Exciplex Electroluminescence from Organic Bilayer Devices Composed of Triphenyldiamine and Quinoxaline Derivatives

Abstract

Exciplexes can be used as emission sources in light‐emitting devices (LEDs), as is demonstrated here. High electroluminescence is reported from bilayer organic LEDs in which the emission is confirmed to originate from an exciplex formed at the interface of two organic layers, for example of an aromatic diamine and a quinoxaline derivative, one of which is shown in the Figure.

Ultralow-voltage Auger-electron-stimulated organic light-emitting diodes

“…In addition, exciplex emission is radiative recombination of singlet CT excitons and therefore generally exhibits low efficiency. 24,25 Due to a large separation distance between the electrons and holes, CT excitons have been demonstrated recently to have a very small singlet-triplet energy splitting, which enables an efficient transition from nonradiative triplet states to radiative singlet states via a reverse-intersystem-crossing (RISC) process. 26,27 Therefore, fluorescent OLEDs based on exciplex emission can harvest both singlet and triplet excitons through prompt and delayed fluorescent decay channels.…”

Impact of electric fields on the emission from organic light-emitting diodes based on polyvinylcarbazole (PVK)

“…Recently, a number of papers appeared showing EL spectra of OLEDs to differ substantially from the photoluminescence (PL) spectra of their component materials [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Often, EL spectra show up as red-shifted broad bands that have been mostly assigned as emission from exciplexes formed at the solid interface between a hole-transport layer (HTL) and an electron-transport layer (ETL).…”

Ninhydrin in synthesis of heterocyclic compounds

“…[410][411] Quinoxalines are very important compounds due to their wide spectrum of biological activities such as anticancer, [412][413] antibacterial 414 and activity as kinase inhibitors. 415 It was reported that the Kaupp and co-workers (Scheme 122).…”