Effect of crystallization temperature on luminescence behaviour of Er–Yb: SrO·TiO2 borosilicate glass

Systematic investigation over Er3+/Yb3+ doped SrO·TiO2 borosilicate glass ceramics has been carried out to study the change in crystallization and luminescence behaviour with heat treatment temperatures. Nano-crystalline phases Sr3Ti2O7 and Ti10O19 were present in glass ceramics with heat treatment temperature 950 °C. Scanning electron microscope images showed that Sr3Ti2O7 particles (smaller) were distributed homogeneously and Ti10O19 particles (bigger) were embedded at some places. Intensity of upconversion emission with excitation radiation 976 nm in crystalline glass ceramic was many times that of glass. Energy transfer and excited state absorption, mechanisms, responsible for upconversion, were studied through power log dependence.