Abstract
Er3+/Yb3+ 共掺的碲酸盐玻璃由于其良好的上转换发光性能而得到广泛的研究。本文将氟化物引入碲酸盐玻璃中, 通过熔融法制备了量比为70TeO2-(30-x)ZnO-xZnF2-0.15Er2O3-1.5Yb2O3(x=0,5,10,15,20)的碲酸盐氧氟玻璃样品, 并测试其热稳定性、拉曼光谱以及受激发射光谱。实验结果表明, 随着氟化物含量的提高, Er3+离子的410,555,670 nm上转换发光和2~3 μm波段中红外发光得到增强, 并且红光提高强度比绿光和蓝光更明显。在分析了氟离子引入后对上转换与近中红外波段发光的内在影响机制发现: 碲酸盐玻璃系统中的氟化物一方面促进能量传递过程中Er3+离子的双光子吸收, 促进粒子跃迁至相应的高能级; 另一方面, 引入氟化物后的碲酸盐玻璃的最大能量声子态密度下降也是降低无辐射跃迁概率、提高上转换和中红外发射强度的重要原因。
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