A novel tunable green- to yellow-emitting β-YFS:Ce 3+ phosphor for solid-state lighting

Yun Chen Wu, De Yin Wang, Teng-Ming Chen*, Chi-Shen Lee, Kuo Ju Chen, Hao-Chung Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

96 Scopus citations

Abstract

A Ce 3+ -activated fluorosulfide phosphor (β-YFS:Ce 3+ ) was synthesized by solid-state reaction in a sealed tube. The crystal structure has been refined from the XRD profiles and there are two different crystallographic rare earth sites, namely, Y(1) and Y(2), where the Ce 3+ ions occupied. The emission band with a maximum at 495 nm of β-Y 0.99 Ce 0.01 FS phosphor was characterized by the 4f-5d transitions of Ce 3+ ion. With increasing Ce 3+ concentration, the emission variations were observed from 495 to 547 nm. When β-YFS:Ce 3+ phosphors were utilized to incorporate with n-UV/blue chip, greenish-white light with color rendering index of 65-77 were obtained. The results indicate that the tunable green- to yellow-emitting β-YFS:Ce 3+ can serve as a potential phosphor for incorporation in fabrication for solid-state lighting. The preparation, spectroscopic characterization, quantum efficiency, thermal-quenching behavior, and related LED device data are also presented.

Original languageEnglish
Pages (from-to)3195-3199
Number of pages5
JournalACS Applied Materials and Interfaces
Volume3
Issue number8
DOIs
StatePublished - 24 Aug 2011

Keywords

  • β-YFS
  • Ce
  • emission-tunable
  • fluorosulfide
  • LED
  • phosphor

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