Near UV-pumped yellow-emitting Sr 8 MgSc(PO 4 ) 7 :Eu 2+ phosphor for white-light LEDs with excellent color rendering index

Chien Hao Huang, Yen Chi Chen, Teng-Ming Chen*, Ting Shan Chan, Hwo Shuenn Sheu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

An Eu 2+ -activated Sr 8 MgSc(PO 4 ) 7 :Eu 2+ yellow-emitting phosphor with strong luminescence was synthesized and its crystal structure has been refined and determined from the XRD profiles using synchrotron light source by Rietveld refinement method. Non-radiative transitions between Eu 2+ ions in the Sr 8 MgSc(PO 4 ) 7 host have also been demonstrated to be attributable to dipole-dipole interactions, and the critical distance was estimated to be 24.83 Å by using spectral overlap methods. In addition, white-light near-UV LEDs were fabricated by using a phosphor blend of composition-optimized yellow-emitting Sr 8 MgSc(PO 4 ) 7 :0.01Eu 2+ and blue-emitting BaMgAl 10 O 17 :Eu 2+ commodity pumped with a 400 nm near-UV chip and the Ra value and reduced color temperature of were found to be 96.7 and 5,614 K, respectively. These results indicate that yellow-emitting Sr 8 MgSc(PO 4 ) 7 :xEu 2+ can serve as a promising candidate for application in white-light LEDs.

Original languageEnglish
Pages (from-to)5645-5649
Number of pages5
JournalJournal of Materials Chemistry
Volume21
Issue number15
DOIs
StatePublished - 21 Apr 2011

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