Efficient red phosphors Na5Ln(MoO4)4:EEu3+ (Ln = La, Gd and Y) for white LEDs

Chongfeng Guo*, Fei Gao, Yan Xu, Lifang Liang, Frank G. Shi, Bohan Yan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Citations (Scopus)

Abstract

A class of red-emitting phosphors Na5Ln(MoO4) 4 : Eu3+(Ln = La, Gd and Y) have been synthesized by the sol-gel technique and their luminescent properties have also been investigated under the near-ultraviolet (n-UV) light. The excitation spectra of these phosphors show the strongest absorption at about 395 nm which matches well with the commercially available n-UV-emitting GaN-based LED chip. Their emission spectra show intense red emission at 618 nm due to the 5D 0-7F2 transition of Eu3+. The phosphor Na5Y1-xEux(MoO4) 4 shows the brightest red light among phosphors Na5Ln 1-xEux(MoO4)4 as the content of Eu3+ is fixed. In addition, the conditions for synthesis of these phosphors are also optimized, including annealing temperature and concentration of Eu3+ ions. While the Li+ or K+ ions are incorporated into Na5Eu(MoO4)4 to substitute for Na+ partially, effects on the luminescent properties and structures of phosphors have also been discussed in detail.

Original languageEnglish
Article number095407
Pages (from-to)1-7
Number of pages7
JournalJournal of Physics D: Applied Physics
Volume42
Issue number9
DOIs
Publication statusPublished - 7 May 2009

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