研究了由重金属氧化物Bi2O3-GeO2-PbO 组分高温融熔而成的铋锗酸盐玻璃中稀土掺杂铒离子(Er3+)的吸收光谱、上转换发光谱以及玻璃基质的红外吸收谱，着重分析了975 nm 和800 nm 泵浦光激励下Er3+离子的上转换发光机理。结果表明，在975 nm 或800 nm 泵浦光激励下，观察到了绿光(529 nm、552 nm)和红光(667 nm)发射，分别对应于Er3+离子2H11/2→4I15/2、4S3/2→4I15/2 和4F9/2→4I15/2 能级间的辐射跃迁，且均为双光子吸收过程。相对于800 nm 波长激励，采用975 nm 波长激励可以获得更高的上转换发光强度。两种激励情形下绿光上转换发光强度都要明显大于红光上转换发光强度，说明铋锗酸盐玻璃适合于作为绿光上转换光纤激光器的基质材料。

The absorption spectrum, upconversion fluorescence spectrum and infrared absorption spectrum of Er3+-doped bismuth-germanate glass, which was prepared by conventional high-temperature melting-annealing method with the heavy metal oxide composition of Bi2O3-GeO2-PbO, are investigated, and the research focus is on the upconversion fluorescence mechanisms of Er3+ under the 975 nm and 800 nm laser excitation. The results show that the green and red emission centered around 529 nm, 552 nm and 667 nm, corresponding to the 2H11/2→4I15/2、4S3/2→4I15/2 和4F9/2→4I15/2 transitions of Er3+, respectively, are simultaneously observed under the 975 nm and 800 nm laser excitation. A two-photon upconversion process is assigned to the green and red emission. Compared to the 800 nm laser excitation, a more intense upconversion fluorescence can be obtained under the 975 nm laser excitation, and the green emission intensity is greater than that of the red emission, which indicates that the bismuth-germanate glass is a more promising glass host material applied to the green upconversion.