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

被引:309
作者
Jang, H. S. [1 ]
Won, Y. -H. [1 ]
Jeon, D. Y. [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Mat Sci & Engn, Taejon 305701, South Korea
来源
APPLIED PHYSICS B-LASERS AND OPTICS | 2009年 / 95卷 / 04期
关键词
WHITE-LIGHT EMISSION; QUANTUM DOTS; DIODES; SR3SIO5-CE3+;
D O I
10.1007/s00340-009-3484-1
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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 (eta (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 (eta (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.
引用
收藏
页码:715 / 720
页数:6
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