Investigation of photoluminescence and thermal effect of phosphor films used in phosphor-converted white LEDs

Mengni Zhang, Jiajie Fan, C. Qian, Y. Li, Xuejun Fan, Aimin Ji, Guoqi Zhang
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引用次数: 7

Abstract

By using a blue light source converted by phosphors to obtain white light emission, phosphor-converted white light emitting diodes (pc-white LEDs) are becoming as one of substitutes of traditional general lighting sources due to their advantages in energy saving, environment-friendliness, color controllability and long lifetime. Within pc-white LEDs, the phosphor films consisting of inorganic phosphor powders and silicone have a great effect on the luminous efficacy, color stability and color rendering properties of the LEDs. Additionally, as being close to LED chips, the phosphor film always suffers a high temperature when the LED operates. Thus, the photoluminescence and thermal effect of phosphor films become the essential research topics to identify the resulting failure mechanisms in LEDs. This study selected five widely used inorganic phosphor powers with Garnets, Silicates, Aluminates and Nitrides bases mixed with silicone to prepare the phosphor films. Then, with a 450nm InGaN blue chip as an excitation source, a thermal-controllable platform was installed in an integrating sphere to measure the thermal transient photoluminescence properties of these above prepared phosphor films. Finally, optical simulations using the LightTools software were conducted to predict the spectral power distributions (SPDs) of the pc-white LEDs with selected phosphors films. The simulated SPDs are in reasonable agreement with those measured from experiments. This implies the proposed simulation method can be a useful tool instead of physical experiments in the phosphor design for pc-white LEDs.
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磷光转换白光led用磷光膜的光致发光及热效应研究
磷光转换白光二极管(pc-white LEDs)利用荧光粉转换的蓝色光源获得白光,以其节能、环保、颜色可控性和寿命长等优点成为传统普通照明光源的替代品之一。在pc白光led中,由无机荧光粉和有机硅组成的荧光粉薄膜对led的发光效率、色彩稳定性和显色性有很大的影响。此外,由于靠近LED芯片,荧光粉膜在LED工作时总是受到高温的影响。因此,荧光粉薄膜的光致发光和热效应成为确定led失效机制的重要研究课题。本研究选择了石榴石、硅酸盐、铝酸盐和氮化物等五种广泛使用的无机荧光粉,与硅酮混合制备荧光粉薄膜。然后,以450nm InGaN蓝色芯片为激发源,在积分球中安装热可控平台,测量上述制备的荧光粉膜的热瞬态光致发光性能。最后,利用LightTools软件进行了光学模拟,以预测选择荧光粉薄膜的pc白光led的光谱功率分布(spd)。模拟的spd值与实验值吻合较好。这意味着所提出的模拟方法可以代替物理实验在pc白光led荧光粉的设计有用的工具。
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