Characterization and properties of green-emitting β-SiAlON:Eu2+ powder phosphors for white light-emitting diodes -: art. no. 211905

This letter reports a beta-SiAlON:Eu2+ green phosphor with the composition of Eu0.00296Si0.41395Al0.01334O0.0044N0.56528. The phosphor powder exhibits a rod-like morphology with the length of similar to 4 mu m and the diameter of similar to 0.5 mu m. It can be excited efficiently over a broad spectral range between 280 and 480 nm, and has an emission peak at 535 nm with a full width at half maximum of 55 nm. It has a superior color chromaticity of x=0.32 and y=0.64. The internal and external quantum efficiencies of this phosphor is 70% and 61% at lambda(ex)=303 nm, respectively. This newly developed green phosphor has potential applications in phosphor-converted white LEDs. (c) 2005 American Institute of Physics.