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两种荧光粉混合涂覆的白光LED的光谱方程的建立

Establishment of the Spectral Equation of Two Phosphor-Coated White LEDs

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摘要

为了有效地模拟两种荧光粉混合涂覆的白光LED的发光光谱, 选用了硅酸盐系列的绿色荧光粉与高显粉系列的红色荧光粉, 应用英国Edinburgh FLS920P型荧光光谱仪, 对绿色荧光粉与红色荧光粉进行荧光光谱的实验测量, 得到绿色荧光粉发射峰在527 nm, 红色荧光粉发射峰在641 nm。 配置浓度为7%~17%, 比例为3∶1~3∶2的样本, 共144个, 应用杭州远方色谱有限公司的HAAS-2000高精度光谱辐射计测量LED发光光谱, 最后处理数据, 得到拟合函数, 在这些函数的基础上构建出了光谱方程, 该光谱方程是模拟两种荧光粉的浓度和比例的系统方法。 为了较为准确的预测出两种荧光粉混合后涂覆于蓝光芯片的发光光谱, 对于实验中的数据进行了三维曲面拟合, 得出荧光粉的浓度与比例和绿修正系数与红修正系数之间的函数关系式。 将得出的绿修正系数和红修正系数的函数关系式应用到光谱方程中, 得出最终模拟白光LED发光光谱的一种新方法。 并且用了两组的模拟光谱图与实验的光谱图进行对比, 发现两种光谱图的吻合效果都较为良好。 说明这种模拟白光LED的新方法确实可行, 且预测的两种荧光粉混合后涂覆于蓝光芯片的发光光谱较为准确。 该方法将具体的荧光粉的质量比和浓度与LED的发光光谱图联系了起来, 而之前的大多数研究都是将光谱功率分布与LED发光光谱图联系起来, 并未涉及到荧光粉的质量比与浓度。 在建立了具体的光谱方程之后, 可以在没有实验仪器和不做实验的情况下, 根据两种荧光粉的质量比, 以及与AB胶混合后的浓度直接得出最终的模拟白光光谱, 可以摆脱实验仪器以及其他因素的限制。 并且为制备具有特定光谱特性的白光LED提供了新思路, 具有一定的实用价值。

Abstract

In order to effectively simulate the luminescence spectrum of two kinds of phosphor mixed coated white LEDs, the silicate series of green phosphors and high-viscosity series of red phosphors were selected. Fluorescence spectra of green phosphors and red phosphors were measured by the British FLS920P fluorescence spectrometer. The emission peak of green phosphor was 527 nm and the emission peak of red phosphor was 641 nm. Totally, there were 144 samples, which have a concentration ranging from 7% to 17% and a proportion of 3∶1 to 3∶2. The HAAS-2000 high-precision spectroradiometer from Hangzhou Yuanfang Spectrum Co., Ltd. was used to measure the LED luminescence spectrum. Finally, the data were processed to obtain the fitting function. Based on these functions, the spectral equation was constructed. This spectral equation is a systematic method of simulating the concentration and proportion of two phosphors. In order to accurately predict the luminescence spectrum of the two kinds of phosphors mixed and applied to the blue chip, a three-dimensional surface fitting was performed on the data in the experiment, and the relationship between the concentration and proportion of the phosphor and the green correction coefficient and the red correction coefficient was obtained. Applying the obtained functional relationship between the green correction coefficient and the red correction coefficient to the spectral equation, a new method for finally simulating the luminescence spectrum of white LEDs was obtained. Moreover, the simulated spectra of the two groups were compared with the actual experimental spectra, and the results of the two spectra were found to be good. This new method of simulating white LEDs is indeed feasible, and the predicted phosphorescence spectra of the two phosphors coated on the blue chip are more accurate. This method relates the specific phosphor mass ratio and concentration to the luminescence spectrum of the LED, and most previous studies have linked the spectral power distribution to the LED luminescence spectrum, the mass ratio and concentration of the phosphor are not involved, and the specific breakthrough is compared. After the specific spectral equation is established, the final simulated white light spectrum can be directly obtained according to the mass proportion of the two phosphors and the concentration after mixed with the AB glue without the experimental instrument and without the actual experiment. Get rid of the limitations of experimental instruments and other factors. And it provides a new idea for the preparation of white LED with specific spectral characteristics, which has certain practical value.

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中图分类号:O443.5

DOI:10.3964/j.issn.1000-0593(2020)03-0799-05

基金项目:国家自然科学基金项目(61378037, 61178032), 科技部重大仪器专项基金项目(2011YQ0301240904)资助

收稿日期:2019-01-25

修改稿日期:2019-04-20

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许建文:江南大学理学院, 江苏 无锡 214122江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
陈国庆:江南大学理学院, 江苏 无锡 214122江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
吴亚敏:江南大学理学院, 江苏 无锡 214122江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
马超群:江南大学理学院, 江苏 无锡 214122江苏省轻工光电工程技术研究中心, 江苏 无锡 214122
辜 姣:江南大学理学院, 江苏 无锡 214122江苏省轻工光电工程技术研究中心, 江苏 无锡 214122

联系人作者:许建文(1757762435@qq.com)

备注:许建文, 1993年生, 江南大学理学院硕士研究生

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引用该论文

XU Jian-wen,CHEN Guo-qing,WU Ya-min,MA Chao-qun,GU Jiao. Establishment of the Spectral Equation of Two Phosphor-Coated White LEDs[J]. Spectroscopy and Spectral Analysis, 2020, 40(3): 799-803

许建文,陈国庆,吴亚敏,马超群,辜 姣. 两种荧光粉混合涂覆的白光LED的光谱方程的建立[J]. 光谱学与光谱分析, 2020, 40(3): 799-803

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