Tuning charge balance in solution-processable bipolar triphenylamine-diazafluorene host materials for phosphorescent devices

Zhaokang Fan; Huiru Zhao; Nengquan Li; Yiwu Quan; Qingmin Chen; Shanghui Ye; Shuhua Li; Ying Wang; Quli Fan; Wei Huang

doi:10.1021/am509014v

Tuning charge balance in solution-processable bipolar triphenylamine-diazafluorene host materials for phosphorescent devices

Zhaokang Fan
, Huiru Zhao
, Nengquan Li
, Yiwu Quan
, Qingmin Chen
, Shanghui Ye
, Shuhua Li
, Ying Wang
, Quli Fan
, Wei Huang

Nanjing University
Nanjing University of Posts and Telecommunications
Nanjing Tech University
CAS - Technical Institute of Physics and Chemistry

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

Three bipolar hosts, namely TPA-DAF, TPA-DAF₂, and TPA-DAF₃, comprising an electron-donating triphenylamine (TPA) group and electron-accepting 4,5-diazafluorene (DAF) units are investigated for phosphorescent organic light-emitting diodes (PhOLEDs). Given the nonplanar structure of the sp³-hybridized C9 atom in DAF unit, these molecules have a highly nonplanar configuration, good film-forming property, and high triplet energy (E_T) of 2.88-2.89 eV. Among them, TPA-DAF shows more balanced carrier injecting/transporting ability, suitable highest occupied molecular orbital (MO) energy level and higher current density, and therefore TPA-DAF-based devices exhibit the best performances, having an extremely slight efficiency roll-off with current efficiency of 20.0 cd/A at 973 cd/m², 19.5 cd/A at 5586 cd/m², and 17.6 cd/A at 9310 cd/m² for blue PhOLEDs; 23.5 cd/A at 1059 cd/m² and 15.3 cd/A at 8850 cd/m² for green PhOLEDs; and 12.2 cd/A at 1526 cd/m², 10.5 cd/A at 5995 cd/m², and 9.2 cd/A at 8882 cd/m² for red PhOLEDs, respectively. The results also provide a direct proof for the influence of charge balance on the device performance.

Original language	English
Pages (from-to)	9445-9452
Number of pages	8
Journal	ACS Applied Materials and Interfaces
Volume	7
Issue number	18
DOIs	https://doi.org/10.1021/am509014v
State	Published - 13 May 2015
Externally published	Yes

Keywords

4,5-diazafluorene
bipolar host
phosphorescent diodes
triphenylamine

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10.1021/am509014v

Cite this

@article{f170b204aa1f41b0a82340a2d2ec5ea9,

title = "Tuning charge balance in solution-processable bipolar triphenylamine-diazafluorene host materials for phosphorescent devices",

abstract = "Three bipolar hosts, namely TPA-DAF, TPA-DAF2, and TPA-DAF3, comprising an electron-donating triphenylamine (TPA) group and electron-accepting 4,5-diazafluorene (DAF) units are investigated for phosphorescent organic light-emitting diodes (PhOLEDs). Given the nonplanar structure of the sp3-hybridized C9 atom in DAF unit, these molecules have a highly nonplanar configuration, good film-forming property, and high triplet energy (ET) of 2.88-2.89 eV. Among them, TPA-DAF shows more balanced carrier injecting/transporting ability, suitable highest occupied molecular orbital (MO) energy level and higher current density, and therefore TPA-DAF-based devices exhibit the best performances, having an extremely slight efficiency roll-off with current efficiency of 20.0 cd/A at 973 cd/m2, 19.5 cd/A at 5586 cd/m2, and 17.6 cd/A at 9310 cd/m2 for blue PhOLEDs; 23.5 cd/A at 1059 cd/m2 and 15.3 cd/A at 8850 cd/m2 for green PhOLEDs; and 12.2 cd/A at 1526 cd/m2, 10.5 cd/A at 5995 cd/m2, and 9.2 cd/A at 8882 cd/m2 for red PhOLEDs, respectively. The results also provide a direct proof for the influence of charge balance on the device performance.",

keywords = "4,5-diazafluorene, bipolar host, phosphorescent diodes, triphenylamine",

author = "Zhaokang Fan and Huiru Zhao and Nengquan Li and Yiwu Quan and Qingmin Chen and Shanghui Ye and Shuhua Li and Ying Wang and Quli Fan and Wei Huang",

note = "Publisher Copyright: {\textcopyright} 2015 American Chemical Society.",

year = "2015",

month = may,

day = "13",

doi = "10.1021/am509014v",

language = "英语",

volume = "7",

pages = "9445--9452",

journal = "ACS Applied Materials and Interfaces",

issn = "1944-8244",

publisher = "American Chemical Society",

number = "18",

}

TY - JOUR

T1 - Tuning charge balance in solution-processable bipolar triphenylamine-diazafluorene host materials for phosphorescent devices

