Highly Robust CuI -TADF Emitters for Vacuum-Deposited OLEDs with Luminance up to 222 200 cd m-2 and Device Lifetimes (LT90 ) up to 1300 hours at an Initial Luminance of 1000 cd m-2.
Angew Chem Int Ed Engl
; 61(33): e202203982, 2022 Aug 15.
Article
en En
| MEDLINE
| ID: mdl-35647660
ABSTRACT
A critical step in advancing the practical application of copper-based organic light-emitting diodes (OLEDs) is to bridge the large gap between device efficiency and operational stability at practical luminance. Described is a panel of air- and thermally stable two-coordinate CuI emitters featuring bulky pyrazine- (PzIPr) or pyridine-fused N-heterocyclic carbene (PyIPr*) and carbazole (Cz) ligands with enhanced amide-Cu-carbene bonding interactions. These CuI emitters display thermally activated delayed fluorescence (TADF) from the 1 LL'CT(CzâPzIPr/PyIPr*) excited states across the blue to red regions with exceptional radiative rate constants of 1.1-2.2×106 â
s-1 . Vapour-deposited OLEDs based on these CuI emitters showed excellent external quantum efficiencies and luminance up to 23.6 % and 222 200â
cd m-2 , respectively, alongside record device lifetimes (LT90 ) up to 1300â
h at 1000â
cd m-2 under our laboratory conditions, highlighting the practicality of the CuI -TADF emitters.
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En
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Angew Chem Int Ed Engl
Año:
2022
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Article