Luminescence and optical properties of sodium germanate glasses doped with Sm3+ ions

• Published in: Materials research bulletin 2022-09, Vol.153, p.111905, Article 111905
• Main Authors: Duan, Yangyinyi, Li, Xiangping, Shen, Rensheng, Zhang, Yuhang, Wang, Xin, Guan, Zhipeng, Wang, Ke, Cao, Yongze, Zhang, Xizhen, Chen, Baojiu
• Format: Article
• Language: English
• Subjects: Judd-Ofelt theory; Luminescence property; Luminescence thermal stability; Optical transition property; Sm3+ doped sodium germanate glass
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2022.111905

•Luminescence property of Sm3+ doped sodium germanate glasses was investigated.•Optical transition property of Sm3+ in GNS glasses was studied.•Suitable glass composition with optimum Sm3+ concentration was obtained.•Sm3+ doped GNS glasses exhibit excellent luminescence thermal stability. Sm3+ doped sodium germanate glasses were synthesized by high temperature melt-quenching technique, suitable glass composition with optimum Sm3+ concentration and good luminescence thermal stability was obtained. The luminescence performance of Sm3+ and its optical transition property in glasses were studied. The optical transition intensity parameters of Sm3+ were calculated according to Judd-Ofelt theory. According to Huang's model and Dexter's model, it was confirmed that the electric dipole-dipole interaction among Sm3+ was responsible for the concentration dependent luminescence quenching of 4G5/2 level of Sm3+. Temperature dependent luminescence characteristics of Sm3+ was also investigated, and the luminescence thermal quenching behavior was found. When the temperature was 423 K, the emission intensity of the sample can still maintain 90% of that at room temperature. The result showed that this kind of red-emitting glass phosphor had an excellent luminescence thermal stability. When the temperature reaches 423 K, the emission intensity of Sm3+ still maintains 90% of that at room temperature, and even if the temperature rises to 693 K, the emission intensity of Sm3+ decreases by only about 30%. The color coordinates of Sm3+ in GNS glass change slightly with the increase of temperature. The results demonstrated that GNS fluorescent glass has excellent luminescence thermal stability and could meet the requirements of high working temperature environment for phosphor-converted lighting devices. [Display omitted]