Synthesis and luminescence properties of KCaPO4:Eu2+,Tb3+,Mn2+ for white-light-emitting diodes (WLED)

In order to obtain a single-host white-light phosphor, a series of KCaPO4 powder samples tri-doped with Eu2+, Tb3+ and Mn2+ were synthesized via high-temperature solid-state reaction method. Their structural and luminescence properties were investigated. Under proper ultraviolet excitation (255–405 nm), white light was obtained, consisting of blue, green and red emissions stemming from Eu2+, Tb3+, Mn2+ ions respectively. The temperature stability of our sample was analyzed by studying the variation tendency of CIE chromaticity coordinates at different temperatures. The results indicated that this phosphor could yield good color stability when utilized in WLED.

Variation tendency between CIE chromaticity coordinate points and the temperature for sample KCaPO4:7%Eu2+, 7%Tb3+,2%Mn2+ under 355 nm excitation, with temperature changing from room temperature to 570 KFigure optionsDownload full-size imageDownload as PowerPoint slide