Citation: Yun Yang, Lei Zhao, Shu-meng Wang, Jun-qiao Ding, Li-xiang Wang. Synthesis and Characterization of Red-emitting Thermally Activated Delayed Fluorescent Polymers Based on Poly(2,7-carbazole-co-3,3′-dimethyldiphenyl ether) as the Main Chain[J]. Acta Polymerica Sinica, ;2019, 50(7): 685-694. doi: 10.11777/j.issn1000-3304.2018.18266 shu

Synthesis and Characterization of Red-emitting Thermally Activated Delayed Fluorescent Polymers Based on Poly(2,7-carbazole-co-3,3′-dimethyldiphenyl ether) as the Main Chain

Yun Yang ^1,2 ,
Lei Zhao ¹ ,
Shu-meng Wang ^1,, ,
Jun-qiao Ding ^1,2,, ,
Li-xiang Wang ^1,2

1.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022
2.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei 230026

Corresponding author: Shu-meng Wang, wangshumeng@ciac.ac.cn Jun-qiao Ding, junqiaod@ciac.ac.cn
Received Date: 13 December 2018
Revised Date: 19 January 2019
Available Online: 7 March 2019

A series of red-emitting thermally activated delayed fluorescence (TADF) polymers based on poly(2,7-carbazole-co-3,3′ -dimethyldiphenyl ether) (PCzDMPE) main chains, including PCzDMPE-R03, PCzDMPE-R05, PCzDMPE-R07, and PCzDMPE-R10, have been designed and synthesized via Suzuki polycondensation. The thermally stable polymers possessed glass transition temperatures above 90 °C and decomposition temperatures above 410 °C, which is beneficial to the devices of long-term services. As the content of red TADF unit increased, the maximum emission was gradually red-shifted from 577 nm (PCzDMPE-R03) to 584 nm (PCzDMPE-R010), while the film photoluminescence quantum yield (PLQY) dropped correspondingly from 0.47 to 0.21 according to the energy gap law. Meanwhile, they all exhibited an obviously delayed fluorescence with the lifetime of 145 – 161 μs, accompanied by a prompt fluorescence of 4.5 – 6.5 ns. For instance, the temperature-dependent transient photoluminescence spectra measured for PCzDMPE-R07 sample displayed an enhanced delayed fluorescence upon the temperature rise from 150 K to 300 K, indicative of its TADF nature. More importantly, compared with earlier reports of red TADF polymers based on poly(fluorene-co-3,3′-dimethyl diphenyl ether), fluorene being replaced by carbazole in the present work could increase the highest occupied molecular orbital (HOMO) level and thus favor the hole injection. As a consequence, the turn-on voltage of PCzDMPE-R07 nondoped device was significantly reduced from 9.8 V to 5.2 V. PCzDMPE-R07 also outperformed the other candidates in terms of a maximum current efficiency of 3.35 cd/A and a maximum external quantum efficiency (EQE) of 2.03%. For performance optimization, a doped device was then fabricated by dispersing 20 wt% of PCzDMPE-R07 into the 1,3-bis(9H-carbazol-9-yl)benzene (mCP) matrix as an emitting layer. The corresponding current efficiency and EQE were further improved to 7.36 cd/A and 3.77%, respectively. To sum up, the copolymer containing carbazole and 3,3′-dimethyldiphenyl ether provides a favorable backbone framework for the design and synthesis of TADF polymers that possesses high efficiency and low driving voltage simultaneously.
- Carbazole,
- 3,3′-Dimethyldiphenyl ether,
- Thermal activated delayed fluorescence,
- Polymers,
- Red emission
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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Characterization of Red-emitting Thermally Activated Delayed Fluorescent Polymers Based on Poly(2,7-carbazole-co-3,3′-dimethyldiphenyl ether) as the Main Chain

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com