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Title: Low efficiency roll-off phosphorescent organic light-emitting devices using thermally activated delayed fluorescence hosts materials based 1, 2, 4-triazole acceptor

Abstract

The host in phosphrescent organic light emitting devices (PhOLEDs), showing the thermally activated delayed fluorescence (TADF) charateristic, can effectively overcome the efficiency roll-off. Herein, six bipolar compounds with donor-$π$-acceptor (D-$π$-A) and D-$π$-A-$π$-D structures have been synthesized using 1,2,4-triazole derivative (TAZ) as an acceptor and phenothiazine (PTZ), phenoxazine (PXZ), and 9, 9-dimethylacridane (DMAC) as donors. The molecular structures were confirmed by 1H NMR, 13C NMR and X-ray single-crystal diffractions. The large steric hindrance endows these molecules with typical TADF features, including the small singlet-triplet energy splitting ($$\Delta$$$E_{ST}$$) of 0.08–0.30 eV and completely spatially separate highest occupied molecular orbitals (HOMO) and the lowest unoccupied molecular orbitals (LUMO) electron densities. The PhOLEDs hosted by these novel TADF materials display excellent performances with low efficiency roll-off.

Authors:
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [2];  [2]
  1. Taiyuan Univ. of Technology, Taiyuan (China). Key Lab. of Interface Science and Engineering in Advanced Materials, Ministry of Education; Nanjing Univ. of Posts & Telecommunications, Nanjing (China). Key Lab. for Organic Electronics and Information Displays, Inst. of Advanced Materials (IAM)
  2. Taiyuan Univ. of Technology, Taiyuan (China). Key Lab. of Interface Science and Engineering in Advanced Materials, Ministry of Education
  3. Ames Lab., Ames, IA (United States). Physics & Astronomy Dept.
  4. Iowa State Univ., Ames, IA (United States). Dept. of Electrical and Computer Engineering
Publication Date:
Research Org.:
Ames Lab., Ames, IA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1570450
Alternate Identifier(s):
OSTI ID: 1569739
Report Number(s):
IS-J-10057; IS-J-10006
Journal ID: ISSN 1566-1199
Grant/Contract Number:  
AC 02-07CH11358; 61705156; 21071108; 60976018; 61605138; 201513002-10
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Organic Electronics
Additional Journal Information:
Journal Volume: 74; Journal Issue: C; Journal ID: ISSN 1566-1199
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING

Citation Formats

Xu, Huixia, Zhao, Yaping, Zhang, Jing, Zhang, Di, Miao, Yanqin, Shinar, Joseph, Shinar, Ruth, Wang, Hua, and Xu, Bingshe. Low efficiency roll-off phosphorescent organic light-emitting devices using thermally activated delayed fluorescence hosts materials based 1, 2, 4-triazole acceptor. United States: N. p., 2019. Web. doi:10.1016/j.orgel.2019.06.041.
Xu, Huixia, Zhao, Yaping, Zhang, Jing, Zhang, Di, Miao, Yanqin, Shinar, Joseph, Shinar, Ruth, Wang, Hua, & Xu, Bingshe. Low efficiency roll-off phosphorescent organic light-emitting devices using thermally activated delayed fluorescence hosts materials based 1, 2, 4-triazole acceptor. United States. doi:10.1016/j.orgel.2019.06.041.
Xu, Huixia, Zhao, Yaping, Zhang, Jing, Zhang, Di, Miao, Yanqin, Shinar, Joseph, Shinar, Ruth, Wang, Hua, and Xu, Bingshe. Thu . "Low efficiency roll-off phosphorescent organic light-emitting devices using thermally activated delayed fluorescence hosts materials based 1, 2, 4-triazole acceptor". United States. doi:10.1016/j.orgel.2019.06.041. https://www.osti.gov/servlets/purl/1570450.
@article{osti_1570450,
title = {Low efficiency roll-off phosphorescent organic light-emitting devices using thermally activated delayed fluorescence hosts materials based 1, 2, 4-triazole acceptor},
author = {Xu, Huixia and Zhao, Yaping and Zhang, Jing and Zhang, Di and Miao, Yanqin and Shinar, Joseph and Shinar, Ruth and Wang, Hua and Xu, Bingshe},
abstractNote = {The host in phosphrescent organic light emitting devices (PhOLEDs), showing the thermally activated delayed fluorescence (TADF) charateristic, can effectively overcome the efficiency roll-off. Herein, six bipolar compounds with donor-$π$-acceptor (D-$π$-A) and D-$π$-A-$π$-D structures have been synthesized using 1,2,4-triazole derivative (TAZ) as an acceptor and phenothiazine (PTZ), phenoxazine (PXZ), and 9, 9-dimethylacridane (DMAC) as donors. The molecular structures were confirmed by 1H NMR, 13C NMR and X-ray single-crystal diffractions. The large steric hindrance endows these molecules with typical TADF features, including the small singlet-triplet energy splitting ($\Delta$$E_{ST}$) of 0.08–0.30 eV and completely spatially separate highest occupied molecular orbitals (HOMO) and the lowest unoccupied molecular orbitals (LUMO) electron densities. The PhOLEDs hosted by these novel TADF materials display excellent performances with low efficiency roll-off.},
doi = {10.1016/j.orgel.2019.06.041},
journal = {Organic Electronics},
issn = {1566-1199},
number = C,
volume = 74,
place = {United States},
year = {2019},
month = {6}
}

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