Synthesis and photoluminescence properties of a cyan-emitting phosphor Ca3(PO4)2:Eu2+ for white light-emitting diodes |
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| Affiliation: | 1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), Key Laboratory of Sustainable Resources Processing and Advanced Materials (Education Department of Hunan Province), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, China;2. School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China;1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China;2. Institute of Materials Science and Technology, Chengdu University of Technology, Chengdu 610059, China;1. Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), Hunan Normal University, Changsha 410081, China;2. Key Laboratory of Sustainable Resources Processing and Advanced Materials of Hunan Province College, Hunan Normal University, Changsha 410081, China;3. School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China;1. MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, KLGHEI of Environment and Energy Chemistry, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China;2. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China;1. Faculty of Materials Science and Chemistry, Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan 430074, China;2. Department of Physics, Nan Chang University, Jiangxi, Nanchang 330031, China;3. School of Physics and Technology, Wuhan University, Wuhan 430072, China;1. College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan, 030024, PR China;2. Department of Physics, Sri Vidya Mandir Arts and Science College, Katteri, Uthangarai, Krishnagiri 636902, Tamil Nadu, India |
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| Abstract: | In this paper, a cyan-emitting phosphor Ca3(PO4)2:Eu2+ (TCP:Eu2+) was synthesized and evaluated as a candidate for white light emitting diodes (WLEDs). This phosphor shows strong and broad absorption in 250–450 nm region, but the emission spectrum is prominent at around 480 nm. The emission intensity of the TCP:Eu2+ was found to be 60% and 82% of that of the commercial BaMgAl10O17:Eu2+ (BAM) under excitation at 340 nm and 370 nm, respectively. Upon excitation at 370 nm, the absolute internal and external quantum efficiencies of the Ca3(PO4)2:1.5%Eu2+ are 60% and 42%, respectively. Moreover, a white LED lamp was fabricated by coating TCP:Eu2+ with a blue-emitting BAM and a red-emitting CaAlSiN3:Eu2+ on a near-ultraviolet (375 nm) LED chip, driven by a 350 mA forward bias current, and it produces an intense white light with a color rendering index of 75. |
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| Keywords: | Cyan-emitting White LED Calcium triphosphate Phosphor |
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