Photoluminescence properties of singly doped Tm3+ and co-doped Tm3+/Tb3+ ions in tellurite glasses

• Tm3+/Tb3+ co-doped tellurite based glasses are prepared by melt quenching technique.
• Tm3+/Tb3+ ions doped glasses emit intense bluish green color.
• Co-doping with Tb3+ ions will enhance the emission at 1.8 μm of Tm3+ ions.

Photoluminescence properties of singly doped Tm3+ and co-doped Tm3+/Tb3+ ions in TZKC glasses with chemical composition of (61.5−x) TeO2 + 25 ZnO + 8 K2O + 5CaO + 0.5Tm2O3 + xTb4O7 (TZKCTm05Tbx; x (in mol%) = 0, 0.5, 1.0, 1.5) have been studied. The experimental oscillator strengths of absorption bands in TZKCTm05 glass were used to determine the host dependent Judd–Ofelt Ω2, Ω4, Ω6 intensity parameters. The effective emission cross-section of 1.8 μm emission band as a function of wavelength has been deduced by the McCumber’s theory. Based on the absorption (σa) and emission cross-sections (σe), the gain co-efficients (G) of 1.8 μm emission band for various population inversions between the emitting (3F4) and terminating (3H6) levels were evaluated. From the photoluminescence spectra of singly doped Tm3+ and co-doped Tm3+/Tb3+ ions in TZKC glasses, the chromaticity color coordinates (x, y) were estimated.

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