Improving Optical Properties of White LED Fabricated by a Blue LED Chip with Yellow/Red Phosphors | Zendy

Chun Che Lin | Zendy; Yisong Zheng | Zendy; H. Y. Chen | Zendy; Cheng-He Ruan | Zendy; G. W. Xiao | Zendy; RuShi Liu | Zendy

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Improving Optical Properties of White LED Fabricated by a Blue LED Chip with Yellow/Red Phosphors

Author(s) -

Chun Che Lin,

Yisong Zheng,

H. Y. Chen,

Cheng-He Ruan,

G. W. Xiao,

RuShi Liu

Publication year - 2010

Publication title -

journal of the electrochemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.258

H-Index - 271

eISSN - 1945-7111

pISSN - 0013-4651

DOI - 10.1149/1.3465654

Subject(s) - phosphor , color rendering index , color temperature , light emitting diode , materials science , diode , luminous efficacy , optoelectronics , luminescence , thermal stability , white light , activator (genetics) , optics , led lamp , blue light , chemistry , nanotechnology , layer (electronics) , physics , biochemistry , gene , organic chemistry

White light-emitting diodes (LEDs) were fabricated by associating an InGaN-based blue LED chip with highly luminescent phosphors, Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce) and CaSiAlN 3 :Eu 2+ . The thermal stability of these phosphors, depending weakly on the composition and the activator concentration, remains high over a wide range of temperatures (25-300°C). When a mixture of YAG:Ce and CaSiAlN 3 :Eu 2+ was coated on a blue LED, the resultant white LED had a high luminous efficiency of η L = 68 Im/W, a high color rendering index of Ra = 93, and a color temperature of T C = 3007 K (at 50 mA). Additionally, the color coordinates, Ra and T C , of the white LED tend to remain constant against an appreciable variation in applied current.

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