Double-Color Emitting SrSi2O2N2:Eu2+,Yb2+ Oxynitridosilicate Phosphor for Warm White-Light Emitting Diode with Highly Stable Color Chromaticity

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A green to orange emitting nitridosilicate based phosphor was developed for white-LED application. Observed broad-band emission in green to orange range is originated from Eu2+ and Yb2+-trap site of double doped SrSi2O2N2:Eu2+,Yb2+ nitridosilicate phosphor. Energy transfer between activator ions was confirmed by measuring of decay time of the green-emission as energy donor. The effect of co-doping by different ratio of activator ions on the photoluminescence properties was studied. Emission of the obtained phosphor is function of activator ion contents, and by increasing the Yb2+ concentration, the red emission dominants over green emission. The obtained phosphor was combined with InGaN blue-LED chip (lambda = 450 nm) to create white-light. The color balance control was realized by two steps. At first green to orange ratio was optimized by adjusting concentration of Eu2+ and Yb2+ ions. At second step, by increasing amount of phosphor powder the CIE coordinates were shifted from [0.2805; 0.2014] to [0.4071; 03789]. At optimized condition generated white light has color rendering index about 89. The LED based on the developed single-phase double-color emitting nitridosilicate phosphor and blue-LED chip showed high color stability against wide range of forward-bias current (100 to 500 mA at 3 V). (C) 2012 The Electrochemical Society. All rights reserved.
Publisher
ELECTROCHEMICAL SOC INC
Issue Date
2013
Language
English
Article Type
Article
Keywords

ENERGY-TRANSFER; LUMINESCENCE PROPERTIES; OXYNITRIDE; PHOTOLUMINESCENCE; NITRIDOSILICATES; LEDS

Citation

ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY, v.2, no.1, pp.R5 - R8

ISSN
2162-8769
DOI
10.1149/2.025301jss
URI
http://hdl.handle.net/10203/174929
Appears in Collection
MS-Journal Papers(저널논문)
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