LIR and S_a values monotonically increase in the temperature range of 303–393 K. The maximum S_a values of Y₂Ti₂O₇:0.5% Cr³⁺/0.5% Nd³⁺, Y₂Ti₂O₇:0.5% Cr³⁺/0.7% Nd³⁺, Y₂Ti₂O₇:0.5% Cr³⁺/1.0% Nd³⁺, Y₂Ti₂O₇:0.5% Cr³⁺/2.0% Nd³⁺ samples are 0.79 × 10^–2, 0.88 × 10^–2, 1.24 × 10^–4, and 2.53 × 10^–3 K^–1, respectively.

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通过掺杂 Ce3+ 离子改进 Y2Ti2O7:Cr3+/Nd3+ 磷光体的近红外发射特性和 LED 应用

摘要利用固态反应技术合成了近红外（NIR）Y2Ti2O7:Ce3+/Cr3+/Nd3+荧光粉。通过掺杂 Ce3+ 离子提高了 Y2Ti2O7:Cr3+/Nd3+ 荧光粉的近红外发光性能。Y2Ti2O7:Cr3+/Nd3+/Ce3+ 荧光粉的发射强度明显高于 Y2Ti2O7:Cr3+/Nd3+ 荧光粉。Y2Ti2O7:0.5% Cr3+/0.7% Nd3+/1.5% Ce3+ 的外量子效率和内量子效率分别为 16% 和 22.8%。研究了 Y2Ti2O7:Cr3+/Nd3+ 和 Y2Ti2O7:Cr3+/Nd3+/Ce3+ 荧光粉的发光机制。结果表明，在 Y2Ti2O7:Cr3+/Nd3+ 荧光粉中存在从 Cr3+ 到 Nd3+ 离子的有效能量转移过程，而在 Y2Ti2O7:Cr3+/Nd3+/Ce3+ 荧光粉中存在从 Ce3+ 到 Cr3+ 和 Nd3+ 离子的有效能量转移过程。在不同工作电流下，用 Y2Ti2O7:0.5% Cr3+/0.7% Nd3+/1.5% Ce3+ 荧光粉组装的 LED 器件的近红外发射强度优于用 Y2Ti2O7:0.5% Cr3+/0.7% Nd3+ 荧光粉组装的 LED 器件。此外，还研究了 Y2Ti2O7:Cr3+/Nd3+ 荧光粉的温度敏感性。Y2Ti2O7:0.5% Cr3+/0.5% Nd3+、Y2Ti2O7:0.5% Cr3+/0.7% Nd3+、Y2Ti2O7:0.5% Cr3+/1.0% Nd3+、Y2Ti2O7:0.5% Cr3+/2.0% Nd3+样品的最大 Sa 值分别为 0.79 × 10-2、0.88 × 10-2、1.24 × 10-4 和 2.53 × 10-3 K-1。

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来源期刊

Russian Journal of Physical Chemistry A 化学-物理化学

CiteScore

1.20

自引率

14.30%

发文量

376

审稿时长

5.1 months

期刊介绍： Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.

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