Effect of phonon energy on 2 μm emission in Tm3+/Yb3+ co-doped bismuth-tellurite glasses based on WO3 or B2O3 adjustment

• Published in: Journal of luminescence 2023-03, Vol.255, p.119610, Article 119610
• Main Authors: Song, Chunlai, Xu, Pengfei, Zhou, Dechun, Zhang, Kexin, Ma, Bei, Cong, Yuxuan, Bai, Yuerong, Cao, Jilong, Han, Kexuan
• Format: Article
• Language: English
• Subjects: 2 μm laser; Bismuth-tellurite glass; Phonon energy; Tm3+/Yb3+ co-doped
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2022.119610

Tm3+/Yb3+ co-doped TeO2–Bi2O3–ZnO glass has been synthesized by using the melt-quenching method in this paper. According to Gaussian fitting and J-O theory, the impact of phonon energy on both structure and fluorescence properties has been investigated by introducing different phonon energy oxides. It was shown that various glass network units were observed in Raman spectra. Moreover, the Te–O–Te can be destroyed via the addition of WO3 and B2O3, resulting in [TeO4] transformed to [TeO3] and [TeO3+δ] groups, while thermal stability and fluorescence properties were enhanced. And the phonon energy (ħω0) increased from 758 to 926 (WO3) and 1097 cm−1 (B2O3). Meanwhile, the intensities of the absorption and fluorescence spectra were improved significantly by the change of glass network units. The effective fluorescent bandwidth (Δλeff) was raised from 223 to 227 and 231 nm, and the gain coefficient was from 1.60 cm−1 to 1.71 cm−1 and 1.72 cm−1. Finally, the micro-parameters for energy transfer processes have been calculated by using a spectral overlap method. Results indicate that the energy transfer process between Tm3+ and Yb3+ was more efficient with the high phonon energy oxide introduction (WO3 and B2O3), which provides practical significance that will be beneficial for obtaining the 2 μm high gain material. •Tm3+/Yb3+ co-doped 85 TeO2–5Bi2O3–10ZnO glass has been prepared with partial substitution of TeO2 by WO3 or B2O3.•The impact on the structure of bismuth-tellurite glasses has been investigated when introducing WO3 and B2O3.•The influence on spectroscopic properties of Tm3+/Yb3+ co-dopedtellurite glasses has been characterized by WO3 and B2O3.•The energy transfer process has been analyzed between Tm3+ and Yb3+ based on different phonon energy at the 2 μm.