Single-phased white-light-emitting Ca-4(PO4)(2)O:Ce3+,Eu2+ phosphors based on energy transfer
Journal
Dalton Transactions
Journal Volume
44
Journal Issue
25
Pages
11399-11407
Date Issued
2015
Author(s)
Jia, Yonglei
Pang, Ran
Li, Haifeng
Sun, Wenzhi
Fu, Jipeng
Jiang, Lihong
Zhang, Su
Su, Qiang
Li, Chengyu
Abstract
A novel single-composition Ca4(PO4)2O:Ce(3+),Eu(2+) phosphor emitting white light was synthesized by conventional solid-state reaction for light-emitting diode applications. X-ray diffraction, photoluminescence spectra, and luminescence decay spectra were used to characterize the samples. Energy transfer from Ce(3+) to Eu(2+) ions was observed in the co-doped samples, and the transfer mechanism in the Ca4(PO4)2O:Ce(3+),Eu(2+) phosphors was dipole-dipole interaction. The emission hue of Ca4(PO4)2O:Ce(3+),Eu(2+) was found to vary from blue (0.165, 0.188) to white (0.332, 0.300) and eventually to orange (0.519, 0.366) by precisely controlling the ratio of Ce(3+) to Eu(2+). The combination of a 380 nm near-ultraviolet chip with a Ca4(PO4)2O:0.02Ce(3+),0.012Eu(2+) phosphor produced a diode emitting white light with ultra-wideband emission and a correlated color temperature of 4124 K. Overall, results indicated that the prepared samples may be potentially applied in white-light-emitting diodes.
SDGs
Type
journal article