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Issue 9, 2009
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La1−x−0.025Ce0.025Sr2+xAl1−xSixO5 solid solutions as tunable yellow phosphors for solid state white lighting

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Abstract

Solid solutions of two isotypic compounds from the end members LaSr2AlO5 and Sr3SiO5 are hosts for Ce3+ activator ions, allowing for careful tuning of the various parameters associated with efficient solid state (blue + yellow =) white lighting. By incorporating this phosphor with an encapsulant on InGaN light-emitting diodes (λmax = 430 nm), we obtain white light with a color rendering index (Ra) between 67 and 70 and color temperatures between 6550 and 7345 K, with relatively high efficacies, suggesting these solid solutions are promising for applications in solid state white lighting.

Graphical abstract: La1−x−0.025Ce0.025Sr2+xAl1−xSixO5 solid solutions as tunable yellow phosphors for solid state white lighting

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Article information


Submitted
17 Oct 2008
Accepted
05 Dec 2008
First published
26 Jan 2009

J. Mater. Chem., 2009,19, 1325-1330
Article type
Paper

La1−x−0.025Ce0.025Sr2+xAl1−xSixO5 solid solutions as tunable yellow phosphors for solid state white lighting

W. B. Im, N. N. Fellows, S. P. DenBaars and R. Seshadri, J. Mater. Chem., 2009, 19, 1325
DOI: 10.1039/B818313A

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