Bipolar host with multielectron transport benzimidazole units for low operating voltage and high power efficiency solution-processed phosphorescent OLEDs

ACS Applied Materials & Interfaces
Xinxin BanYong Qiu

Abstract

Two soluble bipolar host materials (mCP-BPBI and CP-QPBI), comprising different proportions of hole-transporting carbazole and electron-transporting benzimidazole, were synthesized. Their thermal, physical, and electrochemical properties were characterized. The designated bulky star-shaped structures efficiently suppress the direct intramolecular interaction between the donor and acceptor subunits to give high triplet energies. Through computational studies, varying the ratio of hole- and electron-transporting moieties could significantly change the carrier injection/transporting abilities and charge balance properties of the host materials. Indeed, CP-QPBI with more benzimidazole units shows extremely enhanced current density at the same voltage when compared to mCP-BPBI. The operating voltage of solution-processed phosphorescent light-emitting diodes with CP-QPBI as host were dramatically reduced by ∼3 V compared with the similar devices of mCP-BPBI. At the same time, the power efficiencies were improved for 2-2.5 times at the corresponding voltage. Importantly, both blue and green devices maintain their high efficiencies even at brightness up to 1000 cd m(-2), which clearly demonstrates that the new strategy applied to impro...Continue Reading

References

May 8, 2010·Chemical Society Reviews·Hongbin WuYong Cao
Aug 9, 2011·Journal of Chemical Theory and Computation·Choongkeun LeeKarl Sohlberg

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Citations

Jan 25, 2020·Physical Chemistry Chemical Physics : PCCP·Min-Ji KimKyung-Ryang Wee
Jun 9, 2020·Luminescence : the Journal of Biological and Chemical Luminescence·Jairam TagareSivakumar Vaidyanathan
Feb 12, 2017·ACS Applied Materials & Interfaces·Wen-Cheng ChenChun-Sing Lee
Jun 30, 2019·Organic Letters·Tong-Tong WangZuo-Quan Jiang

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