WHITE LIGHT EMITTING DIODE

文件类型：PDF文档
文件大小：59K
PROBLEM TO BE SOLVED : To provide a white light emitting diode (LED) capable of maintaining high reliability for a long period of time by improving temperature cycle resistance, lightfastness, etc. SOLUTION : A lamp house 6 provided with a cup 5 with a reflecting surface 4 is fitted to a printed board 3 having a circuit conductor 2 formed on a substrate 1 made of an insulating base material, a blue LED chip 8 which emits blue light is fixed to a bottom surface 7 of the cup 5, and an electrode formed on an LED chip and a circuit conductor 2 formed on the printed board 3 are connected by a bonding wire 9. The cup 5 is filled with silicone resin 11 in which wavelength converting members 10 made of one of a group of aluminate activated with rare earth, thiogallate activated with rare earth, and orthosilicate activated with rare earth are dispersed, and which consists principally of polydimethyl siloxane obtained by substituting a phenyl group for part of a methyl group.