Thermal effects on light emission in Yb3+-sensitized rare-earth doped optical glasses

Energy transfer processes on both Er3+ ion concentration and excitation densities in Yb3+–Er3+ codoped LaF3 matrix

“…4A, the green upconversion emissions at both 519 and 539 nm are important only in sample 1 with lower Er 3+ concentration. The increase of 2 H 11/2 population has recently been reported [21] when a sample is heated from room temperature to 155 1C. It is clear that the phonon-assisted anti-Stokes excitation is responsible for transition from 4 S 3/2 to 2 H 11/2 .…”

Spectral variations and energy transfer processes on both Er3+ ion concentration and excitation densities in Yb3+–Er3+ codoped LaF3 materials

“…1 has been obtained.as the excited density varies from 0 to 700 mW. In Yb 3+ and Er 3+ codoped systems, it is usually known that the excited Yb 3+ mainly transfers its energy into 4 F 7/2 and 2 P 3/2 levels of a neighbor Er 3+ ion by APTE named after Auzel [15], as shown in Fig. 2A, the populations of excited-state levels 2 H 9/2 , 4 F 3/2 , 4 F 5/2 , 4 F 7/2 , 2 H 11/2 , 4 S 3/2 , and 4 F 9/2 in Er 3+ are accomplished through a series of nonradiative relaxation processes.…”

Luminescence studies of Sm3+ single-doped and Sm3+, Dy3+ co-doped NaGdTiO4 phosphors

“…However, the luminescence intensities of all the emission bands decrease with increasing temperature, implying thermal quenching occurs. Generally, both the energy transfer rate and the multiphonon non-radiative relaxation rate increase with the increase of sample temperature, which can result in the increase of the quenching probability of the emission level, and then inducing the luminescence intensity decreases [23,24]. To study the effect of sample temperature on the rates of energy transfer and non-radiative relaxation, temperature dependent fluorescence decay curves were measured at various temperatures.…”