Publication Date

11-2019

Department

Ames Laboratory; Physics and Astronomy; Microelectronics Research Center (MRC)

Campus Units

Physics and Astronomy, Ames Laboratory, Microelectronics Research Center (MRC)

OSTI ID+

1570450; 1569739

Report Number

IS-J 10006; IS-J 10057

DOI

10.1016/j.orgel.2019.06.041

Journal Title

Organic Electronics

Volume Number

74

First Page

13

Last Page

22

Abstract

The host in phosphrescent organic light emitting devices (PhOLEDs), showing the thermally activated delayed fluorescence (TADF) charateristic, can effectively overcome the efficiency roll-off. Herein, six bipolar compounds with donor-π-acceptor (D-π-A) and D-π-A-π-D structures have been synthesized using 1,2,4-triazole derivative (TAZ) as an acceptor and phenothiazine (PTZ), phenoxazine (PXZ), and 9, 9-dimethylacridane (DMAC) as donors. The molecular structures were confirmed by 1H NMR, 13C NMR and X-ray single-crystal diffractions. The large steric hindrance endows these molecules with typical TADF features, including the small singlet-triplet energy splitting (Delta E-ST) of 0.08–0.30 eV and completely spatially separate highest occupied molecular orbitals (HOMO) and the lowest unoccupied molecular orbitals (LUMO) electron densities. The PhOLEDs hosted by these novel TADF materials display excellent performances with low efficiency roll-off.

DOE Contract Number(s)

AC 02-07CH11358; 61705156; 21071108; 60976018; 61605138; 201513002-10

Language

en

Publisher

Iowa State University Digital Repository, Ames IA (United States)

Share

COinS