Synthesis and Luminescence Properties of Novel Ce 3+ - and Eu 2+ -Doped Lanthanum Bromothiosilicate La 3 Br(SiS 4 ) 2 Phosphors for White LEDs

Szu Ping Lee, Shuang De Liu, Ting Shan Chan, Teng-Ming Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

Novel Ce 3+ - and Eu 2+ -doped lanthanum bromothiosilicate La 3 Br(SiS 4 ) 2 :Ce 3+ and La 3 Br(SiS 4 ) 2 :Eu 2+ phosphors were prepared by solid-state reaction in an evacuated and sealed quartz glass ampule. The La 3 Br(SiS 4 ) 2 :Ce 3+ phosphor generates a cyan emission upon excitation at 375 nm, whereas the La 3 Br(SiS 4 ) 2 :Eu 2+ phosphor could be excited with extremely broad range from UV to blue region (300 to 600 nm) and generates a reddish-orange broadband emission centered at 640 nm. In addition, thermal luminescence properties of La 3 Br(SiS 4 ) 2 :Ce 3+ and La 3 Br(SiS 4 ) 2 :Eu 2+ phosphors from 20 to 200°C were investigated. The combination of a 450 nm blue InGaN-based LED chip with the red-emitting La 3 Br(SiS 4 ) 2 :Eu 2+ phosphor, and green-emitting BOSE:Eu 2+ commercial phosphor produced a warm-white light with the CRI value of ∼95 and the CCT of 5,120 K. Overall, these results show that the prepared phosphors may have potential applications in pc-WLED.

Original languageEnglish
Pages (from-to)9218-9223
Number of pages6
JournalACS Applied Materials and Interfaces
Volume8
Issue number14
DOIs
StatePublished - 27 Apr 2016

Keywords

  • light emitting diodes
  • luminescence
  • rare-earth activator
  • solid-state lighting
  • thiosilicate phosphor

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