Ca 2 PO 4 Cl:Eu 2+: An intense near-ultraviolet converting blue phosphor for white light-emitting diodes

Yi Chen Chiu, Wei Ren Liu*, Chun Kuei Chang, Cheng Chun Liao, Yao Tsung Yeh, Shyue Ming Jang, Teng-Ming Chen

*Corresponding author for this work

Research output: Contribution to journalArticle

145 Scopus citations

Abstract

A blue phosphor Ca 2 PO 4 Cl:Eu 2+ was synthesized by solid state reaction and evaluated as a candidate for white LEDs. The luminescent intensity of Ca 2 PO 4 Cl:Eu 2+ was found to be 128% under excitation at 380 nm, 149% under 400 nm, and 247% under 420 nm, as high as that of BaMgAl 10 O 17 :Eu 2+ . Furthermore, Ca 2 PO 4 Cl:Eu 2+ reveals high quantum efficiency and excellent thermal stability. By utilizing a mixture of blue-emitting Ca 2 PO 4 Cl:Eu 2+ , green-emitting (Ba,Sr) 2 SiO 4 :Eu 2+ and red-emitting CaAlSiN 3 :Eu 2+ as light converters, an intense white GaN-based n-UV-LED (400 nm) was fabricated to exhibit an excellent color-rendering index R a of 93.4 at a correlated color temperature of 4590 K. Based on the results, we are currently evaluating the potential application of Ca 2 PO 4 Cl:Eu 2+ as a blue-emitting near-UV convertible phosphor.

Original languageEnglish
Pages (from-to)1755-1758
Number of pages4
JournalJournal of Materials Chemistry
Volume20
Issue number9
DOIs
StatePublished - 24 Feb 2010

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    Chiu, Y. C., Liu, W. R., Chang, C. K., Liao, C. C., Yeh, Y. T., Jang, S. M., & Chen, T-M. (2010). Ca 2 PO 4 Cl:Eu 2+: An intense near-ultraviolet converting blue phosphor for white light-emitting diodes. Journal of Materials Chemistry, 20(9), 1755-1758. https://doi.org/10.1039/b920610h