An Efficient, Thermally Stable Cerium-Based Silicate Phosphor for Solid State White Lighting

A novel cerium-substituted, barium yttrium silicate has been identified as an efficient blue-green phosphor for application in solid state lighting. Ba9Y2Si6O24:Ce3+ was prepared and structurally characterized using synchrotron X-ray powder diffraction. The photoluminescent characterization identifi...

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Published in:Inorganic chemistry 2013-07, Vol.52 (14), p.8010-8016
Main Authors: Brgoch, Jakoah, Borg, Christopher K. H, Denault, Kristin A, Mikhailovsky, Alexander, DenBaars, Steven P, Seshadri, Ram
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cited_by cdi_FETCH-LOGICAL-a408t-27fa88605c93b2dd8143c85016cd44d6b4e4683cc3cef81723ce9b17e642fde93
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container_end_page 8016
container_issue 14
container_start_page 8010
container_title Inorganic chemistry
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creator Brgoch, Jakoah
Borg, Christopher K. H
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Seshadri, Ram
description A novel cerium-substituted, barium yttrium silicate has been identified as an efficient blue-green phosphor for application in solid state lighting. Ba9Y2Si6O24:Ce3+ was prepared and structurally characterized using synchrotron X-ray powder diffraction. The photoluminescent characterization identified a major peak at 394 nm in the excitation spectrum, making this material viable for near-UV LED excitation. An efficient emission, with a quantum yield of ≈60%, covers a broad portion (430–675 nm) of the visible spectrum, leading to the blue-green color. Concentration quenching occurs when the Ce3+ content exceeds ≈3 mol %, whereas high temperature photoluminescent measurements show a 25% drop from the room temperature efficiency at 500 K. The emission of this compound can be red-shifted via the solid solution Ba9(Y1–y Sc y )1.94Ce0.06Si6O24 (y = 0.1, 0.2), allowing for tunable color properties when device integration is considered.
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title An Efficient, Thermally Stable Cerium-Based Silicate Phosphor for Solid State White Lighting
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