Application of strontium silicate yellow phosphor for white light-emitting diodes

Joung Kyu Park; Chang Hae Kim; Seung Hyok Park, D.; Hee Dong Park; Se Young Choi, D.
March 2004
Applied Physics Letters;3/8/2004, Vol. 84 Issue 10, p1647
Academic Journal
In order to develop a yellow phosphor that emits efficiently under the 450–470 nm excitation range, we have synthesized a Eu[sup 2+]-activated Sr[sub 3]SiO[sub 5] yellow phosphor and attempted to develop white light-emitting diodes (LEDs) by combining them with a InGaN blue LED chip (460 nm). Two distinct emission bands from the InGaN-based LED and the Sr[sub 3]SiO[sub 5]:Eu phosphor are clearly observed at 460 nm and at 570 nm, respectively. These two emission bands combine to give a spectrum that appears white to the naked eye. Our results showed that InGaN (460 nm chip)-based Sr[sub 3]SiO[sub 5]:Eu exhibits a better luminous efficiency than that of the industrially available product InGaN (460 nm chip)-based YAG:Ce. © 2004 American Institute of Physics.


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