摘要
采用高温压膜工艺,以YAG∶Ce黄色荧光材料和硅胶为原料制备出YAG∶Ce荧光膜复合材料,并与蓝光LED复合封装出pc-WLED.基于Mie理论、荧光光谱仪、快速光谱辐射计和光谱分布测量仪分别对不同荧光材料粒径和浓度制备的膜材料和pc-WLED的光色参数进行了计算测试,并对影响机理进行了相应分析.在相同浓度下,随着粒径减小,膜材料中激发光子平均自由程降低、散射系数升高,被吸收和转换的几率提高,引起膜材料发射强度、pc-WLED发光效率和光色均匀度均相应提高,同浓度下粒径最优值为8.7μm;在相同粒径下,膜材料发射强度、pc-WLED发光效率和光色均匀度与浓度成正比关系;基于发光效率、光色均匀度、色温和荧光材料用量等因素交叉综合评价,当浓度为4%,粒径为8.7μm时为最优参数,pc-WLED色温为5 514K,发光效率为136.8lm/W(@300mA,6.6V),光色均匀度为0.759,色坐标x=0.332 2,y=0.359 6,色点位于黑体辐射曲线附近,在不同电流下,pcWLED光通量和发光效率满足线性变化,即光通量:y=0.6816x+63.121,R2=0.995 7,发光效率:y=-0.062 8x+155.2,R2=0.991 6.该膜材料在pc-WLED中的应用是可行的,同时所获得的相关规律对于实际应用具有一定的参考作用.
High temperature molding technology was used to prepare YAG∶Ce phosphor film composite material with YAG∶Ce and silica gel as raw material,and the white light LED was packaged with blue LED light source.Based on the Mie theory,fluorescence spectrometer,rapid spectral radiometer and spectral distribution meter,the color parameters of film material and white LED were calculated and measured,and the influence mechanism of the particle size and concentration on the parameters were analyzed.At the same concentration,with the decreasing of the particle size,the mean free path decrease and the scattering coefficient and probability of absorption and conversion of the excited photon in the film material increase accordingly,The emission intensity of the film material,the luminous efficiency and homogeneity of light color of white LED are all increase correspondingly,the optimum value of the particle size is 8.7μm at the same concentration;At the same particle size,along with the increasing of the concentration.The emission intensity of the film material,the luminous flux and photochromic uniformity of the white LED are also increase correspondingly.When the concentration is 4%and particle size is 8.7μm,the white LED color temperature is 5 514 K,the luminous efficiency is 136.8 lm/W(@300 mA,6.6 V),value of homogeneity of light color is 0.759,color coordinates x=0.332 2,y=0.359 6,the color point is located in the positive white light area near the blackbody radiation curve,which is the best concentration.Under different currents,the luminous efficiency and efficiency of white LED are linear,luminous flux:y=0.681 6x+63.121,R^2=0.995 7,luminous efficiency:y=-0.062 8x+155.2,R^2=0.991 6.This study shows the feasibility of flim material in white LED applications,and the relevant laws obtained are of reference for practical applications.
作者
徐赛赛
魏建君
杨刘琨
潘志华
XU Sai-sai;WEI Jian-jun;YANG Liu-kun;PAN Zhi-hua(College of Material Science and Engineering,Nanjing Tech University,Nanjing 210009 China)
出处
《光子学报》
EI
CAS
CSCD
北大核心
2018年第9期49-57,共9页
Acta Photonica Sinica
基金
国家重点研发计划(Nos.2017YFB0404300
2017YFB0404301)资助~~
关键词
pc-WLED
YAG∶Ce荧光膜复合材料
粒径
浓度
发光效率
光色均匀度
Phosphor converted white LED
YAG∶Ce phosphor film composite material
Particle size
Concentration
Luminous efficiency
Homogeneity of light color
作者简介
徐赛赛(1992-),男,硕士研究生,主要研究方向为机-无机复合材料.Email:bangzhu.1234@163.com;导师(通讯作者):潘志华(1959-),男,教授,博士,主要研究方向为功能材料.Email:funmat_123@163.com。
