公开(公告)号：US09078331B2

公开(公告)日：2015-07-07

申请号：US13903190

申请日：2013-05-28

Applicant: NATIONAL CENTRAL UNIVERSITY

Inventor： Ching-Cherng Sun ,  Ching-Yi Chen ,  Hsin-Mei Wu ,  Cheng-Chien Chen

IPC: H05B33/14 ,  H05B33/10 ,  H01L33/50 ,  C09K11/77

CPC classification number: H05B33/14 ,  C09K11/7774 ,  H01L33/502 ,  H01L2933/0041 ,  H05B33/10 ,  Y02B20/181

Abstract: A light emitting device is provided to produce white light with a stable correlated color temperature and stable color coordinates. The light emitting device includes a blue LED chip and a yellow phosphor. The blue LED chip has a peak wavelength X slightly smaller than the peak wavelength Y of the phosphor such that when the light emitting device is subjected to a predetermined operating current, the phosphor decays due to thermal effect, and the LED chip has its emission spectrum red-shifted to substantially match with the excitation spectrum of the phosphor. At this time, the excitation ability of the LED chip is increased and causes an increase of yellow power output from the phosphor that substantially compensates a decrease of yellow light output caused by the phosphor.

Abstract translation: 提供发光器件以产生具有稳定的相关色温和稳定色坐标的白光。 发光器件包括蓝色LED芯片和黄色荧光体。 蓝色LED芯片的峰值波长X比荧光体的峰值波长Y稍小，因此当发光元件经受规定的工作电流时，荧光体由于热效应而衰变，LED芯片的发光光谱 红移以与荧光体的激发光谱基本匹配。 此时，LED芯片的激发能力增加，并且导致从荧光体输出的黄色功率的增加，其基本上补偿由磷光体引起的黄光输出的减少。