电子俘获材料ZnS:Cu,Pb,Mn发光机理研究

Luminescence Mechanism of Electron Trapping Material ZnS:Cu,Pb,Mn

对电子俘获材料ZnS:Cu,Pb,Mn作了XRD分析,并测试了材料的荧光谱、荧光激发谱、红外激励发光谱、红外激励谱、荧光余辉衰减曲线等光谱特性。结果显示:材料为六方晶系ZnS单相;可受460nm以下的紫外及可见光激发;红外响应范围为(700—1600)nm;荧光和红外激励发光的峰值波长在490nm和580nm。根据光谱特性对ZnS:Cu,Pb,Mn的上转换发光机理进行了探讨,提出了ZnS:Cu,Pb,Mn的上转换发光机理能级模型,并结合模型对材料的激发和激励过程作了具体的分析。

Electron trapping material ZnS ： Cu, Pb, Mn were analyzed by XRD, and the optical properties were measured. The measurement included fluorescence spectrum, fluorescence excitation spectrum, infrared stimulated luminescence spectrum, infrared stimulation spectrum and afterglow decay curve. The results indicate that, the phosphor is single phase ZnS and possessed hexagonal crystal structure. The light from UV to 460 nm visible could excite and charge the sample. The IR sensitivity spectrum is in the range of （700--1 600） nm. Both the fluorescence spectrum and the infrared stimulated luminescence spectrum have two peaks corresponding to 490 nm and 580 nm. According to the results, the mechanism of infrared up-conversion luminescence is discussed. The energy level model of up-conversion luminescence mechanism is proposed, and the process of excitation and stimulation is analysed concretely.