基质对Tb3+单掺荧光玻璃发光性质的影响

采用高温熔融法制备了Tb³⁺单掺硼酸盐、硅酸盐和磷酸盐荧光玻璃和相应的玻璃基质。根据紫外-可见透射光谱计算了Tb³⁺在不同基质中从⁷F₆ 到⁵D₃和 ⁵D₄能级的实验振子强度，解释了不同基质中Tb³⁺发射光谱的变化原因。结果表明：因为对称性差，在磷酸盐玻璃基质中，Tb³⁺在542 nm和585 nm处的发射峰有劈裂现象。在硼酸盐和硅酸盐基质中，Tb³⁺ 的⁵D₃能级上的粒子通过交叉弛豫过程被倒空并转移到⁵D₄能级，故⁵D₃能级发光（413 nm和436 nm）不明显；在磷酸盐基质中，Tb³⁺的⁵D₃能级上的粒子数较少，没有交叉弛豫产生，故⁵D₃能级发光最强。在3种基质中，Tb³⁺从⁵D₄能级发射的特征峰489，542，585，620 nm的强度顺序是硼酸盐>硅酸盐>磷酸盐，与Tb³⁺在不同基质中从⁷F₆ 到 ⁵D₄能级的实验振子强度顺序一致。

Effect of Glass Matrix on Luminescent Properties of Tb3+ Doped Luminescence Glass

Tb³⁺ doped borate, silicate and phosphate glasses and glass matrixes were prepared by high temperature melting technology. According to the UV-Vis transmission spectra, the experiment oscillator strengths of Tb³⁺ from ⁷F₆ to ⁵D₃ and ⁵D₄ were calculated, and the luminescent properties of Tb³⁺ in different glass matrixes were explained. The results show that the 542 nm and 585 nm emissions of Tb³⁺ doped in phosphate glass have split into two peaks because of the poor symmetry. In borate and silicate glasses, the particles in ⁵D₃ energy level of Tb³⁺ have been emptied and moved to ⁵D₃ energy level because of the cross relaxation, so the emissions from ⁵D₃ energy level (413, 436 nm) are not obvious. In phosphate glass, ⁵D₃ energy level of Tb³⁺ has much fewer particles and no cross relaxation, so the emission from ⁵D₃ energy level is the strongest. The characteristic emission peaks of Tb³⁺ from ⁵D₄ energy level are 489, 542, 585 and 620 nm. In different glass matrixes, the order of their intensities from largest to smallest is borate, silicate and phosphate glass, which is consistent with the order of experiment oscillator strengths from ⁷F₆ to ⁵D₄.