Wavelength Tailorability of Broadband Near-Infrared Luminescence in Cr~(4+)-Activated Transparent Glass-Ceramics

摘要

Four Cr~(4+)-activated transparent glass-ceramics containing different species of silicate nano-crystals (Zn_2SiO_4, Mg_2SiO_4, Li_2ZnSiO_4, and Li_2MgSiO_4) were successfully prepared. Absorption spectra, photoluminescence spectra, lifetime decay curves, and quantum yield of these transparent glass-ceramics were measured. According to the crystal field strength of Cr~(4+)-incorporated tetrahedral sites, the broadband near-infrared (NIR) luminescence of Cr~(4+) can be tailored from 1130 to 1350 nm and the lifetime of Cr~(4+) luminescence can be prolonged from 6 to 100 μs. Quantum yield in the transparent glass-ceramics containing Li_2ZnSiO_4 nano-crystals reached at 17%, which is the highest value of NIR luminescence in transition-metal-activated glass materials.