NDLI: K2Ln(PO4)(WO4):Tb3+,Eu3+ (Ln = Y, Gd and Lu) phosphors: highly efficient pure red and tuneable emission for white light-emitting diodes

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K₂Ln(PO₄)(WO₄):Tb³⁺,Eu³⁺ (Ln = Y, Gd and Lu) phosphors: highly efficient pure red and tuneable emission for white light-emitting diodes

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Journal of Materials Chemistry C Vol - 3 Issue - 8

Journal of Materials Chemistry C Vol - 3 Issue - 7

Journal of Materials Chemistry C Vol - 3 Issue - 6

Journal of Materials Chemistry C Vol - 3 Issue - 5

Journal of Materials Chemistry C Vol -2

Journal of Materials Chemistry C Vol -1

K₂Ln(PO₄)(WO₄):Tb³⁺,Eu³⁺ (Ln = Y, Gd and Lu) phosphors: highly efficient pure red and tuneable emission for white light-emitting diodes

Content Provider	Royal Society of Chemistry (RSC)
Author	Feng, Jiajun Li, Junhao Su, Qiang Wen, Dawei Shi, Jianxin Wu, Mingmei
Copyright Year	2015
Abstract	A novel phosphate/tungstate family, K2Ln(PO4)(WO4) (Ln = Y, Gd and Lu) doped with Tb3+ and Eu3+ is synthesized via a conventional high-temperature solid-state reaction to explore new pure red phosphors with high critical concentration for white light-emitting diodes (WLEDs). The results from the Rietveld method show that the crystal structures of the hosts are composed of phosphate layers and tungstate zigzags, and the Ln3+–Ln3+-units are isolated by the [PO4]3− groups in phosphate layers. The critical concentration of Tb3+ and Eu3+ is up to 40–50% in the singly doped phosphors, which is ascribed to the interaction of the isolated Ln3+ ions being mitigated by [PO4]3− and [WO4]2− groups, such that the special structure of K2Ln(PO4)(WO4) helps the interaction of luminescence centres. The energy transfer from Tb3+ to Eu3+ in K2Ln(PO4)(WO4) is demonstrated by fluorescence decay times. By adjusting the ratio of Eu3+ and Tb3+, we can tune the emission colour of K2Ln(PO4)(WO4):Tb3+,Eu3+ from green to yellow, orange and pure red. For K2Tb0.5Eu0.5(PO4)(WO4), the internal quantum efficiency is as high as 76.45% under an excitation of 394 nm, and the emission intensity at 150 °C is 92.2% of that at 25 °C.
Starting Page	2107
Ending Page	2114
Page Count	8
File Format	HTM / HTML PDF
ISSN	20507526
Volume Number	3
Issue Number	9
Journal	Journal of Materials Chemistry C
DOI	10.1039/c4tc02406k
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Lu Rietveld Phosphate Tungstate Rietveld refinement Luminescence Fluorescence Quantum Emission intensity
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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