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| A Technique for Direct Measurement of UV Output of UV-LED with KI/KIO3 Chemical Actinometer |
| ZHANG Lian-feng1,ZHOU Yu1,2,CHANG Bao-yan3,XION Dong4,YAN Jian-chang5,SHEN Cong-min6,WANG Chun-yong2 |
1. Laboratory of Ecology and Environmental Protection, Research Institute of Tsinghua University in Shenzhen, Shenzhen, Guangdong 518057, China
2. School of Chemical & Environmental Engineering, Liaoning University of Technology, Jinzhou, Liaoning 121001, China
3. Wuxi Huazhaohong Photoelectric Technology Co., Ltd, Wuxi, Jiangsu 214112, China
4. Shenzhen Jinghong Lighting Co., Ltd, Shenzhen, Guangdong 518000, China
5. Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
6. Advanced Ultraviolet Optoelectronics Co., Ltd,Changzhi,Shanxi 046000, China |
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Abstract UV-LED is a new generation of UV source, and its UV output is the key parameter. In order to measure the UV output of a UV-LED, a method to use a chemical actinometer to capture all of UV photons from UV-LED is proposed. The total energy of all photons captured in a certain time is the UV output. Since chemical actinometer is liquid, a vortex can be formed by rotation, and then a UV-LED is set inside the vortex. In such a case, UV-LED doesn’t touch the liquid, and the liquid captures all of photons from the UV-LED. Consequently, the UV output of a UV-LED can be accurately measured. In the process of the measurement, the heat generated by UV-LED is led to a water tank to keep the junction temperature of UV-LED to be stable. The KI/KIO3 actinometer is controllable through careful operations. The experimental results indicate that the discrete coefficients of the experimental data are in the range of 0.02~0.079.
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Received: 27 April 2022
Published: 25 June 2023
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2023, Vol. 44 
