磁场诱导的铒化合物发光巨增强效应在精细能级探测中的应用研究

The photoluminescence (PL) intensity of erbium doped compounds in visible and near infrared emissions evolves regularly with magnetic field, and shows strong excitation energy dependence and temperature sensitivity, which has important applications in magneto-PL enhancement, temperature sensor, fine energy level detection and so on. Recently, the phonon assisted magneto-PL enhancement in Er3+:YVO4 and Er3+:GdVO4 crystals under magnetic fields was found to be closely correlated with its fine absorption level. More and more unknown fine levels and novel luminescence properties of rare earth materials will be revealed by fine level detection with the magneto-PL enhancement effect. This proposal will investigate the evolution between different fine absorption energy level and magneto-PL emission in Er3+ doped crystals under strict excitations with magneto-optical PL and absorption measurement setups, and explore the evolution of phonon-assisted PL enhancement with temperature and magnetic field scanning. Crystal field theory with magneto-parameters will be used to do numerical calculations of the fine energy states. The achievement of goal in the project will not only reveal the relationship between magneto-PL enhancement effect and the fine energy levels, but also promote the application of magneto-PL (or absorption) enhancement based fine levels detection for rare-earth luminescent materials.

磁场诱导铒掺杂化合物在可见光和近红外波段发光强度的变化具有严格的规律性，且呈现出很强的激发能量依赖及温度敏感等特性，在磁控发光增强、温度传感和材料能级探测等领域有重要应用。申请者近期在铒掺杂钒酸镱和钒酸钆晶体中观测到的声子辅助磁致发光巨增强效应，呈现出极强的精细吸收能级相关性。利用这种磁光效应探测材料精细能级，将揭示稀土材料更多未知精细能级和新奇发光特性。本项目将利用脉冲强磁场下吸收和光致发光测量系统，优选研究精细激发条件下，铒掺杂晶体材料不同波段的吸收能级与磁场诱导发光增强的对应关系，指认其精细能级；通过磁场和温度二维扫描方式，研究声子辅助发光增强的精细能级依赖特性，修正磁致发光增强对应的材料精细能级参数；并利用含磁场参量的晶体场理论模型逆向分析，综合确定材料的精细能级位置。本项目研究将揭示磁场增强发光效应与材料精细能级的索引关系，推广磁致发光（或吸收）增强在材料精细能级探测中的应用。

项目负责人在铒掺杂钒酸镱和钒酸钆晶体中观测到的声子辅助磁致发光巨增强效应，呈现出极强的精细吸收能级相关性。利用这种新颖的磁光效应探测材料精细能级，可以揭示稀土材料更多未知精细能级和新奇发光特性。本项目利用脉冲强磁场下吸收和光致发光测量系统，采用Litterow外腔半导体激光器，研究了精细激发条件下，铒掺杂晶体材料不同波段的吸收能级与磁场诱导发光增强的对应关系，指认了其精细能级；通过磁场和温度二维扫描方式，研究了声子辅助发光增强的精细能级依赖特性，修正磁致发光增强对应的材料精细能级参数；并利用含磁场参量的晶体场理论模型逆向分析，综合确定材料的精细能级位置。本项目研究不仅揭示了磁场增强发光效应与材料精细能级的索引关系，还推广了磁致发光（或吸收）增强效应，在稀土掺杂材料的精细能级探测中的应用。