Synthesis and Characterization of Red-emitting Thermally Activated Delayed Fluorescent Polymers Based on Poly(2,7-carbazole-<italic style="font-style: italic">co</italic>-3,3′-dimethyldiphenyl ether) as the Main Chain

Yun Yang; Lei Zhao; Shu-meng Wang; Jun-qiao Ding; Li-xiang Wang

doi:10.11777/j.issn1000-3304.2018.18266

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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

Research Article | 更新时间：2021-01-26

- 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
- Acta Polymerica Sinica Vol. 50, Issue 7, Pages: 685-694(2019)
- 作者机构：
  
  1.中国科学院长春应用化学研究所高分子物理与化学国家重点实验室　长春 130022
  2.中国科学技术大学应用化学与工程学院　合肥 230026
- 作者简介：
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2018.18266
  CLC：
- Published：2019-7，
  
  Published Online：7 March 2019，
  
  Received：13 December 2018，
  
  Revised：19 January 2019，
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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 50(7):685-694(2019)
DOI：

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 50(7):685-694(2019) DOI： 10.11777/j.issn1000-3304.2018.18266.

摘要

采用咔唑和3

3'-二甲基二苯醚共聚物作为主链，通过Suzuki聚合方法，设计合成了系列红光热活化延迟荧光(TADF)聚合物PCzDMPE-R03 ~ PCzDMPE-R10. 和基于芴和3

3'-二甲基二苯醚共聚物主链的红光TADF聚合物相比，芴到咔唑的改变，能够有效地增加主链的最高占据分子轨道(HOMO)能级，进而降低空穴注入势垒. 因此，PCzDMPE-R07获得了最优的非掺杂器件性能，启亮电压从原来的9.8 V降低到5.2 V，最大电流效率和外量子效率分别为3.35 cd/A和2.03%. 在此基础上，将其分散在mCP中制备了掺杂器件，电流效率和外量子效率进一步提升到7.36 cd/A和3.77%.

Abstract

A series of red-emitting thermally activated delayed fluorescence (TADF) polymers based on poly(2

7-carbazole-

-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-

-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.

关键词

咔唑33'-二甲基二苯醚热活化延迟荧光聚合物红光

Keywords

Carbazole33′-Dimethyldiphenyl etherThermal activated delayed fluorescencePolymersRed emission

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State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences

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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

DOI：10.11777/j.issn1000-3304.2018.18266

摘要

Abstract

关键词

Keywords

references