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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
Title | 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 |
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Authors | |
Keywords | gold organic light-emitting diodes tetradentate thermally activated delayed fluorescence |
Issue Date | 14-Nov-2022 |
Publisher | Wiley |
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 Identifier | http://hdl.handle.net/10722/331347 |
ISSN | 2023 Impact Factor: 27.4 2023 SCImago Journal Rankings: 9.191 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Zhou, DL | - |
dc.contributor.author | Tong, GSM | - |
dc.contributor.author | Cheng, G | - |
dc.contributor.author | Tang, YK | - |
dc.contributor.author | Liu, W | - |
dc.contributor.author | Ma, DG | - |
dc.contributor.author | Du, LL | - |
dc.contributor.author | Chen, JR | - |
dc.contributor.author | Che, CM | - |
dc.date.accessioned | 2023-09-21T06:54:55Z | - |
dc.date.available | 2023-09-21T06:54:55Z | - |
dc.date.issued | 2022-11-14 | - |
dc.identifier.citation | Advanced Materials, 2022, v. 34, n. 51 | - |
dc.identifier.issn | 0935-9648 | - |
dc.identifier.uri | http://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.language | eng | - |
dc.publisher | Wiley | - |
dc.relation.ispartof | Advanced Materials | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | gold | - |
dc.subject | organic light-emitting diodes | - |
dc.subject | tetradentate | - |
dc.subject | thermally activated delayed fluorescence | - |
dc.title | 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 | - |
dc.type | Article | - |
dc.identifier.doi | 10.1002/adma.202206598 | - |
dc.identifier.scopus | eid_2-s2.0-85142125301 | - |
dc.identifier.volume | 34 | - |
dc.identifier.issue | 51 | - |
dc.identifier.eissn | 1521-4095 | - |
dc.identifier.isi | WOS:000882939200001 | - |
dc.identifier.issnl | 0935-9648 | - |