Synthesis and photoluminescence properties of red-emitting Y6WO12:Eu3+ phosphors

Tzu Chin Chien, Ji Chun Yang, Chii Shyang Hwang, Masahiro Yoshimura

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22 Citations (Scopus)

Abstract

For a system of white-light-emitting diodes (WLEDs) fabricated using near-ultraviolet (UV) LED chips coated with RGB tri-color phosphors, the most important issue is enhancing the efficiency of the red phosphor. Y6WO12:Eu3+ phosphor is a potential material that can emit red color under near-UV excitation. This work investigated the luminescence properties of Y6WO12:Eu3+ under UV light excitation. The photoluminescence (PL) emission intensity of EuxY6-xWO12 (x = 0.1-1.0) phosphor from the 5D07F2 transition increased with Eu3+ content until x = 0.9. For x > 0.9, the PL emission intensity decreased due to concentration quenching. The decay time of EuxY6-xWO12 (x = 0.1-1.0) phosphor for the 5D07F2 transition was about 0.6-0.7 ms and did not decrease obviously, which means that there was no nonradiative energy transfer in the phosphor. The asymmetry ratio (5D07F2/5D07F1) of EuxY6-xWO12 (x = 0.1-1.0) was about 2, which caused the PL emission intensity of EuxY6-xWO12 (x = 0.1-1.0) phosphor from the 5D07F2 transition to be higher than that from the 5D07F1 transition. The chromaticity coordinates of the EuxY6-xWO12 (x = 0.1-1.0) phosphor were close to the chromaticity coordinates of the standard red color. The EuxY6-xWO12 (x = 0.9) phosphor showed the highest quantum efficiency.

Original languageEnglish
Pages (from-to)286-291
Number of pages6
JournalJournal of Alloys and Compounds
Volume676
DOIs
Publication statusPublished - 2016 Aug 15

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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