基于铈钆共掺杂YAG单晶荧光片的高光效白光LED  

High Luminous Efficacy White LED Based on Cex,Gd Co-doped YAG Single Crystal Phosphors

作　　者：陈慧挺[1] 赫崇君 李自强 高慧芳 冒蓉 刘登飞[1] CHEN Huiting;HE Chongjun;LI Ziqiang;GAO Huifang;MAO Rong;LIU Dengfei(School of Optoelectronic and Information Technology,Zhongshan Torch Polytechnic,Zhongshan 528436,China;Key Laboratory of Space Photoelectric Detection and Perception,Ministry of Industry and Information Technology,School of Astronautics,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Jiangsu Aidi Electromechanical Equipment Industry Co.,Ltd,Nanjing 211101,China;The 55th Research Institute of CETC,Nanjing 210016,China;Northern Information Control Group Ltd.,Nanjing 211153,China)

机构地区：[1]中山火炬职业技术学院光电信息学院,中山528436 [2]南京航空航天大学航天学院,工业和信息化部重点实验室,空间光电探测与感知实验室,南京210016 [3]江苏省埃迪机电设备实业有限责任公司,南京211101 [4]中国电子科技集团第55研究所,南京210016 [5]北方信息控制集团有限公司,南京211153

出　　处：《人工晶体学报》2020年第2期205-209,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(61675095);广东省普通高校特色创新项目(2018GKTSCX046);中山市科技计划项目(2018B125)。

摘　　要：为了满足高功率白光发光二极管(Light-Emitting Diode,LED)对荧光体的高性能要求,对白光LED用CexGd∶YAG单晶荧光材料的制备和光学、电学、热学特性进行了研究。采用提拉法生长了CexGd:YAG(x=0.02,0.04,0.06,0.08)单晶,并借助于X射线衍射(XRD)、吸收光谱、发射光谱等对晶体的光谱特性进行了表征,同时也测试分析了相对荧光强度随温度的变化关系、基于不同Ce 3+浓度CexGd:YAG单晶的白光LED性能参数。结果表明CexGd:YAG单晶在450 nm的蓝光激发下,产生一个500~650 nm的宽峰发射,在100℃高温下,其荧光光强比商用荧光体粉末高出10%。当Ce^3+浓度为6%时,采用CexGd:YAG单晶荧光片的白光LED光效高达153 lm/W,是Ce:YAG和树脂荧光材料白光LED的两倍多。CexGd:YAG单晶荧光片,具有更高更稳定的荧光光强,制作的白光LED光效有明显提升,有望成为新型的商用荧光体。In order to meet the high performance requirements of phosphors for high-power white light-emitting diode(LED),preparation and optical,electrical and thermal properties of CexGd∶YAG single crystals fluorescent materials for white LED were studied.The CexGd:YAG(x=0.02,0.04,0.06,0.08)single crystals were grown by the Czochralski method,and its luminescence properties were characterized via the XRD patterns,absorption and emission spectra.The temperature dependence of relative florescent light intensity and the performances of white LEDs fabricated by CexGd:YAG single crystals with different Ce3^+ concentration were also analyzed.The results indicate that when CexGd:YAG crystal is excited by 450 nm blue light,a broad emission band of 500-650 nm range is produced,and the luminescence intensity is 10% higher than commercial phosphor at 100℃.When the Ce^3+ concentration is 6%,the efficacy of white LED fabricated by CexGd:YAG single crystals is up to 153 lm/W,more than twice the efficacy of white LED with Ce:YAG-resin composite.CexGd:YAG single crystals have higher and more stable florescent light intensity,and the efficacy of white LED has been greatly improved.CexGd:YAG single crystals is expected to become a new type of commercial fluorescent material.

关 键 词：钇铝石榴石(YAG) 铈 钆 晶体生长 高光效 白光发光二极管(LED) 

分 类 号：O482.3[理学—固体物理]