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Issue 35, 2016
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CaAlSiN3:Eu2+ translucent ceramic: a promising robust and efficient red color converter for solid state laser displays and lighting

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Abstract

As an excellent red phosphor, CaAlSiN3:Eu2+ plays a major role in high color rendition or wide color gamut white light-emitting diodes, but it can hardly be used in high-power laser displays and lighting due to the intrinsic low thermal performance of the phosphor/silicone resin mixture. To apply CaAlSiN3:Eu2+ in laser lighting devices, a bulk ceramic form is thus required to survive thermal attack and high flux density irradiation. However, it remains an unsolved great challenge to fabricate fully densified CaAlSiN3:Eu2+ ceramics. Here, for the first time, translucent CaAlSiN3:Eu2+ ceramics with an interesting composite microstructure, where red-emitting phosphor particles with a core–shell structure are uniformly embedded in a non-luminescent α-Sialon matrix, are successfully synthesized using Si3N4 and SiO2 as sintering additives. The luminescence ceramic is superior to the corresponding powder phosphor in terms of its enhanced thermal stability (15% increase) and thermal conductivity (4 W m−1 K−1). It has a high external quantum efficiency of 60% (87% that of the powder) upon 450 nm excitation, and a luminous efficacy of 10.6 lm W−1 when irradiated under a blue laser flux density of 0.75 W mm−2. The translucent CaAlSiN3:Eu2+ ceramic is thus supposed to be a potential color converter used in emerging laser lighting and display technologies.

Graphical abstract: CaAlSiN3:Eu2+ translucent ceramic: a promising robust and efficient red color converter for solid state laser displays and lighting

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Publication details

The article was received on 18 Jun 2016, accepted on 08 Aug 2016 and first published on 09 Aug 2016


Article type: Paper
DOI: 10.1039/C6TC02518H
Citation: J. Mater. Chem. C, 2016,4, 8197-8205
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    CaAlSiN3:Eu2+ translucent ceramic: a promising robust and efficient red color converter for solid state laser displays and lighting

    S. Li, Q. Zhu, L. Wang, D. Tang, Y. Cho, X. Liu, N. Hirosaki, T. Nishimura, T. Sekiguchi, Z. Huang and R. Xie, J. Mater. Chem. C, 2016, 4, 8197
    DOI: 10.1039/C6TC02518H

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