摘要
近年来,高掺Er3+纳米晶的上转换发光研究取得了显著进展.与传统发光材料相比,这类材料具有多波段激发、穿透能力强的激发波段、光色动态可调以及对外场刺激响应灵敏等特点,在光信息安全、温度探针、生物成像等领域展现出巨大应用潜力.本文综述了高掺杂Er3+纳米晶发光性质的多维调控策略,涵盖基质组成、结构设计以及能量传递机制的深入解析,详细探讨了发光强度增强、光色调控、动力学过程调节和激发波段拓宽等方面的最新研究成果.此外,本文还探究了外场激励对高掺杂Er3+体系发光性能的调控机制,详细分析了温度、压力及金属表面电场等关键因素的影响,并从提升多光子跃迁概率和减少无辐射能量损失等角度揭示发光增强机理.最后,总结了激发模式调控高掺杂Er3+上转换发光的有效方法,并对未来发展方向进行了展望.
Abstract
Over recent years,research into the upconversion luminescence properties of highly doped Er3+nano-crystals has undergone rapid advancement.Compared to traditional doping materials,these materials exhibit unique features such as multi-band excitation,strong excitation wavelength penetration,dynamic control over optical color,and highly sensitive to external field stimuli,showing great promise in various research domains including optical in-formation security,temperature sensing,and bioimaging.This review provides a comprehensive overview of the tech-niques for tuning upconversion luminescence intensity,emission colors,decay characteristics,and excitation bands through ways of such as matrix composition,structural design,and energy transfer processes.Additionally,we ex-plore the impact of external field stimuli such as temperature,pressure,and metal surface electric fields on the lumi-nescence properties of highly Er3+doped nanocrystals.The mechanisms behind luminescence enhancement are dis-cussed in terms of increased multiphoton transition probabilities and reduced non-radiative energy losses.Finally,we summarize the research on modulating excitation modes in highly doped Er3+nanocrystals and propose directions for future investigations.
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