摘要
以Ce:YAG单晶取代传统Ce:YAG荧光粉用于制备白光发光二极管(LED),研究了Ce:YAG单晶厚度及驱动电压的变化对其发射光谱、色坐标、亮度、光视效能和色温的影响。研究结果表明,在基于Ce:YAG单晶的白光LED中,发射光的色坐标以及蓝光与黄绿光之间的相对强度可通过对Ce:YAG单晶片厚度的改变进行调整。在恒定电压驱动下,白光LED样品的亮度、光视效能和色温均随单晶片厚度的减小而增加。当Ce:YAG单晶厚度为0.6mm时,可获得较纯的白发射光,并且其色坐标具有较高的可靠性和稳定性,基本不受驱动电压变化的影响。研究结果表明Ce:YAG单晶是一种可用于新型白光LED的理想荧光材料。
Ce： YAG single crystal for white light emitting diode （LED） is developed to replace conventional Ce：YAG phosphor powder. The effects of changing the Ce： YAG single crystal thickness and the driving voltage on the emission spectra, color coordinates, luminance, luminous efficacy and color temperature of white LED are investigated. Results show that the color coordinates and intensity ratio of blue and yellow-green light can be improved by adjusting the thickness of Ce ： YAG single crystals. With the decrease of Ce ： YAG single crystals＇ thickness, the luminance, luminous efficacy and color temperature of white LED are increased. Pure white emission can be observed when the thickness of Ce： YAG single crystal is 0.6 ram, and its color coordinates are not varied with the change of driving voltage. All results show that Ce：YAG single crystal is a new material for new white LED devices.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2012年第3期246-251,共6页
Acta Optica Sinica
基金
上海市基础重点研究(09JC1406500)资助课题
关键词
光电子学
照明光源
白光发光二极管
CE
YAG单晶
发光性能
optoelectronics
lighting source
white light emitting diode
Ce ： YAG single crystal
luminescentproperties
