Abstract: The goal of this dissertation is mainly to search for glass hosts suitable for broadband fiber amplifiers, blue and green lasers. This research on spectral properties and crystallization stability of Er3+-doped heavy metal oxyfluoride glasses and upconversion luminescence of rare earth-doped heavy metal oxyhalide glasses lay a foundation for the potential use of broadband Er3+-doped fiber amplifier, blue and green lasers. The results showed that the bandwidth properties and gain performance of Er3+-doped silicate and germanate glasses increase due to addition of heavy metal lead fluoride, upconversion blue emission in Er3+/Yb3+-codoped and Er3+-doped silicate glasses was observed for the first time, upconversion luminescence intensity of Er3+-doped germanate and tellurite glasses increase with increasing of heavy metal lead fluoride, upconversion blue, green and red emissions are corresponding to the 2H9/2→4I15/2, 2H11/2→4I15/2, 4S3/2→4I15/2, and 4F9/2→4I15/2 transitions of Er3+, respectively, were simultaneously observed at room temperature. Mixed lead halide modified Tm3+/Yb3+-codoped tellurite glasses are profitably improving crystallization stability of host glasses and upconversion luminescence, and upconversion blue and red emission are corresponding to the1G4→3H6 and 1G4→3H4 transitions of Tm3+, respectively, were simultaneously observed at room temperature. It was discovered for the first time that OH group absorption had important effect on upconversion emission of Er3+ and Tm3+ doped tellurite glasses.

Key words: heavy metal oxyhalide glasses, rare earth ions, spectral properties, upconversion luminescence