Er^(3+)掺杂上转换发光材料的光谱调控  

Spectral modulation of Er^(3+) doped up-conversion phosphors

作　　者：陈玉华[1] 金旻坤 唐晶晶 陈长恒 向进猛 孙佳树 郭崇峰[1] CHEN Yuhua;JIN Minkun;TANG Jingjing;CHEN Changheng;XIANG Jinmeng;SUN Jiashu;GUO Chongfeng(State Key Laboratory of Photon-Technology in Western China Energy,Institute of Photonics&Photon-Technology,Northwest University,Xi′an 710127,Shaanxi,China)

机构地区：[1]西北大学光子学与光子技术研究所,省部共建西部能源光子技术国家重点实验室,陕西西安710127

出　　处：《陕西师范大学学报（自然科学版）》2022年第1期53-66,共14页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：国家自然科学基金(11974278)。

摘　　要：稀土掺杂上转换荧光粉作为一类重要的发光材料,凭借其低自发荧光、高稳定性和抗光漂白性的特点广泛应用于传感、防伪、生物成像、光动力和光热治疗等领域。但不同应用领域对材料光学特性的要求不尽相同,因此有必要根据需求对上转换发光材料的发射光谱进行有效调控。综述了Er^(3+)激活的上转换发光材料的光谱调控策略,其中通过改变基质种类,发光材料结构和掺杂浓度等传统的化学组分调控可以从根本上实现颜色的可调发射,但具有不可逆性故需要进行大量复杂实验。相比之下,外场调控通过改变外界的电磁场、温度、压力、激发光源参数等外部物理环境条件,改变发光材料所处外界环境改变稀土离子各能级上的电子布居,进而实现对荧光粉发光颜色的调控。此类方案可以实现对稀土掺杂上转换荧光材料光谱的连续调控,其颜色的转变具有较好的可重复性与可逆性。明确调控手段并对其中的机理进行分析有助于深入了解Er^(3+)上转换发射光谱调控的本质,为设计新型的光学调控手段奠定基础。Rare earth-doped up-conversion(UC)phosphors,as an important type of phosphors,are widely used in sensing,anti-counterfeiting,bio-imaging,photo-dynamic and photo-thermal therapy with their advantages of low auto-fluorescence,high stability and resistance to photo-bleaching.However,different application fields have different requirements for the optical properties of materials,it is necessary to effectively modulate the emission spectra of UC phosphors according to requirements.The present paper reviews the spectral modulation of Er^(3+) doped UC phosphors,in which traditional chemical component modulation such as the type of matrix,phosphors structure and doping concentration can be adjusted fundamentally to achieve color tunable emission.Nevertheless this method is uncertain and irreversible and requires a lot of complicated experiments.In contrast,external field modulation changes the environment of the samples and the electron population at each energy level of the rare earth ions by changing the external physical environmental conditions including the external electromagnetic field,temperature,pressure,and excitation light source parameters,thereby realizing the color of the phosphor.These methods can achieve a continuous spectral regulation of the rare earth-doped UC fluorescent material,and the color transition is repeatable and reversible.Analyzing the modulation mechanism of above mentioned methods will be conductive to understand the nature of Er^(3+) UC emission spectrum control,and build the solid base for designing new optical control methods.

关 键 词：光谱调控 上转换 铒离子 发光材料 

分 类 号：O437[机械工程—光学工程] TB565.1[理学—光学]