Ce³⁺对YPO₄:Tb³⁺,Ce³⁺微米球的发光调制及Tb³⁺与Ce³⁺间的能量传递

高永毅¹，占世平¹，钟 慧²

(1. 湖南科技大学 物理与电子科学学院，湘潭 411201；
2. 湖南科技大学 机电学院，湘潭 411201)

摘 要：以尿素为螯合剂、十二烷基硫酸钠(K12)为表面活性剂，采用水热法合成YPO₄:Tb³⁺,Ce³⁺微米球。利用SEM、XRD、光致发光光谱、激发谱、荧光衰减曲线等分析手段对YPO₄:Tb³⁺,Ce³⁺微米球的形貌、相结构、光学特性及相关激发与发射机制进行研究。结果表明：合成的YPO₄:Tb³⁺,Ce³⁺微米球荧光颗粒形貌规则，呈纯净四方相。共掺Ce³⁺离子使得微米球的544 nm绿光发射的相对强度得到有效调制；对荧光衰减谱的双参数拟合，证实Ce³⁺与Tb³⁺之间能量传递的存在。

关键词：Ce³⁺；Tb³⁺；荧光颗粒；敏化；交叉弛豫；双参数拟合；衰减曲线

Tuning of Ce³⁺ doping on emissions of YPO ₄:Tb³⁺, Ce³⁺ microspheres and energy transfer between Ce³⁺ and Tb³⁺

GAO Yong-yi¹, ZHAN Shi-ping¹, ZHONG Hui²

(1. College of Physics and Electronic Science, Hunan University of Science and Technology,
Xiangtan 411201, China;
2. College of Mechanical and Electrical Engineering, Hunan University)

Abstract:The YPO₄:Tb³⁺,Ce³⁺ microspheres were synthesized through hydrothe, rmal method by using urea as chelatingagent and sodium dodecylsulfate (K12) as surfactant. The morphology, phase structure, optical property and relative excitation and emission mechanism of YPO ₄: Tb³⁺,Ce³⁺ microspheres were characterized by scanning electron microscopy (SEM), X-ray diffractometry (XRD), photoluminescence (PL) excitation spectra and decay spectra technique. The results reveal that the synthesized microspheres show uniform morphologies and pure tetragonal phase of YPO₄. The relative intensity of 544 nm green emission of Tb³⁺ to other emission bands can be efficiently tuned by codoping Ce³⁺. Finally, the energy transfer was confirmed to occur between Ce³⁺ and Tb³⁺ when the decay spectra of Tb³⁺ is fitted by a double-exponential function by fitting the decay spectra.

Key words:Ce³⁺; Tb³⁺; fluorescent particles; sensitization; cross-relaxation; double-exponential fitting; decay-curve