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Layered Ceramic Phosphors Based on CaAlSiN3:Eu and YAG:Ce for White Light-Emitting Diodes

Title data

Pricha, Irene ; Rossner, Wolfgang ; Moos, Ralf:
Layered Ceramic Phosphors Based on CaAlSiN3:Eu and YAG:Ce for White Light-Emitting Diodes.
In: Journal of the American Ceramic Society. Vol. 99 (January 2016) . - pp. 211-217.
ISSN 1551-2916
DOI: https://doi.org/10.1111/jace.13948

Official URL: Volltext

Abstract in another language

To develop warm-white light-emitting diodes via conversion phosphors, blue light-emitting diodes are generally combined with mixtures of green and red-emitting phosphor powders. Generally, the phosphors are provided by resin embedded particle dispersions. Such resin-based solutions cause several drawbacks with respect to LED lifetime and quality. Therefore, it has been investigated whether the red-emitting nitride phosphor CaAlSiN3:Eu and the green-emitting oxidic phosphor YAG:Ce can be cofired to layered ceramic composites. The shrinkage behavior and the composition of the interface in dependence of sintering temperature and the effect of interdiffusion processes at the interface on the luminescence properties were investigated. The formation of secondary phases at the interface in the cofired structures was found to limit the phosphor functionality for the nitride-based CaAlSiN3:Eu in such composite ceramics. To counteract this, sacrificial interlayers were introduced to produce multilayered ceramics comprising CaAlSiN3:Eu and YAG:Ce for LED lighting applications. It is shown for the first time, that it is possible to sinter layered CaAlSiN3:Eu and YAG:Ce composite ceramics in a pressureless process at moderate sintering temperatures if one uses thin-film passivated interfaces to reduce luminescence-disturbing diffusion phenomena. These results demonstrate that diffusion barriers can be suitable means to obtain layered ceramic composites comprising CaAlSiN3:Eu and YAG:Ce in a pressureless sintering process with good optical properties.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 18 Jan 2016 08:14
Last Modified: 18 Apr 2016 07:58
URI: https://eref.uni-bayreuth.de/id/eprint/29716