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Improvement of electroluminescent property of blue LED coated with highly luminescent yellow-emitting phosphors

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Abstract

White light-emitting diodes (WLEDs) were fabricated by combining InGaN-based blue light-emitting diodes (LEDs) with highly luminescent Tb3Al5O12:Ce3+ (TAG:Ce), Y3Al5O12:Ce3+ (YAG:Ce), and Sr3SiO5:Eu2+ (SS:Eu). The TAG:Ce-based WLED showed a color rendering index (R a ) of 79 and a luminous efficiency (η L ) of 34.1 lm/W at 20 mA. The YAG:Ce-based WLED and the SS:Eu-based WLED showed low R a values of 75 and 57 but high luminous efficiency values of 38.9 and 41.3 lm/W at 20 mA, respectively. When a mixture of YAG:Ce and SS:Eu was coated on a blue LED and the resultant WLED operated at 20 mA, the WLED showed a highly bright white light similar to daylight (η L =40.9 lm/W, color temperature T c =5,716 K, and R a =76). Moreover, the WLED showed stable color coordinates against a considerable variation of applied current.

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Author notes

  1. H. S. Jang

    Present address: Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA

  2. Y.-H. Won

    Present address: School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA

Authors and Affiliations

  1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea

    H. S. Jang, Y.-H. Won & D. Y. Jeon

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  1. H. S. Jang
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  2. Y.-H. Won
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  3. D. Y. Jeon
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Correspondence to D. Y. Jeon.

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Jang, H.S., Won, YH. & Jeon, D.Y. Improvement of electroluminescent property of blue LED coated with highly luminescent yellow-emitting phosphors. Appl. Phys. B 95, 715–720 (2009). https://doi.org/10.1007/s00340-009-3484-1

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  • DOI: https://doi.org/10.1007/s00340-009-3484-1

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