Effect of Tb3+ ion concentration on the up-conversion and down-conversion luminescence properties of the Yb3+/Ho3+/Tb3+ tri-doped SiO2–Al2O3–Y2O3–NaF–CaF2 glasses

Abstract Yb3+-Ho3+-Tb3+ co-doped SiO2–Al2O3–Y2O3–NaF–CaF2 glasses were prepared. The XRD of the glass was obtained, which proved the amorphous state of the glass. The crystallization temperature of glass was measured by differential scanning calorimetry, and the crystallization activation energy was obtained. The absorption spectrum of glass was investigated. The network structure of glass was studied. The up-conversion and down-conversion spectra of the glass were obtained under 980 nm and 369 nm excitation, respectively, and the fluorescence decay lifetime of Tb3+: 5D4 was measured. The influence of laser power on up-conversion luminescence intensity was investigated by changing the laser power. The energy transfer relationship among Yb3+, Ho3+, and Tb3+ was researched. The CIE chromaticity coordinate was calculated according to the emission spectrum. It shows that this series of glasses have possible applications in the field of the green light display.