A Deep-Blue-Emitting Heteroatom-Doped MR-TADF Nonacene for High-Performance Organic Light-Emitting Diodes

Overview

Journal Angew Chem Int Ed Engl

Specialty Chemistry

Date 2022 Dec 8

PMID 36480790

Authors

Subeesh Madayanad Suresh

Le Zhang

David Hall

Changfeng Si

Gaetano Ricci

Tomas Matulaitis

Alexandra M Z Slawin

Stuart Warriner

Yoann Olivier

Ifor D W Samuel

Eli Zysman-Colman

Affiliations

Soon will be listed here.

Abstract

We present a p- and n-doped nonacene compound, NOBNacene, that represents a rare example of a linearly extended ladder-type multiresonant thermally activated delayed fluorescence (MR-TADF) emitter. This compound shows efficient narrow deep blue emission, with a λ of 410 nm, full width at half maximum, FWHM, of 38 nm, photoluminescence quantum yield, Φ of 71 %, and a delayed lifetime, τ of 1.18 ms in 1.5 wt % TSPO1 thin film. The organic light-emitting diode (OLED) using this compound as the emitter shows a comparable electroluminescence spectrum peaked at 409 nm (FWHM=37 nm) and a maximum external quantum efficiency (EQE ) of 8.5 % at Commission Internationale de l'Éclairage (CIE) coordinates of (0.173, 0.055). The EQE values were increased to 11.2 % at 3 wt % doping of the emitter within the emissive layer of the device. At this concentration, the electroluminescence spectrum broadened slightly, leading to CIE coordinates of (0.176, 0.068).

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