Narrowband blue emission with insensitivity to the doping concentration from an oxygen-bridged triarylboron-based TADF emitter: nondoped OLEDs with a high external quantum efficiency up to 21.4%

Abstract

Blue thermally activated delayed fluorescence (TADF) emitters that can simultaneously achieve narrowband emission and high efficiency in nondoped organic light-emitting diodes (OLEDs) remain a big challenge. Herein, we successfully design...

Carbazole-2-carbonitrile as an acceptor in deep-blue thermally activated delayed fluorescence emitters for narrowing charge-transfer emissions

“…There are only a few reports on boron-containing narrow-emission D-A type TADF emitters in the literature (Table S1 †). 18,[26][27][28][29] As a result, it would be interesting to develop non-boron based narrow emissive D-A type TADF emitters. This report explores a new class of blue D-A type TADF emitters with small FWHMs.…”

Highly Efficient Blue Thermally Activated Delayed Fluorescence Emitters Based on Multi-Donor Modified Oxygen-Bridged Boron Acceptor

“…Besides the modification at the para position of boron, its meta position had also been explored. In 2022, Yang et al reported BO derivatives, TDBA-Cz and DBA-Cz, using 3,6-di-tertbutylcarbazole as the donor [19]. The doped devices based on TDBA-Cz and DBA-Cz achieved high efficiency and high color purity device performance (λ EL = 466/467 nm, FWHM = 47/50 nm, EQE = 31.1%/30.3%), respectively.…”

Rational molecular design of TADF emitters towards highly efficient yellow electroluminescence with a nearly 30% external quantum efficiency and low roll-off

“…30 The TDBA acceptor has been adopted to construct a series of highly efficient blue TADF emitters, while it has seldom been used in long wave emission emitters. 20,22,30–38 By engineering the donor units, highly efficient TADF emitters with short delayed fluorescence lifetimes and long wave emission should be expected. Encouraged by the above results, in this study, two novel TADF emitters, namely PXZBO1 and PXZBO2 , were designed by the combination of a TDBA acceptor with a phenoxazine (PXZ) or a PXZ derivative (DPAPXZ) donor, respectively.…”