远程荧光体白光发光二极管的发光性能
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摘要
研究了高色温和低色温两种球冠状远程荧光粉白光LED在不同电流、不同热沉温度下的发光性能差异.结果表明:在大电流下,LED有源层内由于量子限制斯塔克效应使其峰值波长向短波方向移动,偏离了高色温荧光粉的最佳激发波长,更加接近低色温荧光粉的最佳激发波长.高色温LED的相关色温随电流增加呈上升趋势,低色温LED的相关色温随电流增加呈下降趋势,与它们的量子效率变化引起的色坐标漂移有很大关系.两种LED量子效率和发光效能随热沉温度的升高均呈略微增大的趋势;其中,高色温LED的量子效率和发光效能随电流的增大而减小,而低色温LED的量子效率和发光效能则随电流的增大而升高;高色温LED发光性质较低色温LED好,但色特性的稳定程度不如低色温LED.
The luminous properties of sphere-like remote phosphor white LEDs with high Correlated Color Temperature(CCT)and low CCT were studied under different drive currents and heat sink temperatures. The result shown that the quantum efficiency and luminous efficacy of both LEDs raise with the increase of heat sink temperatures;the high-CCT LED's quantum efficiency and luminous efficacy decrease with rising currents.However,the low-CCT LED shows a reverse trend.The reason is attributed to the quantum confinement stark effect in the active region,which makes the wavelength move towards shortwavelength so as to deviate from the optimum stimulation wavelength of the high-CCT phosphor,but close to the optimum stimulation wavelength of the low-CCT phosphor.The CCT of the high-CCT LED increase with rising currents,again,the low-CCT LED shows a reverse trend with rising currents.This trend is mainly related to the drifting of color coordinates caused by quantum efficiency changing.To sum up,the high-CCT LED possesses better optical properties but inferior color properties than the low-CCT LED.
The luminous properties of sphere-like remote phosphor white LEDs with high Correlated Color Temperature(CCT)and low CCT were studied under different drive currents and heat sink temperatures. The result shown that the quantum efficiency and luminous efficacy of both LEDs raise with the increase of heat sink temperatures;the high-CCT LED's quantum efficiency and luminous efficacy decrease with rising currents.However,the low-CCT LED shows a reverse trend.The reason is attributed to the quantum confinement stark effect in the active region,which makes the wavelength move towards shortwavelength so as to deviate from the optimum stimulation wavelength of the high-CCT phosphor,but close to the optimum stimulation wavelength of the low-CCT phosphor.The CCT of the high-CCT LED increase with rising currents,again,the low-CCT LED shows a reverse trend with rising currents.This trend is mainly related to the drifting of color coordinates caused by quantum efficiency changing.To sum up,the high-CCT LED possesses better optical properties but inferior color properties than the low-CCT LED.
引文
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[2]HU Run,BIN Cao,LIU Zong-yuan,et al.Modeling the light extraction efficiency of bi-layer phosphors in white LEDs[J].IEEE Photonics Technology Letters,2013,25(12):1141.
[3]LUO Xiao-bing,FU Xing,CHEN Fei,et al.Phosphor selfheating in phosphor converted light emitting diode packaging[J].International Journal of Heat and Mass Transfer,2013,58(1):276-281.
[4]GUO Zi-quan,GAO Yun-lin,LU Yi-jun,et al.Spectrum optimization of tricolor white LEDs at fixed correlated color temperature[J].Journal of Optoelectronics·Laster,2011,22(7):992-996.郭自泉,高玉琳,吕毅军,等.固定相关色温下三基色合成白光LED的光谱优化[J].光电子·激光,2011,22(7):992-996.
[5]YU Ren-yong,JIN Shang-zhong,CEN Song-yuan,et al.Effect of the phosphor geometry on the luminous flux of phosphor-converted light-emitting diodes[J].IEEE Photonics Technology Letters,2010,22(23):1765-1767.
