Luminescence properties of sol–gel derived Sr2(Ce1?xSnx)O4 blue phosphors |
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| Authors: | Chia-Hao Hsu Chia-Lien Liaw Chung-Hsin Lu |
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| Affiliation: | 1. State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China;2. Sun Yat-sen University, Guangzhou 510275, China;1. School of Information Science and Technology, Northwest University, Xi’an 710127, China;2. Department of Physics, Emory University, Atlanta, GA 30322, USA;1. Department of Mechanical Engineering, National Central University, Jhongli, Taoyuan, Taiwan 32001;2. Department of Materials Science and Engineering, National Dong Hwa University, Shoufeng, Hualien, Taiwan 97401;3. Department of Biomedical Engineering, National Yang Ming University, Taipei, Taiwan 11221 |
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| Abstract: | Monophasic Sr2(Ce1?xSnx)O4 phosphors (x = 0–0.07) were prepared via the sol–gel process. A broad excitation band ascribed to the Ce4+–O2? transition was observed in the range of 200–450 nm. With doping Sn4+ ions into the host, the intensity of the low-energy peak enhanced remarkably due to a decrease in crystal field. The intensity ratio of the low-energy peak to the high-energy peak increased with the amount of Sn4+ ions doped. Moreover, the red shift of the excitation peaks was observed due to an increase in the bond length of Ce–O. Upon excitation at around 346 nm, the intensity of the blue emission peak peaking at 483 nm was enhanced with doping Sn4+ ions. The doping of tin ions was found to significantly improve the luminescence characteristics of the prepared phosphors when they were excited under UV light. |
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