Fabrication of Phosphor Pillar Based on Electrohydrodynamic for High Angular Color Uniformity of White Light-emitting Diodes
Advanced phosphor coating techniques are urgently required to enhance the angular color uniformity(ACU)for packaging white light-emitting diode(LED).In this letter,wo proposed a method base on electrohydrodynamic(EHD)to fabricating phosphor gel pillar.In the method,the electric field was applied around phosphor gel to induce and adjust the nomal stress on the air-liquid interface.After being dropped onto the LED chip and being controlled by the interface stress,the phosphor gel could be tailored into cone and contacted with the lens,meanwhile heating the sample at 120℃ and maintained for 1 hour.Finally,the phosphor gel pillar was obtained and ACU performances were tested.The experimental results show that the samples with phosphor gel pillar achieve much smaller correlated color temperature deviation(<400K at about 5000K,<800K at about 5000K)than the traditional spherical cap structure.
light-emitting diodes (LEDs) electrohydrodynamic (EHD) phosphor coating angular color uniformity (ACU)
Jingling Zou Feng Han Zefeng Zhang Huai Zheng Sheng Liu Sheng Liu
School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan,Chi School of Power and Mechanical Engineering Wuhan University Wuhan,China School of Power and Mechanical Engineering Wuhan University City,Country
国际会议
上海
英文
1421-1425
2018-08-08（万方平台首次上网日期，不代表论文的发表时间）