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Article: Stable Tetradentate Gold(III)-TADF Emitters with Close to Unity Quantum Yield and Radiative Decay Rate Constant of up to 2 × 10^6 s−1: High-Efficiency Green OLEDs with Operational Lifetime (LT90) Longer than 1800 h at 1000 cd m−2

TitleStable Tetradentate Gold(III)-TADF Emitters with Close to Unity Quantum Yield and Radiative Decay Rate Constant of up to 2 × 10^6 s−1: High-Efficiency Green OLEDs with Operational Lifetime (LT90) Longer than 1800 h at 1000 cd m−2
Authors
Keywordsgold
organic light-emitting diodes
tetradentate
thermally activated delayed fluorescence
Issue Date14-Nov-2022
PublisherWiley
Citation
Advanced Materials, 2022, v. 34, n. 51 How to Cite?
Abstract

High maximum external quantum efficiency (EQEmax), small efficiency roll-offs, and long operational lifetime at practical luminances are three crucial parameters for commercialization of organic light-emitting diodes (OLEDs). To simultaneously achieve these goals, it is desirable to have the radiative decay rate constant (kr) as large as possible, which, for a thermally activated delayed fluorescent (TADF) emitter, requires both a large S1→S0 radiative decay rate constant (krS) and a small singlet–triplet energy gap (ΔEST). Here, the design of a class of tetradentate gold(III) TADF complexes for narrowing the ΔEST while keeping the krS large is reported. The as-synthesized complexes display green emission with close to unity emission quantum yields, and kr approaching 2 × 106 s−1 in thin films. The vacuum-deposited green OLEDs based on 1 and 4 demonstrate maximum EQEs of up to 24 and 27% with efficiency roll-offs of 5.5 and 2.2% at 1000 cd m−2, respectively; the EQEs maintain high at 10 000 cd m−2 (19% (1) and 24% (4)). A long LT90 device lifetime of 1820 h at 1000 cd m−2 for complex 1 is achieved, which is one of the longest device lifetimes of TADF-OLEDs reported in the literature.


Persistent Identifierhttp://hdl.handle.net/10722/331347
ISSN
2023 Impact Factor: 27.4
2023 SCImago Journal Rankings: 9.191
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorZhou, DL-
dc.contributor.authorTong, GSM-
dc.contributor.authorCheng, G-
dc.contributor.authorTang, YK-
dc.contributor.authorLiu, W-
dc.contributor.authorMa, DG-
dc.contributor.authorDu, LL-
dc.contributor.authorChen, JR-
dc.contributor.authorChe, CM-
dc.date.accessioned2023-09-21T06:54:55Z-
dc.date.available2023-09-21T06:54:55Z-
dc.date.issued2022-11-14-
dc.identifier.citationAdvanced Materials, 2022, v. 34, n. 51-
dc.identifier.issn0935-9648-
dc.identifier.urihttp://hdl.handle.net/10722/331347-
dc.description.abstract<p>High maximum external quantum efficiency (EQE<sub>max</sub>), small efficiency roll-offs, and long operational lifetime at practical luminances are three crucial parameters for commercialization of organic light-emitting diodes (OLEDs). To simultaneously achieve these goals, it is desirable to have the radiative decay rate constant (<em>k</em><sub>r</sub>) as large as possible, which, for a thermally activated delayed fluorescent (TADF) emitter, requires both a large S<sub>1</sub>→S<sub>0</sub> radiative decay rate constant (<em>k</em><sub>r</sub><sup>S</sup>) and a small singlet–triplet energy gap (Δ<em>E</em><sub>ST</sub>). Here, the design of a class of tetradentate gold(III) TADF complexes for narrowing the Δ<em>E</em><sub>ST</sub> while keeping the <em>k</em><sub>r</sub><sup>S</sup> large is reported. The as-synthesized complexes display green emission with close to unity emission quantum yields, and <em>k</em><sub>r</sub> approaching 2 × 10<sup>6</sup> s<sup>−1</sup> in thin films. The vacuum-deposited green OLEDs based on <strong>1</strong> and <strong>4</strong> demonstrate maximum EQEs of up to 24 and 27% with efficiency roll-offs of 5.5 and 2.2% at 1000 cd m<sup>−2</sup>, respectively; the EQEs maintain high at 10 000 cd m<sup>−2</sup> (19% (<strong>1</strong>) and 24% (<strong>4</strong>)). A long LT<sub>90</sub> device lifetime of 1820 h at 1000 cd m<sup>−2</sup> for complex <strong>1</strong> is achieved, which is one of the longest device lifetimes of TADF-OLEDs reported in the literature.<br></p>-
dc.languageeng-
dc.publisherWiley-
dc.relation.ispartofAdvanced Materials-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectgold-
dc.subjectorganic light-emitting diodes-
dc.subjecttetradentate-
dc.subjectthermally activated delayed fluorescence-
dc.titleStable Tetradentate Gold(III)-TADF Emitters with Close to Unity Quantum Yield and Radiative Decay Rate Constant of up to 2 × 10^6 s−1: High-Efficiency Green OLEDs with Operational Lifetime (LT90) Longer than 1800 h at 1000 cd m−2-
dc.typeArticle-
dc.identifier.doi10.1002/adma.202206598-
dc.identifier.scopuseid_2-s2.0-85142125301-
dc.identifier.volume34-
dc.identifier.issue51-
dc.identifier.eissn1521-4095-
dc.identifier.isiWOS:000882939200001-
dc.identifier.issnl0935-9648-

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