Orange emissive Sr3Al2O5Cl2:Eu2+ phosphor for warm-white light-emitting diodes |
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| Authors: | Xinmin Zhang Namsik Choi Kwangwon Park Jongsu Kim |
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| Affiliation: | 1. Department of Image System Science and Engineering, Pukyong National University, Busan 608-739, Republic of Korea;2. School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;1. Department of Materials Science, School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China;2. Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China;1. Key Laboratory of Strongly-Coupled Quantum Matter Physics, Chinese Academy of Sciences, School of Physical Sciences, University of Science and Technology of China, No. 96 Jinzhai Road, Hefei, Anhui Province 230026, China;2. Physics Experiment Teaching Center, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China;3. New Energy Technology Engineering Laboratory of Jiangsu Province & School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China;4. National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China;1. Postdoctoral Program, Yuexiu Group Co., Ltd., Guangzhou 510623, China;2. Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, Guangzhou 510515, China;3. Department of Hygiene Detection Center, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health, Southern Medical University, Guangzhou 510515, China |
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| Abstract: | Orange-emitting Sr3Al2O5Cl2:Eu2+ phosphors were synthesized by a high-temperature solid-state reaction. The excitation spectrum shows a broad band from the UV region to the blue region. The emission spectrum shows strong orange emission peaking at 610 nm, attributed to the d–f transition of the Eu2+ ion. By combining the Sr3Al2O5Cl2:Eu2+ phosphor with 420 nm and 460 nm chips, three white light-emitting diodes (LEDs) were fabricated. The warm-white LEDs show color rendering indexes of 76, 66 and 90 with color temperatures of 2447, 3546 and 4300 K, respectively. This new phosphor exhibits the potential to act as a single host doped with Eu2+ phosphor for UV or blue chip excited white LEDs. |
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