期刊
POLYMERS
卷 13, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/polym13020254
关键词
C-H cross-coupling; D-π -A conjugated polymer; benzotriazole; OLEDs
资金
- NSFC [21604063]
- Natural Science Foundation of Tianjin [18JCZDJC34600]
- Program for Prominent Young College Teachers and Youth Reserve Talent of Tianjin Educational Committee
- Scientific Developing Foundation of Tianjin Education Commission [2017ZD14]
- Undergraduate Innovation and Entrepreneurship Training Program [201910060093]
In this study, four D-pi-A conjugated polymers containing benzotriazole building blocks as acceptor were synthesized via direct C-H cross-coupling polycondensation. Among them, P1 and P2 demonstrated higher molecular weights and better fluorescent quantum efficiency, making them promising lighting emitters for OLEDs with green and red luminescence.
Four D-pi-A conjugated polymers, namely P1-P4, which contain benzotriazole building blocks in their backbone as acceptor, are synthesized via palladium-catalyzed direct C-H cross-coupling polycondensation of 5,6-difluorobenzotriazole with different thiophene derivatives, including 3-octylthiophene, 2,2'-bithiophene, thieno[3,4-b][1,4]dioxine, and 4,4-dioctyl-4H-silolo-[3,2-b:4,5-b']dithiophene as donor units, respectively. Taking the polymer P1 as an example, the chemical structure of the polymer is demonstrated by H-1 and F-19 NMR spectra. The optical, electrochemical, and thermal properties of these polymers are assessed by UV-vis absorption and fluorescence spectroscopy, cyclic voltammetry (CV), and thermal gravimetric analysis (TGA), respectively. DFT simulations of all polymers are also performed to understand their physicochemical properties. Furthermore, P1 and P2, which have relatively higher molecular weights and better fluorescent quantum efficiency than those of P3 and P4, are utilized as lighting emitters for organic light-emitting diodes (OLEDs), affording promising green and red luminescence with 0.07% and 0.14% of maximum external quantum efficiency, respectively, based on a device with an architecture of ITO/PEDOT:PSS/PTAA/the polymer emitting layer/TPBi/LiF/Al.
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