研究目的

To explore the energy transfer from Gd3+ to Sm3+ ions in the tellurite glass and study their physical, optical and photoluminescence properties as well as study their orange emission characteristics.

研究成果

The five glass samples were co-doped by Gd2O3 and Sm2O3 in concentration series of 0 ≤ x ≤ 3 in mol %. The glass densities are shown linearity increasing trend with the value between 5.2701 - 5.3469 g/cm3 whereas the refractive index and the molar volume show the same trend. The absorption spectra of glass represent eight absorption bands. Furthermore, the absorption intensities increased with increasing of Gd2O3 concentration. These results show a higher absorption potentiality of zinc barium tellurite glass with more quantity of Gd3+ in glass. Judd-Ofelt parameters was investigated for 53.5TeO2 – 10ZnO – 35BaO – 1Sm2O3 – 0.5Gd2O3 glass showing Ω4 > Ω2 > Ω6 trend. Higher spectroscopic factor values (> 1) were obtained which are suitable for photonic devices manufacturing. Energy transfer phenomenon from Gd3+ ions to Sm3+ ions were observed in the present tellurite glasses. The excitation spectrum displays different four excited peaks from the ground state to various excited states of the Gd3+ and eight peaks of Sm3+ that obtained the emission wavelength at 604 nm with the highest peak of excitation spectra at 275 nm. The emission spectra were excited by two different excitation spectra with 275 and 406 nm. The spectra appear in four significant peaks together with the nominal peak at the longer wavelength. The viewed emission peaks at 563 nm, 604 nm, 646 nm, and 709 nm when excited by 275 nm. It also observed four emission peaks when using 406 nm wavelength for excitation glass sample. The decay curves were measured using an excitation wavelength of 275 nm by monitoring the emission wavelength at 604 nm. The increasing of the Gd3+ ion affect the decay curves. The CIE diagram confirms that these zinc barium tellurite glasses emit light in the orange region, which indicates that its potential for use in orange emitting material applications.

研究不足

The technical and application constraints of the experiments, as well as potential areas for optimization, were not explicitly mentioned in the paper.