Volume 17 Issue 2
Mar.  2024
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WANG Zi-hao, YANG Ya-min, ZHANG Ai-qin, JIA Hu-sheng, XU Bing-she, JIA Jing. A red-emitting copolymer phosphors based on bimetallic Eu-Ir complex for Near-UV chip-based LEDs[J]. Chinese Optics, 2024, 17(2): 468-480. doi: 10.37188/CO.EN-2023-0023
Citation: WANG Zi-hao, YANG Ya-min, ZHANG Ai-qin, JIA Hu-sheng, XU Bing-she, JIA Jing. A red-emitting copolymer phosphors based on bimetallic Eu-Ir complex for Near-UV chip-based LEDs[J]. Chinese Optics, 2024, 17(2): 468-480. doi: 10.37188/CO.EN-2023-0023

A red-emitting copolymer phosphors based on bimetallic Eu-Ir complex for Near-UV chip-based LEDs

doi: 10.37188/CO.EN-2023-0023
Funds:  Supported by National Natural Science Foundation of China (No. 21972103); Research and Development Project of New Materials and Chemical Engineering Research Institute of Shanxi Zhejiang University (No. 2021SX-AT010)
More Information
  • Author Bio:

    WANG Zi-hao (1999—), male, born in Jining,Shandong Province. He received his bachelor's degree from the University of Jinan in 2021 and is now a master's candidate in the School of Taiyuan University of Technology. He is mainly engaged in research on LED light-emitting phosphors. E-mail: wangzihao0331@link.tyut.edu.cn

    JIA Jing (1987—), female, born in Yuanping, Shanxi Province. She received her doctoral degree from Taiyuan University of Technology in 2017. She is currently an intermediate engineer in the College of Aeronautics and Astronautics of TYUT, mainly engaged in the research of flexible LED lighting for the aircraft industries. E-mail: jiajing.chn@icloud.com

  • Corresponding author: jiajing.chn@icloud.com
  • Received Date: 02 Sep 2023
  • Rev Recd Date: 07 Oct 2023
  • Accepted Date: 01 Nov 2023
  • Available Online: 11 Nov 2023
  • In this paper, a new Eu-Ir bimetallic complex Eu(FIrPic)2(Phen)UA is synthesized using the Ir complex FIrPic as ligands for Eu ions and red-emitting phosphorescent copolymer PM-Eu-Ir is successfully prepared via radical polymerization for commercial near UV chip-based LEDs. The Eu3+ ions were found to be effectively sensitizable by adding Ir-complex with enhanced ultra-violet light absorption at around 400 nm without affecting the fluorescence emission characteristic of the Eu3+ ions. The proposed copolymer PM-Eu-Ir exhibits the strongest emission peak at 612 nm with the CIE coordinates (0.461, 0.254) under 365 nm ultra-violet light excitation, which matches well with the 365 nm near-UV chip. The micro-morphology of the red copolymer phosphor PM-Eu-Ir is a typical multilayer spatial network structure; as well as having appreciable red emission and the corresponding fluorescence lifetime of 634.54 μs, it also has excellent thermal stability in a wide range of 25~250 °C. The LEDs fabricated by the copolymer PM-Eu-Ir display red light emission with a 149800 cd/m2 luminance. The results support the potential utilization of prepared copolymer phosphor as a red component in the fabrication of near UV chip-based white LEDs.

     

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