AU - Fan, Zhaokang

AU - Zhao, Huiru

AU - Li, Nengquan

AU - Quan, Yiwu

AU - Chen, Qingmin

AU - Ye, Shanghui

AU - Li, Shuhua

AU - Wang, Ying

AU - Fan, Quli

AU - Huang, Wei

PY - 2015/5/13

Y1 - 2015/5/13

N2 - Three bipolar hosts, namely TPA-DAF, TPA-DAF2, and TPA-DAF3, comprising an electron-donating triphenylamine (TPA) group and electron-accepting 4,5-diazafluorene (DAF) units are investigated for phosphorescent organic light-emitting diodes (PhOLEDs). Given the nonplanar structure of the sp3-hybridized C9 atom in DAF unit, these molecules have a highly nonplanar configuration, good film-forming property, and high triplet energy (ET) of 2.88-2.89 eV. Among them, TPA-DAF shows more balanced carrier injecting/transporting ability, suitable highest occupied molecular orbital (MO) energy level and higher current density, and therefore TPA-DAF-based devices exhibit the best performances, having an extremely slight efficiency roll-off with current efficiency of 20.0 cd/A at 973 cd/m2, 19.5 cd/A at 5586 cd/m2, and 17.6 cd/A at 9310 cd/m2 for blue PhOLEDs; 23.5 cd/A at 1059 cd/m2 and 15.3 cd/A at 8850 cd/m2 for green PhOLEDs; and 12.2 cd/A at 1526 cd/m2, 10.5 cd/A at 5995 cd/m2, and 9.2 cd/A at 8882 cd/m2 for red PhOLEDs, respectively. The results also provide a direct proof for the influence of charge balance on the device performance.

AB - Three bipolar hosts, namely TPA-DAF, TPA-DAF2, and TPA-DAF3, comprising an electron-donating triphenylamine (TPA) group and electron-accepting 4,5-diazafluorene (DAF) units are investigated for phosphorescent organic light-emitting diodes (PhOLEDs). Given the nonplanar structure of the sp3-hybridized C9 atom in DAF unit, these molecules have a highly nonplanar configuration, good film-forming property, and high triplet energy (ET) of 2.88-2.89 eV. Among them, TPA-DAF shows more balanced carrier injecting/transporting ability, suitable highest occupied molecular orbital (MO) energy level and higher current density, and therefore TPA-DAF-based devices exhibit the best performances, having an extremely slight efficiency roll-off with current efficiency of 20.0 cd/A at 973 cd/m2, 19.5 cd/A at 5586 cd/m2, and 17.6 cd/A at 9310 cd/m2 for blue PhOLEDs; 23.5 cd/A at 1059 cd/m2 and 15.3 cd/A at 8850 cd/m2 for green PhOLEDs; and 12.2 cd/A at 1526 cd/m2, 10.5 cd/A at 5995 cd/m2, and 9.2 cd/A at 8882 cd/m2 for red PhOLEDs, respectively. The results also provide a direct proof for the influence of charge balance on the device performance.

KW - 4,5-diazafluorene

KW - bipolar host

KW - phosphorescent diodes

KW - triphenylamine

UR - https://www.scopus.com/pages/publications/84929192104

U2 - 10.1021/am509014v

DO - 10.1021/am509014v

M3 - 文章

AN - SCOPUS:84929192104

SN - 1944-8244

VL - 7

SP - 9445

EP - 9452

JO - ACS Applied Materials and Interfaces

JF - ACS Applied Materials and Interfaces

IS - 18

ER -

Tuning charge balance in solution-processable bipolar triphenylamine-diazafluorene host materials for phosphorescent devices

Abstract

Keywords

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