(Ba,Sr)Y2Si2Al2O2N 5:Eu2+: A novel near-ultraviolet converting green phosphor for white light-emitting diodes

Wei Ren Liu, Chiao Wen Yeh, Chien Hao Huang, Chun Che Lin, Yi Chen Chiu, Yao Tsung Yeh, Ru Shi Liu

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Abstract

A highly intense green-emitting phosphor BaY2Si 2Al2O2N5:Eu2+ (BYN:Eu2+) peaking at 511 nm was synthesized by a solid state reaction. The structure refinement, luminescence properties of BYN:Eu 2+ phosphors as well as their thermal quenching and the fabrication of white-light-emitting diodes (W-LEDs) were firstly investigated. By partially substituting Ba by Sr, namely (Ba,Sr)Y2Si2Al 2O2N5:Eu2+ (BSYN:Eu2+), the emission peak was shifted to 565 nm, giving a yellow-orange color, due to the splitting of the 5d energy level. By utilizing a mixture of blue-emitting BaMgAl10O17:Eu2+, green-emitting BYN:Eu 2+ and red-emitting CaAlSiN3:Eu2+ phosphors as light converters, an intense white GaN-based n-UV-LED (380 nm) was fabricated to a exhibit good color-rendering index Ra of 84.5 at a correlated color temperature of 5089 K and CIE coordinates of (0.3425, 0.3478). Based on these results, we are currently evaluating the potential application of BYN:Eu2+ as a green-emitting near-UV convertible phosphor.

Original languageEnglish
Pages (from-to)3740-3744
Number of pages5
JournalJournal of Materials Chemistry
Volume21
Issue number11
DOIs
Publication statusPublished - Mar 21 2011
Externally publishedYes

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ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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