High efficiency and high color purity blue-emitting NaSrBO 3:Ce3+ phosphor for near-UV light-emitting diodes

Wei Ren Liu*, Chien Hao Huang, Chih Pin Wu, Yi Chen Chiu, Yao Tsung Yeh, Teng-Ming Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

259 Scopus citations

Abstract

A highly intense blue-emitting phosphor NaSrBO3:Ce3+, peaking at 400 nm was synthesized by a solid state reaction. The crystal structure, luminescence properties and quantum efficiency of NaSrBO 3:Ce3+ phosphors, as well as their thermal quenching capabilities and the fabrication of a 370 nm UV-chip and R/G/B phosphors were investigated for the first time. The composition-optimized NaSrBO 3:1%Ce3+ exhibited high external quantum efficiency of 89% of the blue-emitting, commercial compound, BaMgAl10O 17:Eu2+ (BAM:Eu2+). The color purity of as-synthesized NaSrBO3:1%Ce3+ phosphor is much better than that of BAM:Eu2+. By using a GaN-based UV-LED (370 nm) and a mixture of blue-emitting NaSrBO3:Ce3+, green-emitting (Ba,Sr)2SiO4:Eu2+ and red-emitting CaAlSiN 3:Eu2+ phosphors as light converters, we constructed an intense white light emitting diode. The LED device exhibited an excellent color-rendering index Ra of 93.13 at a correlated color temperature of 5763 K with CIE coordinates of (0.324,0.337) and a maximum lumen efficacy of 26.2 lm W-1. Based on the results, we are currently evaluating the potential application of NaSrBO3:Ce3+ as a blue-emitting UV convertible phosphor.

Original languageEnglish
Pages (from-to)6869-6874
Number of pages6
JournalJournal of Materials Chemistry
Volume21
Issue number19
DOIs
StatePublished - 21 May 2011

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