可调白光发射的Ce-Tb-Eu共掺钙硼硅酸盐发光玻璃

采用高温熔融法制备了Eu单掺和Ce-Tb-Eu共掺的钙硼硅酸盐发光玻璃。使用荧光分光光度计测量了样品的发射与激发光谱,并通过激发、发射光谱和CIE色度坐标对其发光特性进行了研究。结果表明:改变玻璃基质提高其光学碱度,可以大幅度增加Eu³⁺/Eu²⁺比例,增强Eu³⁺的红光发射。在378 nm单色光激发下,Ce-Tb-Eu共掺发光玻璃的发射光谱中同时观测到了蓝光、绿光和较强的红光特征峰。通过调节Tb、Eu的比例,可以使样品发射光谱的色坐标在白光区域内变化,实现白光调控。

Tunable White Emitting in Ternary Ce-Tb-Eu Co-doped Calcium-borosilicate Glasses

Eu single doped and Ce-Tb-Eu co-doped calcium-borosilicate glasses were fabricated by high temperature melting technique. The luminescence properties were investigated by excitation and emission spectra. The emission intensity ratio of Eu²⁺ to Eu³⁺ decreased gradually with the increase of optical basicity of the glass matrix. Under 378 nm excitation, blue, green and red emission bands were simultaneously observed at 430, 488, 542 and 612 nm, respectively. By increasing the concentration of Tb³⁺, a shift of CIE color coordinates from blue to green was observed, and by increasing the concentration of Eu³⁺, a shift of CIE color coordinates from blue to red was observed. A complex bright white light emitting was obtained with CIE(0.31,0.31) when n(Ce):n(Tb):n(Eu)=0.25:0.25:0.5.