$\text{Tb}^{3+}$-GeSbGaSe glass-ceramics for creation of mid-IR radiation sources

An increase in photoluminescence at a wavelength of $5\ \mu\mathrm{m}$ in glass-ceramics based on $\text{Tb}^{3+}$ -doped $\text{Ge}_{33}\text{Sb}_{3}\text{Ga}_{4}\text{Se}_{60}$ glass with nucleated and grown micro- and nanosized GeSe crystals is reported. Depending on the heat treatment temperature of the glass, an increase in luminescence by a factor of 1.5-4 is achieved. The mechanisms of luminescence enhancement and the influence of optical scattering losses on it are discussed.