Novel emission-tunable oxyapatites-type phosphors: Synthesis, luminescent properties and the applications in white light emitting diodes with higher color rendering index. (April 2017)

• Record Type: Journal Article
• Authors: Guo, Qingfeng; Zhao, Chenglong; Jiang, Zhouqing; Liao, Libing; Liu, Haikun; Yang, Dan; Mei, Lefu
• Is Part Of: Dyes and pigments. Volume 139(2017)
• Page Start: 361
• Page End: 371
• Publication Date: 2017-04
• Subjects: Ba10(PO4)6O: Eu2+, Tb3+/Li+ -- Phosphors -- Energy transfer -- White-light-emitting diodes; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.12.042
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Developing color-tunable phosphors via the introduction of co-doping activators and sensitizers to the host with energy transfer processes has been a state-of-the-art topic for a long time. In this work, novel emission-tunable oxyapatites-type Ba10 (PO4 )6 O:Eu 2+, Tb 3+ /Li + phosphors were prepared via a high temperature solid state reaction for the applications in white light emitting diodes ( w -LEDs) with higher color rendering index. Tunable colors from blue to green can be realized in the Ba10 (PO4 )6 O:Eu 2+, Tb 3+ /Li + by varying the relative ratios of Eu 2+ to Tb 3+, showing good absorption in the range of 230–400 nm. The energy transfer mechanism from Eu 2+ to Tb 3+ ions was demonstrated to be a quadrupole-quadrupole interaction by combining the Inokuti-Hirayama (IH) model and Reisfeld's approximation. Importantly, a prototype white lamp was packaged by mixing Ba9.83 (PO4 )6 O: 0.03Eu 2+, 0.07Tb 3+, 0.07Li + and commercial red phosphor CaAlSiN3 : Eu 2+, and the lamp exhibits a higher color rendering index (Ra = 92 and R9 = 56) and warm correlated color temperature of 4361 K for the actual application. Better luminescent properties compared to commercial Y3 Al5 O12 :Ce 3+ -based w -LEDs, indicating that Ba10 (PO4 )6 O: Eu 2+, Tb 3+ /Li + phosphors are emerging as potential phosphor-converted w -LEDs. Highlights: Broad-band excited Ba10 (PO4 )6 O:Eu 2+, Tb 3+ /Li + phosphors were prepared. Efficient energy transfer from Eu 2+ to Tb 3+ in Ba10 (PO4 )6 O were investigated. Ba10 (PO4 )6 O:Eu 2+, Tb 3+ /Li + have potential applications as blue-green emitting phosphors in w-LEDs.