Yang Yanmin

Investigation of Modification Effect of B2O3 Component on Optical Spectroscopy of Er3+ Doped Tellurite Glasses

Abstract To investigate the modification effect of the B 2 O 3 component on tellurite glass, a series of glasses with a composition of xB 2 O 3 -(80- x )TeO 2 -10ZnO-10Na 2 O ( x = 0, 10, 20, 30, 40, 50, 60, 70, 80) and an additional amount of 0.5% Er 2 O 3 (in molar) were prepared. The refractive index, the absorption edge of the host, the J-O parameters of Er 3 +, the fluorescent decay time, the bandwidth, and the quantum efficiency for the 4 I 13/2 → 4 I 15/2 transition were obtained theoretically and experimentally. These results indicated that the introduction of B 2 O 3 modified the performance of the tellurite glass. For example, with increasing content of B 2 O 3 , the refractive index of the host decreases from 1.9 to 1.5, the absorption edge of the host shifted toward the blue regime, the intensity parameter Ω 6 changed from 1.08 × 10- 20 (for the pure tellurite glass) to 1.98 × 10- 20 cm 2 (for the pure borate glass), the bandwidth of the 4 I 13/2 → 4 I 15/2 transition increased, and the quantum efficiency of the 4 I 13/2 → 4 I 15/2 transition decreased.

Photoluminescence characteristics of Gd2Mo3O9 : Eu phosphor particles by solid state reaction method

Abstract Eu 3+ -doped Gd 2 Mo 3 O 9 was prepared by solid-state reaction method using Na 2 CO 3 as flux and characterized by powder X-ray diffractometry. According to X-ray diffraction, this material belonged to a tetragonal system with space group I 4 1 / a . The effects of flux content and sintering temperature on the luminescent properties were investigated with the emission and excitation spectra. The results showed that flux content and sintering temperature had effects on the luminescent properties, the optimized flux content and the best temperature was 3% and 800°C, respectively. The excitation and emission spectra also showed that this phosphor could be effectively excited by C-T band (280 nm), ultraviolet light 395 nm and blue light 465 nm. The wavelengths at 395 and 465 nm were nicely fitting in with the widely applied output wavelengths of ultraviolet or blue LED chips. Integrated emission intensity of Gd 2 Mo 3 O 9 : Eu was twice higher than that of Y 2 O 2 S:Eu 3+ under 395 nm excitation. The Eu 3+ doped Gd 2 Mo 3 O 9 phosphor may be a better candidate in solid-state lighting applications.