Li 2 SrSiO 4 :Eu 2+ phosphor prepared by the Pechini method and its application in white light emitting diode
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nli Fua) College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China
Hai Wang Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People’s Republic of China
Xiufeng Song, Zhengwei Pan, and Xinran Zhao College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, People’s Republic of China
Xueliang Zhang Eco-Materials and Renewable Energy Research Center (ERERC), Department of Physics & National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, People’s Republic of China
Yongge Cao Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, People’s Republic of China (Received 19 February 2008; accepted 1 August 2008)
Eu2+-doped Li2SrSiO4 phosphors were prepared by two different synthesis processes, the Pechini sol-gel route and solid-state reaction (SSR) method. Their morphology, crystal structure, and luminescence properties have been characterized. Li2SrSiO4:Eu2+ phosphors show broad and intensive excitation in the range of 390–480 nm and emit yellow-orange light extending from 500 to 700 nm. The luminescence efficiency of Li2SrSiO4: Eu2+ phosphors synthesized through the Pechini route is much better than that of phosphors prepared by solid-state reaction method. The application of phosphors from the Pechini route in white light emitting diodes (LEDs) has been investigated. The Commission Internationale de L’Eclairage (CIE) chromaticity coordinates and the correlated color temperature of these white LEDs have been calculated; they are comparable to corresponding values of commercial Y3Al5O12:Ce3+ converted white LEDs. I. INTRODUCTION
Phosphors with a yellow light emission for phosphor converted white light emitting diodes (LEDs) have attracted considerable interest recently.1–7 Compared to conventional incandescent and fluorescent lamps, these white LEDs have several advantages such as higher power efficiency, longer lifetime, non-pollution, and design flexibility.2,3 White LED products using the yellow phosphor Y3Al5O12:Ce3+ (YAG:Ce3+) covered blue LED are now available on the commercial market. To develop efficient white LEDs with high lumen efficiency at low cost, the Eu2+ doped phosphors have been investigated, a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2008.0394 3288
http://journals.cambridge.org
J. Mater. Res., Vol. 23, No. 12, Dec 2008 Downloaded: 11 Mar 2015
such as (Sr1−xBax)2SiO4,4 Sr3SiO5,5 Ca-␣-sialon,6,7 Sr2SiO4,8 and Li2SrSiO4,9–11 etc. Eu2+-doped Li2SrSiO4 was recently reported to be a promising phosphor candidate for white LEDs.9 However, the studies about its successful synthesis and rare earth ion doping are few.9–12 The luminescence properties of phosphors are stro
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