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

Won Bin Im; Natalie N. Fellows; Steven P. DenBaars; Ram Seshadri

doi:10.1039/B818313A

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Journal of Materials Chemistry

Issue 9, 2009

Journal of Materials Chemistry was published between 1991 and 2012. From issue 1, 2013, it was replaced by three new journals: Journal of Materials Chemistry A, B and C

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La_{1−x−0.025}Ce_0.025Sr_2+xAl_1−xSi_xO₅ solid solutions as tunable yellow phosphors for solid state white lighting

Won Bin Im,^a Natalie N. Fellows,^a Steven P. DenBaars^a and Ram Seshadri*^a

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Solid State Lighting and Energy Center, Materials Department, and Materials Research Laboratory, University of California, Santa Barbara, USA
E-mail: seshadri@mrl.ucsb.edu ;
Fax: +1-805-893-8797 ;
Tel: +1-805-893-6129

J. Mater. Chem., 2009,19, 1325-1330

DOI: 10.1039/B818313A
Received 17 Oct 2008, Accepted 05 Dec 2008
First published online 26 Jan 2009

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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 (λ_max = 430 nm), we obtain white light with a color rendering index (R_a) 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.

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La_{1−x−0.025}Ce_0.025Sr_2+xAl_1−xSi_xO₅ solid solutions as tunable yellow phosphors for solid state white lighting

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Journal of Materials Chemistry

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

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La_{1−x−0.025}Ce_0.025Sr_2+xAl_1−xSi_xO₅ solid solutions as tunable yellow phosphors for solid state white lighting