Chinese Optics, Volume. 17, Issue 2, 468(2024)
A red-emitting copolymer phosphors based on bimetallic Eu-Ir complex for Near-UV chip-based LEDs
Fig. 1. Synthetic route of the bimetallic complex Eu(FIrPic)2(Phen)UA
Fig. 3. FT-IR spectra of the FIrPic, Eu(FIrPic)2(Phen)UA, and PM-Eu-Ir
Fig. 4. UV-vis absorption spectra of the Ir complex FIrPic, bimetallic complex Eu(FIrPic)2(Phen)UA, and phosphorescent copolymer PM-Eu-Ir
Fig. 5. FE-SEM images of the bimetallic complex Eu(FIrPic)2(Phen)UA (a) and phosphorescent copolymer PM-Eu-Ir (b)
Fig. 6. (a) DSC curves and (b) TG-DTG curves of copolymer PM-Eu-Ir
Fig. 7. Fluorescence spectra of (a) the bimetallic complex Eu(FIrPic)2(Phen)UA, (b) phosphorescent copolymer PM-Eu-Ir and (c) the CIE chromaticity coordinates
Fig. 8. Emission images of (a) Ir complex, (b) Eu-Ir bimetallic complex powder, (c) copolymer phosphors, and (d) the red LED lamp-bead under 365 nm UV irradiation
Fig. 9. Fluorescence decay curve of the copolymer PM-Eu-Ir and Eu(FIrPic)2(Phen)UA.
Fig. 10. (a) Electroluminescence (EL) spectra and (b) the luminance–voltage curves of the original 365 nm UV-LED chip with and without PM-Eu-Ir. The inserted photograph is the CIE chromaticity coordinates of photoluminescence
Table 1. FT-IR characteristic peaks of the ligands, complex Eu(FIrPic)2(Phen)UA
View tableView in ArticleTable 1. FT-IR characteristic peaks of the ligands, complex Eu(FIrPic)2(Phen)UA
Complex vC=O(-COOH) $\nu_{{\mathrm{as}}({\mathrm{CH}}_2)} $ $\nu_{{\mathrm{s}}({\mathrm{CH}}_2)} $ νC-OH δC-H νEu-N νC=N FIrPic 1647,1406 - - - −833,762,700 - 1477 Phen - - - - 864,739 - 1493 UA 1711 2925 2855 910 - - - Eu(FIrPic)2(Phen)UA - 2930 2860 - 785,710 581 1414
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Zi-hao WANG, Ya-min YANG, Ai-qin ZHANG, Hu-sheng JIA, Jing JIA. A red-emitting copolymer phosphors based on bimetallic Eu-Ir complex for Near-UV chip-based LEDs[J]. Chinese Optics, 2024, 17(2): 468
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Received: Sep. 2, 2023
Accepted: Nov. 1, 2023
Published Online: Apr. 15, 2024
The Author Email: Jing JIA (jiajing.chn@icloud.com)
