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Issue 30, 2014
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Synthesis, structure and optical properties of europium doped calcium barium phosphate – a novel phosphor for solid-state lighting

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Abstract

A new phase, Ca6BaP4O17, was found in the CaO–BaO–P2O5 phase diagram and its Eu2+-doped derivative was evaluated as a possible phosphor for solid-state lighting. Ca6BaP4O17 was prepared by conventional solid-state synthesis and its structure was solved ab initio from high-resolution, synchrotron X-ray powder diffraction data. The bandgap of Ca6BaP4O17 was estimated to be 5.79 eV. Under excitation with UV to blue light, Ca6BaP4O17:Eu2+ shows strong yellow emission with the peak position at 553 nm. A white LED, which was fabricated with an InGaN blue chip and Ca6BaP4O17:Eu2+, achieved a luminous efficacy of 31 lm W−1 with a color-rendering index of 78 around the correlated color temperature of 6500 K.

Graphical abstract: Synthesis, structure and optical properties of europium doped calcium barium phosphate – a novel phosphor for solid-state lighting

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Supplementary files

Article information


Submitted
11 Apr 2014
Accepted
25 May 2014
First published
27 Jun 2014

J. Mater. Chem. C, 2014,2, 6084-6089
Article type
Paper

Synthesis, structure and optical properties of europium doped calcium barium phosphate – a novel phosphor for solid-state lighting

N. Komuro, M. Mikami, Y. Shimomura, E. G. Bithell and A. K. Cheetham, J. Mater. Chem. C, 2014, 2, 6084
DOI: 10.1039/C4TC00732H

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