Tb/Eu 共掺锌硼磷酸盐白光发光玻璃的制备及其发光性能

采用熔体冷却法，通过控制玻璃基质组成及稀土离子添加量，制备了Tb、Eu单掺和Tb/Eu共掺的锌硼磷酸盐低熔点发光玻璃。测试了样品的红外光谱、吸收光谱、激发与发射光谱和荧光寿命，并计算CIE色坐标，研究了材料的微观结构及发光性能。结果表明：样品中部分Eu³⁺被还原为Eu²⁺，在380 nm波长激发下，Tb/Eu共掺发光玻璃同时出现Eu³⁺红光、Tb³⁺绿光和Eu²⁺蓝光的特征发射。增加基体中B₂O₃含量能强化玻璃网络结构，并改变Eu²⁺/Eu³⁺比例。发射光谱和荧光寿命测试表明，共掺的发光玻璃中存在Eu²⁺→Eu³⁺，Eu²⁺→Tb³⁺和Tb³⁺→Eu³⁺的能量传递。改变Tb、Eu的掺杂浓度能够有效改变发光玻璃的发光强度和颜色，最终得到色坐标为（0.318 7，0.286 1）、色温6 480 K的发光玻璃。

Synthesis and Luminescent Properties of Tb/Eu Co-doped Zinc Borophosphate Glasses for White Light Generation

Tb/Eu co-doped zinc borophosphate glasses were successfully synthesized by melt quenching method. The effect of glass matrix composition and rare erath ions concentration were discussed. The structural and luminescent properties were characterized by Fourier transform infrared (FT-IR) spectra, absorption spectra, photoluminescence(PL) spectra, fluorescence lifetimes and colorimetric analysis. Eu³⁺ ions were partly reduced to Eu²⁺ during the synthesization in air. Under 380 nm excitation, white light emission was observed composited by emission at 612 nm and 590 nm for Eu³⁺, 544 nm and 488 nm for Tb³⁺, and 430 nm for Eu²⁺. The FT-IR spectra showed that the structure of glass matrix changed when B₂O₃ content increased, which affected the Eu²⁺/Eu³⁺ ratio in glass samples. The spectra results show that Eu²⁺ ions are donors which can transfer energy to Eu³⁺ and Tb³⁺. Lifetime analysis proved that Tb³⁺ ions can transfer energy to Eu³⁺ through nonradiative transition. The luminescence intensity and emission color can be efficiently controlled by changing glass composition and rare earth ion concentration. Optimized white light with CIE(0.3187, 0.2861) and correlated color temperature at 6 480 K was obtained when the mole fractions of Eu and Tb were both 1.5%.