KGdF_(4):Tb^(3+)绿色荧光粉的合成及其负热猝灭效应

Synthesis of KGdF_(4):Tb^(3+) Green Emitting Phosphors and Its Negative Thermal Quenching Effect

通过水热合成法制备了一系列具有发光负热猝灭的KGdF_(4):Tb^(3+)绿色荧光粉,并通过XRD进行了晶体结构分析,SEM观察形貌,EDS分析元素组成,荧光光谱(PLE&PL)分析常温发光性能和温度依赖性发光。基于光谱分析结果,样品的最强吸收峰在377 nm处,最强发射峰位于541 nm,KGdF_(4):0.3Tb^(3+)发光具有负热猝灭现象;在测试温度范围内(35~295℃),样品的发光强度随温度的升高而增强,在195℃和215℃时的积分发光强度分别为35℃时的194.3%和214.9%。KGdF_(4):0.3Tb^(3+)优异的高温性能表明其在WLEDs中具有广阔的应用前景。

A series of KGdF_(4):Tb^(3+) green phosphors with negative thermal quenching were prepared by hydrothermal synthesis and the optimal sample was KGdF_(4):0.3Tb^(3+).For the optimal sample,the crystal structure was analyzed by XRD,the morphology was observed by SEM,the element composition was analyzed by EDS,and the luminescence performance and temperature dependent emission were analyzed by PLE&PL.Based on the spectral analysis results,the strongest absorption peak of all samples is 377 nm and the strongest emission peak is 541 nm.Furthermore,there is negative thermal quenching phenomenon for the optimal sample KGdF_(4):0.3Tb^(3+).In the range of testing temperature(35℃-295℃),for the optimal sample,the luminous intensity is more and more strong as the rise of temperature,and the integrated luminescence intensities at 195℃and 215℃are 194.3%and 214.9%comparing that at 35℃,respectively.The excellent high temperature performance indicates that KGdF_(4):0.3Tb^(3+) has a broad application prospect in WLEDs.