Improvement of electroluminescent property of blue LED coated with highly luminescent yellow-emitting phosphors |
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| Authors: | H S Jang Y-H Won and D Y Jeon |
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| Institution: | (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;(2) Present address: Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA;(3) Present address: School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA |
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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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| Keywords: | PACS" target="_blank">PACS 76 30 Kg 78 55 -m 85 60 Jb |
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