Theoretical design and experimental realization of Fe3+-doped dual-band near-infrared garnet phosphors†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Yutong Wang, Anfei Chen, Sha Jiang, Lei Zhong, Li Li, Xianju Zhou, Chang-Kui Duan and Qiaoling Chen
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Abstract

Cr3+-free near-infrared (NIR) phosphors based on Fe3+ have garnered extensive attention due to their environmentally friendly and tunable optical properties. However, the reported luminescence predominantly originates from the Fe3+ ion in tetrahedral coordination, with wavelengths in the range of 670–830 nm. Phosphors with luminescence from octahedrally coordinated Fe3+, which are expected to shift to longer wavelengths over 900 nm, are limited due to the challenges such as quenching mechanisms. Garnets with the formula A3B2C3O12 are excellent hosts for phosphors due to their rigid structures and tunable luminescence properties. Theoretical analysis, supported by first-principles calculations, indicates that Fe3+ can occupy both tetrahedral (Fe(T)) and octahedral (Fe(O)) sites, potentially producing dual-band emission in garnet crystals with large octahedral host ions, such as Sr3 (Sc/Lu/Y)2Ge3O12 crystals. This has guided us in the experimental realization of dual-band NIR luminescence, peaking at 720–730 nm (Fe(T)) and 980–990 nm (Fe(O)), in these materials. Consistent with our optical transition analysis, the luminescence intensities of Fe(T) and Fe(O) show different temperature dependencies. Fe(T) exhibits weaker temperature dependence, while Fe(O) experiences severe temperature quenching via the 2T2 intermediate energy level. The dual-band NIR phosphors Sr3 (Sc/Lu/Y)2Ge3O12:Fe3+ show potential applications in luminescence intensity ratio-based and luminescence decay time-based thermometers, with a significant maximum relative sensitivity of 1.24% K−1 at 155 K. The materials designed here provide a foundation for related application explorations, and the strategy developed can be applied to the exploration and development of Fe3+-activated advanced optical materials.

Abstract Image

掺Fe3+双波段近红外石榴石荧光粉的理论设计与实验实现
基于Fe3+的无Cr3+近红外(NIR)荧光粉由于其环保和可调谐的光学特性而受到广泛关注。然而,报道的发光主要来自四面体配位的Fe3+离子,波长在670-830 nm之间。八面体配位Fe3+发光的荧光粉有望向900 nm以上的波长转移,但由于猝灭机制等挑战,荧光粉的发展受到限制。分子式为A3B2C3O12的石榴石由于其刚性结构和可调谐的发光特性而成为优秀的荧光粉宿主。理论分析和第一性原理计算表明,Fe3+可以占据四面体(Fe(T))和八面体(Fe(O))两个位置,在具有大八面体主离子的石榴石晶体(如Sr3(Sc/Lu/Y)2Ge3O12晶体)中可能产生双频发射。这指导我们在实验中实现了双波段近红外发光,在这些材料中,峰值在720-730 nm (Fe(T))和980-990 nm (Fe(O))。与我们的光学跃迁分析一致,Fe(T)和Fe(O)的发光强度表现出不同的温度依赖性。Fe(T)表现出较弱的温度依赖性,而Fe(O)通过2T2中间能级经历了严重的温度猝灭。双频近红外荧光粉Sr3(Sc/Lu/Y)2Ge3O12:Fe3+在基于发光强度比和基于发光衰减时间的温度计中显示出潜在的应用前景,在155 K时的最大相对灵敏度为1.24%K−1。本文设计的材料为相关的应用探索提供了基础,所制定的策略可应用于Fe3+活化先进光学材料的探索和开发。
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
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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