Spectroscopic properties and thermal stability of Er3+-doped germanate–borate glasses

Multicolor upconversion luminescence from RE3+-Yb3+ (RE=Er, Tm, Tb) codoped LaAlGe2O7 glasses

“…The LAG glass has relatively high T g and T x which shows the good thermal stability of the host glass. The high density and index of refraction are also consistent with other heavy metal oxide glasses [15][16][17][18]. The absorption and Fourier transform infrared spectra of blank LAG glass are shown in Fig.…”

Violet and visible up-conversion emission in Yb3+–Ho3+ co-doped germanium-borate glasses

“…According to the above conclusion, excited state absorption (ESA) and energy transfer (ET) both play an important role. As B 2 O 3 concentration increases the phonon energy of glass host is increased accordingly, which has been reported in our previous paper [11]. The Ho 3 + ions quantities relaxing nonradiatively to 5 I 7 level from 5 I 6 level increases by multi-phonon relaxation.…”

“…However, non-resonant excitation processes need phonon energy to provide assistance and too lower phonon energy may make against non-resonant excitation and thereby reduce up-conversion emission in certain levels. Due to low phonon energy (800 cm À 1 ) of germanium glass and high phonon energy (1400 cm À 1 ) of borate glass, we can modulate the phonon energy in germanium-borate glasses by changing the ratio of the two compositions [11].…”

Thermal, mechanical, and upconversion properties of Er3+/Yb3+ co-doped titanate glass prepared by levitation method

“…Furthermore, the value of T = T c − T g , which is often an important parameter to characterize the glass forming ability [25] has also be calculated. The calculated T of present TLZ glass is 75 • C. This value is much lower than those of most traditional oxide glasses such as silicate or borate glass systems [26,27], and even lower than those of some heavy metal oxide glasses [28,29]. The result indicates a comparatively poor glass forming ability of the TLZ glass.…”