Citation: Ting Zhang, Dong-Qing Xu, Jun-Ming Chen, Ping Zhang, Xu-Chun Wanga. Synthesis and characterization of carbazole-based dendrimers as bipolar host materials for green phosphorescent organic light emitting diodes[J]. Chinese Chemical Letters, ;2016, 27(03): 441-446. doi: 10.1016/j.cclet.2015.12.028 shu

Synthesis and characterization of carbazole-based dendrimers as bipolar host materials for green phosphorescent organic light emitting diodes

a.
a. School of Chemistry and Material Engineering, Anhui Science and Technology University, Fengyang 233100, China;
b.
b. Center of Analysis and Measurement, Anhui Science and Technology University, Fengyang 233100, China

Corresponding author: Ting Zhang,
Received Date: 7 July 2015
Available Online: 10 September 2015
Fund Project: We thank the Natural Science Foundation of Anhui Province (Nos.KJ2013A079, KJ2016A184) (Nos.KJ2013A079, KJ2016A184)

Agroup of novel, carbazole-based dendrimers comprised of the electron-accepting dibenzothiophene core and the electron-donating oligo-carbazole dendrons, namely G1SF and G2SF, are synthesized utilizing the Ullmann C-N coupling reaction. The dendrimers are designed in such a way to show good solubility in common organic solvents, excellent thermochemical stability withdecomposition temperatures (T_d) upto 430℃, and high HOMO levels in a range from -5.45 eV to -5.37 eV. Results of density functional theory calculations (DFT) indicate G2SF has an almost complete separation ofHOMOandLUMOlevels at the holeand electron-transporting moieties; while G1SF exhibits only partial separation of the HOMO and LUMO levels possibly due to intramolecular charge transfer. Green phosphorescent OLEDs were fabricated by the spin coating method with the dendrimers as hosts and traditional green iridium phosphor as doped emitter. Under ambient conditions, a maximumluminance efficiency (η_L) of 19.83 cd A^-1 and a maximum external quantum efficiency of 5.85% are achieved for G1SF, and 15.50 cd A^-1 and 4.57% for G2SF.
- OLEDs,
- Bipolar host materials,
- Dendrimer,
- Carbazole,
- Dibenzothiophene
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