Tuning the Near Infrared Emission of MgO:Cr3+ Phosphors by Inducing Ti4+ Ions

IF 3 4区化学 Q2 CHEMISTRY, ANALYTICAL

Luminescence Pub Date : 2025-07-08 DOI:10.1002/bio.70255

Keyue Wu, Yi Yang, Zeya Wang

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Abstract

Near-infrared (NIR) phosphors activated by Cr³⁺ ions hold significant potential for applications such as night vision and plant growth lighting due to their tunable emission properties governed by crystal field (CF) strength. In this study, Cr³⁺ and Ti⁴⁺ co-doped MgO phosphors were synthesized via a high-temperature solid-state reaction to modulate the NIR emission. Structural and optical characterizations revealed that Ti⁴⁺ incorporation enhances the CF strength (Dq/B ratio increases from 2.4 to 2.6), inducing a blue shift in the emission peak from 810 (MgO:Cr³⁺) to 780 nm (Mg_0.8Ti_0.2O:Cr³⁺) and with a strong sharp emission at 720 nm. The Ti⁴⁺ doping also increases the fluorescence lifetime from 150.9 to 816.4 μs, attributed to altered Cr³⁺ occupancy in octahedral sites and modified spin-allowed transitions. These findings demonstrate that Ti⁴⁺ co-doping effectively tunes the NIR emission of MgO:Cr³⁺ phosphors, offering a promising strategy for designing wavelength-adjustable NIR light sources.

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通过诱导Ti4+离子调节MgO:Cr3+荧光粉的近红外发射

由Cr3+离子激活的近红外（NIR）荧光粉由于其由晶体场（CF）强度控制的可调谐发射特性，在夜视和植物生长照明等应用中具有重要的潜力。在本研究中，通过高温固相反应合成了Cr3+和Ti4+共掺杂的MgO荧光粉来调节近红外发射。结构和光学表征表明，Ti4+的掺入增强了CF强度（Dq/B比从2.4增加到2.6），导致发射峰从810 nm （MgO:Cr3+）蓝移到780 nm (mg0.8 ti0.2:Cr3+)，并在720 nm处有强烈的锐发射。Ti4+的掺杂也使荧光寿命从150.9 μs增加到816.4 μs，这是由于改变了Cr3+在八面体中占据的位置和改变了自旋允许跃迁。这些发现表明，Ti4+共掺杂可以有效地调节MgO:Cr3+荧光粉的近红外发射，为设计波长可调的近红外光源提供了一种有前途的策略。

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

Luminescence 生物-生化与分子生物学

CiteScore

5.10

自引率

13.80%

发文量

248

审稿时长

3.5 months

期刊介绍： Luminescence provides a forum for the publication of original scientific papers, short communications, technical notes and reviews on fundamental and applied aspects of all forms of luminescence, including bioluminescence, chemiluminescence, electrochemiluminescence, sonoluminescence, triboluminescence, fluorescence, time-resolved fluorescence and phosphorescence. Luminescence publishes papers on assays and analytical methods, instrumentation, mechanistic and synthetic studies, basic biology and chemistry. Luminescence also publishes details of forthcoming meetings, information on new products, and book reviews. A special feature of the Journal is surveys of the recent literature on selected topics in luminescence.