NDLI: Thermal stability of luminous YAG: Ce bulk ceramic as a remote phosphor prepared through silica-stabilizing valence of activator in air

Content Provider	SpringerLink
Author	Wang, Peng Song, Jun Tian, Hua Lu, Qi fei Wang, Da jian
Copyright Year	2012
Abstract	A prototype of YAG: Ce (Y$_{3}$Al$_{5}$O$_{12}$) luminous bulk ceramic as a remote phosphor for white LED illumination was fabricated in air through a strategy of silica addition. With increasing the amount of silica in a specific range, the opaque sample turns to be semi-transparent. The precipitation of crystals is verified to be in pure YAG phase by X-ray diffraction (XRD). Beyond the limit of silica amount, the dominant phase of YAG crystal is found to coexist with a small amount of newly-formed Y$_{2}$Si$_{2}$O$_{7}$, Al$_{2}$O$_{3}$ and the amorphous phase. The YAG crystals are with a grain size of approximately 2 μm and distribute evenly. The YAG hosts after structural modification via addition of silica result in yellow band emission of 5d → 4f transition peaked around 535 nm as excited by a blue LED, owing to the self-reduction of Ce$^{4+}$ to Ce$^{3+}$ even in the absence of reductive atmosphere.
Starting Page	201
Ending Page	204
Page Count	4
File Format	PDF
ISSN	16731905
Journal	Optoelectronics Letters
Volume Number	8
Issue Number	3
e-ISSN	19935013
Language	English
Publisher	Tianjin University of Technology
Publisher Date	2012-05-08
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Electronic, Optical and Magnetic Materials Condensed Matter Physics Atomic and Molecular Physics, and Optics

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