A single Mn2+ ions activated fluosilicate glass with continuously tunable broadband emission from 475 nm to 800 nm

Abstract

Broadband phosphor-converted light-emitting diodes are replacing the conventional light sources in spectroscopy application owning to the high efficiency, long lifetime, and compactness. However, the broadband emission originated from multi-component phosphors exhibits low quantum efficiency (QE) and poor thermal stability. Herein, a single Mn2+ ions activated fluosilicate (SF) glass, with broadband emission from 475 nm to 800 nm and good thermal conductivity (2.3 W/m·K), was presented. Their optical properties, structural characteristics and thermal performances were investigated through UV/VIS/NIR spectrophotometer, fluorescence spectrometer, Raman system, as well as thermal analyzer. The results show that continuously tunable broadband emission from green to orange, enhanced QE from 27.9% to 43.8%, and improved thermal stability (increasing Tg from 546°C to 665°C and decreasing thermal quenching) were achieved by increasing the Y2O3 content of SF glass composition. All of those investigations provide a new approach for exploring a continuously tunable broadband emission based on single-component phosphor with one activator.