OAM-RC

Abstract

High brigh tness fine SrAl 2 O 4 : Eu 2+2+, Dy 3+ phosphors were prepared by gel casting and solid state reaction process using 1:1 ratio of Al 2 O 3 and SrCO 3 as the starting materials. Scanning electronic microscope (SEM) morphology shows that the specimens presintered or sin tered by different temperatures have uniform grain size and pores. The resultant powders ground by ball milling for 24 h were around 1 μm from t ransmission electronic microscope (TEM) photograph . The wide range of excitation spectrum of the phosphors indic ates that the luminescent materials can be excited by light from ultraviolet ray to visible light and the maximum emission wavelength of the phosphors is found mainly at λ em of 520 nm, the corresponding colors of emission light are green. The afterglow dec ay tendency of phosphors can be summarized as three processes : initial rapid decay, intermediate transitional decay and very long slow decay. Afterglow decay curves coincide with formula I=At n.

Keywords

Phosphor, Sintering, Gel casting, Solid state reaction, SrAl2O4:Eu, Dy.

Citation

ZHENJUN ZHOU, WEIHUA LUO, BIN LÜ, XUEQIAN WU, Synthesis of high-brightness fine SrAl2O4: Eu, Dy phosphor by gel-casting and solid-state reaction process, Optoelectronics and Advanced Materials - Rapid Communications, 5, 2, February 2011, pp.125-127 (2011).

Submitted at: Jan. 25, 2011

Accepted at: Feb. 17, 2011