为了研究大功率白光、蓝光LED在整个寿命中的颜色漂移,选用一系列的大功率白光、蓝光发光二极管分别进行了不同电流的恒流点亮.在点亮不同时间阶段测量了LED的发射光谱、色坐标和色温,研究了在不同电流点亮时的光通量、色坐标和色温的变化,分析了电流、时间等因素对颜色漂移的影响.结果表明,在不同电流点亮及同一电流点亮的不同时间阶段,LED的颜色不同.说明大功率LED的颜色漂移不仅是由荧光粉老化所引起,更主要的因素是材料本身的变化.文章对此进行了初步的分析,为白光LED的应用及进一步研究白光LED颜色漂移提供了参考.
To study color offset in the process of high-power LED life aging, a series of power white and blue LEDs are lighted continuously under invariable current respectively. Emission spectra, color coordinates and color temperature are measured at different period. Their changes are researched. Based on the analysis of cause of color offset, the result is that the color of LEDs are different at different period with the same current and different current lighting. It indicated that the colour offset of high-power LEDs are caused not only by aging of phosphors, but also due to the changes in the material itself. The results will provide a reference to the application of white LED and for the further study.
参考文献
| [1] | 刘行仁,郭光华,林秀华.InGaN蓝光LED的发射光谱、色品质与正向电流的关系[J].照明工程学报,2004,(3):14-18. |
| [2] | Shuji Nakamura.InGaN-based blue light-emitting diodes and laser diodes[J].J.Crystal Growth,1999,201/202:290-295. |
| [3] | 方福波,王矗浩,宋代辉,等.白光LED衰减的光谱分析[J].发光学报,2008,29(2):353-357. |
| [4] | 刘洁,孙家跃.与LED匹配的白光发射荧光体的研究进展[J].化学通报,2005,(6):417-421. |
| [5] | Rossia F,Armania N,Salviatia G,et al.The role of Mg complexes in the degradation of InGN-based LEDs[J].Superlattices and Microstructures,2004,36:859-868. |
| [6] | Manyakhin F,Kovalev A,Yunovich A E.Aging mechanisms of InGaN/AlGaN/GaN light-emitting diodes operating at high currents[J].MRS Internet Journal of Nitride Semiconductor Research,1998,(3):53. |
| [7] | 刘熙娟,温岩,朱绍龙.白光LED的使用寿命的定义和测试方法[J].光源与照明,2001,(4):16-22. |
| [8] | Grzanka S,Franssen G,Targowski G,et al.Role of the electron blocking layer in the low-temperature collapse of electro-luminescence in nitride light-emitting diodes[J].Appl.Phys.Lett.,2007,90(10):103507(1-3). |
| [9] | Lee Sung-Nam,Cho S Y,Ryu H Y,et al.High-power GaN-based blue-viote diodes with AlGaN/GaN multiquanturn barriers[J].Appl.Phys.Lett.,2006,88(11):111101(1-3). |
| [10] | Badgutdinov M L,Korobov E V,Luk'yanov F A,et al.Luminescence spectra,efficiency,and color characteristics of white-light-emitting diodes based on p-n InGaN/GaN heterostructures with phosphor coatings[J].Semiconductors,2006,40(6):739-744. |
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