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1. 中国科学院长春光学精密机械与物理研究所, 激发态物理重点实验室, 吉林, 长春, 130033
2. 中国科学院, 研究生院, 北京, 100049
纸质出版日期:2007-11-20,
收稿日期:2007-6-25,
修回日期:2007-7-24,
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刘丽, 吴庆, 黄先, 王健, 褚明辉, 张立功, 侯凤勤, 刘学彦, 赵成久, 范翊, 罗劲松, 蒋大鹏. 白光LED荧光粉涂敷工艺及光学性质[J]. 发光学报, 2007,28(6): 890-894
LIU Li, WU Qing, HUANG Xian, WANG Jian, CHU Ming-hui, ZHANG Li-gong, HOU Feng-qin, LIU Xue-yan, ZHAO Cheng-jiu, FAN Yi, LUO Jin-song, JIANG Da-peng. 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, 王健, 褚明辉, 张立功, 侯凤勤, 刘学彦, 赵成久, 范翊, 罗劲松, 蒋大鹏. 白光LED荧光粉涂敷工艺及光学性质[J]. 发光学报, 2007,28(6): 890-894 DOI:
LIU Li, WU Qing, HUANG Xian, WANG Jian, CHU Ming-hui, ZHANG Li-gong, HOU Feng-qin, LIU Xue-yan, ZHAO Cheng-jiu, FAN Yi, LUO Jin-song, JIANG Da-peng. Promoting of the Phosphor-based White-LED and Optical Properties[J]. Chinese Journal of Luminescence, 2007,28(6): 890-894 DOI:
在20mA电流下
对自行设计的白光LED进行测试
发现荧光粉远离芯片封装方法与传统封装方法相比
流明效率提高了20.3%.效率的提高主要是因为减小了LED芯片对荧光粉散射的吸收.同时测得随着正向电流的增加
色坐标x
y的值逐渐减小
色温升高
而光通量呈非线性增加
流明效率逐渐下降.
White light-emitting-diodes(LEDs) are known as a new generation lighting source.The luminous flux
color temperature and color rendering property are the three main index in light source.Using a blue LED with a phosphor layer which is excited by blue light and down-converting to the second light
such as yellow light
white light can be produced.Now white-LED is a hot-spot of research
the point of designing white-LED used for lighting is its colour temperature and efficience
and the phosphor layer in white-LED is very important to this.The placement of the phosphor
the geometry of the encapsulation dome
and the reflector cup influence on the optical loss
and hence on the device efficiency.We can find the energy loss term in the one-dimensional model and observe the phosphor layer thickness and boundary effect.Finally we can optimize the phosphor-type white LEDpackage to obtain higher light extraction efficiency.Recently
it has been demonstrated that a large separation between the phosphor and the primary LED emitter
which we refer to as remote phosphor arrangement
enhances the phosphorescence extraction by reducing the optical power absorbed by the LED chip.The experimental enhancement of phosphor efficiency is 24% for blue-pumped yellow phosphor at 20 mAforward current.This improvement is mainly due to the reason:the phosphor-on-top arrangement reduces absorption of phosphorescence the LED chip.it is not known what will happen to the yellow light when it strikes the phosphor medium.To the best of our knowledge
there are no past studies that have quantified the transmission and reflection properties of light outside the excitation wavelength region of YAG:Ce phosphor.By analysing
the color coordinate
color temperature
Luminous flus
Lumen efficiency varied with forward current.From the result of the experiment
we know that color coordinate x and y is minish varing slowly with the increasing forward cureent.The color coordinate and the color temperature is the same uptrend.The luminous flux increases with increasing forward current
but the lumen efficiency decreases with increasing the forward current.
白光LED色坐标色温光通量流明效率
W-LEDcolor coodinatecolor temperatureluminous fluxlumen efficiency
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