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author：

Ji, Si-Chao (Ji, Si-Chao.) [1] | Zhao, Tianxiang (Zhao, Tianxiang.) [2] | Wei, Zhuangzhuang (Wei, Zhuangzhuang.) [3] | Meng, Lingyi (Meng, Lingyi.) [4] | Tao, Xiao-Dong (Tao, Xiao-Dong.) [5] | Yang, Mingxue (Yang, Mingxue.) [6] | Chen, Xu-Lin (Chen, Xu-Lin.) [7] | Lu, Can-Zhong (Lu, Can-Zhong.) [8]

Indexed by：

EI

Abstract：

Thermally　activated　delayed　fluorescent　(TADF)　materials　have　drawn　widespread　attentions　due　to　their　great　potential　for　practical　applications　in　organic　light-emitting　diodes　(OLEDs).　Deep　understanding　of　the　structure-excited　state-photophysical　property　relationships　is　a　key　to　rationally　design　TADF　emitters.　Herein,　two　new　TADF　molecules,　TBP-DPXZ　and　TBQ-DPXZ,　which　consist　of　locked　(triptycene-fused　dibenzophenazine)　and　unlocked　(triptycene-fused　2,　3-diphenylquinoxaline)　electron-acceptors　respectively　and　phenoxazine　electron　donors　are　reported.　The　comparative　study　reveals　that　the　lock/unlock　strategy　could　substantially　manipulate　the　lowest　locally　excited　(LE)　and　charge　transfer　(CT)　states　of　these　emitters　via　changing　the　acceptor　strength,　structural　rigidity,　and　conjugation　length,　and　in　turn　lead　to　significantly　different　photoluminescence　(PL)　and　electroluminescence　(EL)　performance.　It　is　notable　that　the　unlocked　molecule　TBQ-DPXZ　emits　efficient　green　fluorescence　with　photoluminescence　quantum　yield　of　91%　and　TADF　lifetime　of　3.6　μs　in　doped　film.　The　doped　OLED　based　on　TBQ-DPXZ　achieves　an　external　quantum　efficiency　(EQE)　of　25.1%,　a　current　efficiency　(CE)　of　79.7　cd/　A,　a　power　efficiency　(PE)　of　80.0　lm/W,　and　a　maximum　luminance　of　18400　cd/m2,　which　are　better　than　those　of　the　TBP-DPXZ-based　device　and　are　among　the　best　results　reported　so　far　for　green　TADF-OLEDs.　©　2022　Elsevier　B.V.

Keyword：

Charge transfer Efficiency Electroluminescence Excited states Fluorescence Light Molecules Organic light emitting diodes (OLED) Photoluminescence Quantum efficiency

Community：

  • [ 1 ] [Ji, Si-Chao]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 2 ] [Ji, Si-Chao]College of Chemistry, Fuzhou University, Fuzhou; Fujian; 350108, China
  • [ 3 ] [Ji, Si-Chao]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 4 ] [Zhao, Tianxiang]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 5 ] [Zhao, Tianxiang]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 6 ] [Zhao, Tianxiang]University of Chinese Academy of Sciences, China
  • [ 7 ] [Wei, Zhuangzhuang]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 8 ] [Wei, Zhuangzhuang]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 9 ] [Wei, Zhuangzhuang]College of Chemistry and Materials Science, Fujian Normal University, Fuzhou City; Fujian Province; 350007, China
  • [ 10 ] [Meng, Lingyi]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 11 ] [Meng, Lingyi]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 12 ] [Meng, Lingyi]College of Chemistry and Materials Science, Fujian Normal University, Fuzhou City; Fujian Province; 350007, China
  • [ 13 ] [Tao, Xiao-Dong]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 14 ] [Tao, Xiao-Dong]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 15 ] [Tao, Xiao-Dong]University of Chinese Academy of Sciences, China
  • [ 16 ] [Yang, Mingxue]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 17 ] [Yang, Mingxue]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 18 ] [Chen, Xu-Lin]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 19 ] [Chen, Xu-Lin]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 20 ] [Chen, Xu-Lin]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou; Fujian; 350108, China
  • [ 21 ] [Lu, Can-Zhong]CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou; Fujian; 350002, China
  • [ 22 ] [Lu, Can-Zhong]College of Chemistry, Fuzhou University, Fuzhou; Fujian; 350108, China
  • [ 23 ] [Lu, Can-Zhong]Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials, Xiamen Institute of Rare-earth Materials, Haixi Institutes, Chinese Academy of Sciences, Xiamen; Fujian; 361021, China
  • [ 24 ] [Lu, Can-Zhong]Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou; Fujian; 350108, China
  • [ 25 ] [Lu, Can-Zhong]University of Chinese Academy of Sciences, China

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Chemical Engineering Journal

ISSN： 1385-8947

Year： 2022

Volume： 435

1 5 . 1

JCR@2022

1 3 . 4 0 0

JCR@2023

ESI HC Threshold：66

JCR Journal Grade：1

CAS Journal Grade：1

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WoS CC Cited Count：

SCOPUS Cited Count：

ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 1

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