Controlled growth and up-conversion luminescence of Y2O2S : Er3+ phosphor with the addition of Bi2O3
Abstract
By adding Bi2O3 in phosphor raw materials, fine particles (ca. 500 nm in diameter) have been synthesized for the first time in Y2O2S : Er3+via high-temperature solid-state reaction. The influence of Bi2O3 content on the crystal growth and up-conversion (UC) luminescence (excited at 1550 nm) of Y2O2S : Er3+ phosphors was investigated by varying the Bi2O3 concentration from 0 to 10.0 mol%. As Bi2O3 concentration was increased, the average particle size was increased and then decreased, and the uniformity of the particle size was descended and then enhanced. The size change of Bi2O3 doped Y2O2S : Er3+ phosphors can be well explained by the liquid phase sintering mechanism. Compared to the phosphors without containing any Bi2O3, UC luminescence intensity (excited at 1550 nm) of phosphors containing Bi2O3 decreased, but was still sufficiently strong to the naked eye.