Luminescence behavior of Li2Sr1‐3x/2EuxSiO4 red phosphors for LED applications |
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| Authors: | Xin‐Yuan Sun Liang‐Wu Lin Guang‐Yao Liu Xin‐Gen Liu Ai‐Jin Wu Shi‐Ming Huang |
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| Institution: | 1. Department of Physics, Jinggangshan University, Ji'an, People's Republic of China;2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan, People's Republic of China;3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, People's Republic of China;4. Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Department of Physics, Tongji University, Shanghai, People's Republic of China |
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| Abstract: | Red‐emitting Li2Sr1‐3x/2EuxSiO4 0≤x≤0.5) phosphors were synthesized at 900°C in air by a solid‐state reaction. The synthesized phosphors were characterized by X‐ray powder diffraction, photoluminescence (PL) excitation (PLE) and PL spectra. The results from the PLE spectra suggest that the strong 394 nm excitation peak associated with the 5L6 state of Eu3+ ions is of significance for near ultraviolet pumped white light‐emitting diodes and solid‐state lighting. It is also noted that the position of the charge transfer state of Eu3+ ions shifts towards the higher energy side (blue shift) by increasing the content of Eu3+ ions. The predominant emissions of Eu3+ ions under 394 nm excitation are observed at 580, 593, 614, 656 and 708 nm, which are attributed to the 5D0 → 7FJ (J = 0, 1, 2, 3 and 4), respectively. The PL results reveal that the optimal content of the red‐emitting Li2Sr1‐3x/2EuxSiO4 phosphors is x = 0.475. Simulation of the white light excited by 394 nm near ultraviolet light has also been carried out for its potential white light‐emitting diode applications. Copyright © 2013 John Wiley & Sons, Ltd. |
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| Keywords: | Photoluminescence Red‐emitting phosphors Solid‐state reaction White LEDs |
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