Energy transfer controlled color-tunable luminescence of Tm3+/Dy3+ co-doped aluminoborosilicate glass-ceramics

Tm3+/Dy3+-doped glass ceramic (GC) phosphors containing Al4B2O9 nanocrystallites were prepared by isothermal heat-treatment of aluminoborosilicate glass and the structure, optical properties were characterized. The GCs with Tm3+/Dy3+ luminescent center incorporated in the lattice of Al4B2O9 nanocrystals reveal notable energy transfer from Tm3+ to Dy3+ and possess comparable thermal stability. The luminescence emission shift from cool white light to warm white light with increasing concentration ratio of Dy3+/Tm3+ and crystallinity. With extending heat-treatment time, the luminescence emission of GC increase firstly followed by decline in addition that the energy transfer efficiency increases whereas contrarily the lifetime decreases. Crystallization induced Dy3+/Tm3+ penetrating Al4B2O9 is proposed to enhance the ligand field environment at luminescence center and further the energy transfer from Tm3+ to Dy3+. By adjusting concentration ratio of Dy3+/Tm3+ and the heat-treatment time, The doped GC phosphor with suitable chromaticity coordinate and prominent fluorescence potential for white light-emitting applications can be achieved.