期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 519, 期 -, 页码 149-155出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.12.158
关键词
Y3Al5O12:Ce3+; Si3N4; Phosphor; Color rendering index; White light-emitting diodes
资金
- National Natural Science Foundation of China [50902050]
- Fundamental Research Funds for the Central Universities [78210002]
- Special Project for Nanotechnology of Shanghai [11nm0501200]
This paper reports a low-cost yellow-orange emitting Y3Al5-xSixO12-xNx:Ce3+ phosphor with excellent color rendering for warm white LEDs. It was synthesized by a simple gas pressure sintering (GPS). The effect of Si4+-N3- incorporation on the optical properties of Y3Al5O12:Ce3+ phosphor was investigated. The addition of Si3N4 leads to an obvious shift of its emission spectra toward the red region and an increase of FWHM accompanying a significant decrease of photoluminescent intensity, which is assigned to incorporation of N3- in Ce3+ nearest neighbor coordination. Adding nanosized amorphous Si3N4 or flux can greatly improve the emission intensity of Y2.925Ce0.075Al5-xSixO12-xNx phosphor. Finally, the white LED flat lamp with a CRI as high as 83, luminous efficiency of 65 lm/W, and CCT of about 3700 K is successfully realized by using a single oxynitride phosphor combined with a blue LED chip, which is acceptable for general indoor illuminations to replace fluorescent or incandescent lamps. (c) 2012 Elsevier B.V. All rights reserved.
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