梯度封装胶结构设计提升白光LED光色性能

Gradient packaging adhesive structure design to improve the light color performance of white LED modules

提出一种具有梯度双层掺杂纳米颗粒封装胶结构的白光LED模块,采用热溶液法在倒装芯片表面涂覆掺杂一定浓度TiO_(2)纳米颗粒的remote层和荧光胶薄膜层,制备成模块样品。利用仪器设备对样品的光色性能进行测试和机理分析。实验结果表明,在芯片和荧光胶薄膜间添加remote层,中心法线处的光提取率比未涂覆remote层增加了32.35%,拟合直线斜率趋向水平,光子空间分布均匀性改善明显。荧光胶薄膜掺杂SiO_(2)颗粒,随着SiO_(2)掺杂浓度增加,色温分布曲线逐渐平缓,平均色温由掺杂浓度为0%时的6199.66K下降到5103.24K,下降了21.48%。光通量测量值随着SiO_(2)掺杂浓度增加先提升后下降,掺杂浓度为0.6%时,达到最大值181mlm,相较于未掺杂SiO_(2)颗粒提高了9.70%。双层结构白光LED模块界面间通过梯度递减折射率的方式提高光子提取效率,空间颜色的一致性改善明显,为提高白光LED模块的品质提供一种借鉴。

By using the thermal solution method,the surface of the inverted chip was coated with a remote layer and a fluorescent adhesive film layer doped with nanoparticles of a certain concentration,and the gradient double-layer structure white light LED module samples were prepared.The photochromic properties of the samples were tested and the mechanism was analyzed.The results showed that adding remote layer between the chip and fluorescent adhesive film increased the light quantum number at the center normal line by 32.35%compared with the uncoated remote layer,the slope of the fitting line tends to be horizontal,and the uniformity of photon spatial distribution is improved obviously.With the increase of SiO_(2)doping concentration,the color temperature distribution curve gradually becomes flat.The average color temperature decreases from 6199.66 k when the doping concentration is 0%to 5103.24 k,a decrease of 21.48%.The measured value of light flux first increased and then decreased with the increase of SiO_(2)doping concentration.When the doping concentration was 0.6%,the maximum value reached 181 mlm,which increased by 9.70%compared with the undoped SiO_(2)particles.The efficiency of photon extraction is improved by means of gradient decreasing refractive index between the interfaces of double-layer white light LED module,and the consistency of space color is improved obviously,providing a reference for improving the quality of white light LED module.