A star-shaped bipolar host material based on carbazole and dimesitylboron moieties for fabrication of highly efficient red, green and blue electrophosphorescent devices

Heping Shi*, Dehua Xin, Xiuqing Dong, Jian Xin Dai, Xiaohuan Wu, Yanqin Miao, Li Fang, Hua Wang, Martin M F CHOI

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

A new bipolar host material based on carbazole and dimesitylboron moieties, 3,6-bis(dimesitylboryl)-9-(4-(dimesitylboryl)phenyl) carbazole (BDDPC), has been successfully synthesised and characterised by elemental analysis, nuclear magnetic resonance spectroscopy, mass spectrometry and thermogravimetric analysis. The electrochemical and photophysical properties of BDDPC are studied by both experimental and theoretical methods. BDDPC exhibits excellent thermal stability (Td = 234 °C), electrochemical stability, high fluorescence quantum yield (0.95) and high triplet energy (2.83 eV). A red phosphorescent organic light-emitting diode (PhOLED) device comprising BDDPC as the host material and Os(bpftz)2(PPh2Me)2 as the dopant is fabricated and displays promising electrophosphorescence properties with a turn-on voltage of 3.0 V, a maximum brightness of 12337 cd m-2 and a maximum current efficiency of 11.04 cd A-1. Similarly, BDDPC is used to fabricate a green PhOLED device with Ir(ppy) 2(acac) as the dopant, possessing a turn-on voltage of 2.5 V, a maximum brightness of 26473 cd m-2 and a maximum current efficiency of 38.60 cd A-1. Furthermore, a blue PhOLED device with BDDPC as the host material and FIrpic as the dopant is fabricated with a turn-on voltage of 3.0 V, a maximum brightness of 7622 cd m-2 and a maximum current efficiency of 7.39 cd A-1. It is anticipated that BDDPC has great potential in manufacturing PhOLED devices for display or lighting applications.

Original languageEnglish
Pages (from-to)2160-2168
Number of pages9
JournalJournal of Materials Chemistry C
Volume2
Issue number12
DOIs
Publication statusPublished - 28 Mar 2014

Scopus Subject Areas

  • Chemistry(all)
  • Materials Chemistry

Fingerprint

Dive into the research topics of 'A star-shaped bipolar host material based on carbazole and dimesitylboron moieties for fabrication of highly efficient red, green and blue electrophosphorescent devices'. Together they form a unique fingerprint.

Cite this