Novel green-emitting Na2CaPO4F:Eu2 phosphors for near-ultraviolet white light-emitting diodes

Chien Hao Huang, Yen Chi Chen, Te Wen Kuo, Teng-Ming Chen*

*Corresponding author for this work

Research output: Contribution to journalArticle

20 Scopus citations


In this study, green-emitting Na2CaPO4F:Eu 2 phosphors were synthesized by solid-state reactions. The excitation spectra of the phosphors showed a broad hump between 250 and 450 nm; the spectra match well with the near-ultraviolet (NUV) emission spectra of light-emitting diodes (LEDs). The emission spectrum showed an intense broad emission band centered at 506 nm. White LEDs were fabricated by integrating a 390 nm NUV chip comprising blue-emitting BaMgAl10O 17:Eu2, green-emitting Na2CaPO 4F:0.02 Eu2, and red-emitting CaAlSiN3:Eu 2 phosphors into a single package; the white LEDs exhibited white light with a correlated color temperature of 5540 K, a color-rendering index of 90.75, and color coordinates (0.332, 0.365) close to those of ideal white light.

Original languageEnglish
Pages (from-to)1346-1349
Number of pages4
JournalJournal of Luminescence
Issue number7
StatePublished - 1 Jul 2011


  • Light-emitting diodes
  • NaCaPOF:Eu
  • Phosphors

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