Su Zhenpeng, Zhao Bo, Gong Zheng, Peng Yang, Bai Fan, Zheng Huai, Joo Sang Woo
Institute of Technological Sciences, Wuhan University, Wuhan 430072, China.
School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China.
Micromachines (Basel). 2021 Apr 12;12(4):421. doi: 10.3390/mi12040421.
In this paper, a new method to regulate the correlated color temperature (CCT) of white light-emitting diodes (LEDs) is proposed for the single-chip packaging structure, in which the blue light distribution emitted from the chip in the red/yellow phosphor layer was modulated through changing the paraffin-polydimethylsiloxane (PDMS) film transparence and haze. The results show that the transmittance of the paraffin-PDMS film can be modulated from 49.76% to 97.64%, while the haze of that ranges from 88.19% to 63.10%. When the thickness of paraffin-PDMS film is 0.6 mm, and the paraffin-PDMS film concentration is 30 wt%, the CCT of white LED decreases from 15177 K to 3615 K with the increase of thermal load in the paraffin-PDMS film. The modulating range of its CCT reaches 11562 K. The maximum CCT variation at the same test condition is only 536 K in the repeated experiments within one week.
本文针对单芯片封装结构，提出了一种调节白色发光二极管（LED）相关色温（CCT）的新方法，即通过改变石蜡 - 聚二甲基硅氧烷（PDMS）薄膜的透明度和雾度，来调制芯片发出的蓝光在红/黄荧光粉层中的分布。结果表明，石蜡 - PDMS薄膜的透光率可从49.76%调制到97.64%，而雾度则从88.19%变化到63.10%。当石蜡 - PDMS薄膜厚度为0.6 mm且石蜡 - PDMS薄膜浓度为30 wt%时，随着石蜡 - PDMS薄膜内热负荷的增加，白色LED的CCT从15177 K降至3615 K。其CCT的调制范围达到11562 K。在一周内的重复实验中，相同测试条件下CCT的最大变化仅为536 K。
