Department of Physics; Institute of Advanced Material
A blended bimolecular exciplex formation was demonstrated between two individual donor and acceptor molecules, which are tris(4-carbazoyl-9-ylphenyl)amine (TCTA) and 2,4,6-tris(3′-(pyridin-3-yl)biphenyl-3-yl)-1,3,5-triazine (Tm3PyBPZ). The photoluminescence spectrum of the exciplex in the solid state showed an emission with a peak around 514 nm (∼2.49 eV). By applying this exciplex as an emitting layer, a highly efficient all-fluorescent organic lighting emitting diode with maximum efficiencies of 13.1% and 53.4 lm/W can be realized under an extremely low turn-on voltage of only 2.4 V. The thermally activated delayed fluorescence (TADF) process is believed to be responsible for the excellent device performance.
intermolecular exciplex, organic light-emitting diode (OLED), thermally activated delayed fluorescence (TADF), triplet exciton reharvesting, weak coupled donor and acceptor
Source Publication Title
ACS Applied Materials and Interfaces
American Chemical Society
This document is the unedited Author’s version of a Submitted Work that was subsequently accepted for publication in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review. To access the final edited and published work see http://pubs.acs.org/doi/10.1021/acsami.5b05597.
This work was supported by Research Grants Council (AoE/P-02/12) and Innovation and Technology Commission (UIM/216).
Link to Publisher's Edition
Zhang, Lu, Chao Cai, King Fai Li, Hoi Lam Tam, Kin Long Chan, and Kok Wai Cheah. "Efficient organic light-emitting diode through triplet exciton reharvesting by employing blended electron donor and acceptor as the emissive layer." ACS Applied Materials and Interfaces 7.45 (2015): 24983-24986.