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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
- Source :
-
Angewandte Chemie . 8/15/2022, Vol. 134 Issue 33, p1-9. 9p. - Publication Year :
- 2022
-
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 1LL′CT(Cz→PzIPr/PyIPr*) excited states across the blue to red regions with exceptional radiative rate constants of 1.1–2.2×106 s−1. Vapour‐deposited OLEDs based on these CuI emitters showed excellent external quantum efficiencies and luminance up to 23.6 % and 222 200 cd m−2, respectively, alongside record device lifetimes (LT90) up to 1300 h at 1000 cd m−2 under our laboratory conditions, highlighting the practicality of the CuI‐TADF emitters. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00448249
- Volume :
- 134
- Issue :
- 33
- Database :
- Academic Search Index
- Journal :
- Angewandte Chemie
- Publication Type :
- Academic Journal
- Accession number :
- 158429562
- Full Text :
- https://doi.org/10.1002/ange.202203982