[6]LIU Zhi-bin,QIAN Ke-yuan,LUO Yi.Influence of phosphor layers with different shapes on white LED′s CCT uniformity in space[J].Semiconductor Optoelectonics,2012,33(5):651-656,671.刘志彬,钱可元,罗毅.荧光粉层形状对白光LED空间色温均匀性的影响[J].半导体光电,2012,33(5):651-656,671.
[7]KANG Dun-yen,WU Enboa,WANG Da-ming.Modeling white light-emitting diodes with phosphor layers[J].Applied Physics Letters,2006,89(23):231102-1-3.
[8]LIU Zong-yuan,LIU Sheng,WANG Kai,et al.Effects of phosphor′s thickness and concentration on performance of white LEDs[C].Electronic Packaging Technology&High Density Packaging,ICEPT-HDP 2008.International Conference on,IEEE,2008:1-6.
[9]MOON K M,AN S H,KIM H,et al.Phosphor concentration and geometry for high power white light emitting diode[C].OPTO,International Society for Optics and Photonics,2010:76171Y-1-8.
[10]NARENDRAN N.Improved performance white LED[C].Optics&Photonics 2005.International Society for Optics and Photonics,2005:594108-1-6.
[11]ZHU Yi-ting,NARENDRAN N,GU Yi-min.Investigation of the optical properties of YAG∶Ce phosphor[C].Optics&Photonics,International Society for Optics and Photonics,2006:63370S-1-8.
[12]LIU Zong-yuan,LIU Sheng,WANG Kai,et al.Optical analysis of phosphor's location for high-power light-emitting diodes[J].IEEE Transactions on,2009,9(01):65-73.
[13]PARK S C,RHEE I,KIM J Y,et al.Luminous efficiency of open remote phosphor-converted white-light-emitting diodes[J].Journal of the Korean Physical Society,2012,60(7):1191-1195.
[14]WANG Yi,MOU Tong-sheng,LI Li.Characterization and measurement of white LED phosphors[J].Opto-electronic Engineering,2010,37(9):127-132.
[15]LI Bing-qian.Luminous efficiency of 1w-level high power white LED[J].Semiconductor Optoelectronics,2005,26(4):314-316,361.李炳乾.1W级大功率白光LED发光效率研究[J].半导体光电,2005,26(04):314-316,361.
[16]LU Yi-jun,LEI Rui-rui,GAO Yu-lin,et al.Analysis of luminous efficiency of power LED[J].Acta Optica Sinica,2009,29(s2):313-316.吕毅军,雷瑞瑞,高玉琳,等.功率LED发光效率分析[J].光学学报,2009,29(s2):313-316.
[17]TIAN Chuan-jun,ZHANG Xi-yan,ZOU Jun,et al.Temperature effect on the photoelectric parameter of highpower LED illumination system[J].Chinese Journal of Luminescence,2010,31(1):96-100.田传军,张希艳,邹军,等.温度对大功率LED照明系统光电参数的影响[J].发光学报,2010,31(1):96-100.
[18]WU Guo-qing,GUO Wei-ling,ZHU Yan-xu,et al.Effect of driving current on the phosphor conversion efficiency of highpower white LED[J].Journal of Optoelectronics·Laster,2012,3(10):1869-1875.吴国庆,郭伟玲,朱彦旭,等.驱动电流对大功率白光LED荧光粉转换效率的影响[J].光电子·激光,2012,3(10):18691875.
[19]SONG Guo-hua,SONG Jian-xin,MIU Jian-wen,et al.Study on energy conversion efficiency of LED[J].Semiconductor Technology,2008,33(7):592-595,634.宋国华,宋建新,缪建文,等.白光LED能量转换效率的研究[J].半导体技术,2008,33(7):592-595,634.
[20]LIU Li,WU Qing,HUANG Xian,et al.Promoting of the phosphor-based white-LED and optical properties[J].Chinese Journal of Luminescence,2007,28(6):890-894.刘丽,吴庆,黄先等.白光LED荧光粉涂敷工艺及光学性质[J].发光学报,2007,28(06):890-894.