Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State

Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State

A new series of tetrahedral heteroleptic copper(I) complexes exhibiting efficient thermally-activated delayed fluorescence (TADF) in green to orange electromagnetic spectral regions has been developed by using D-A type N^N ligand and P^P ligands. Their structures, electrochemical, photophysical, and...

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Main Authors: Teng Teng, Jinfan Xiong, Gang Cheng, Changjiang Zhou, Xialei Lv, Kai Li
Format: Article
Language:English
Published: MDPI AG 2021-02-01
Series:Molecules
Subjects:
Cu(I) complexes
TADF
intraligand charge-transfer
OLED
solution process
Online Access:https://www.mdpi.com/1420-3049/26/4/1125
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spelling doaj-a9bacbfdc9504333877718c0797f4fab2021-02-21T00:04:28ZengMDPI AGMolecules1420-30492021-02-01261125112510.3390/molecules26041125Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited StateTeng Teng0Jinfan Xiong1Gang Cheng2Changjiang Zhou3Xialei Lv4Kai Li5College of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, ChinaCollege of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, ChinaState Key Laboratory of Synthetic Chemistry, HKU-CAS Joint Laboratory on New Materials, Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, ChinaCollege of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, ChinaCollege of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, ChinaCollege of Materials Science and Engineering, Shenzhen University, Shenzhen 518055, ChinaA new series of tetrahedral heteroleptic copper(I) complexes exhibiting efficient thermally-activated delayed fluorescence (TADF) in green to orange electromagnetic spectral regions has been developed by using D-A type N^N ligand and P^P ligands. Their structures, electrochemical, photophysical, and electroluminescence properties have been characterized. The complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 0.71 at room temperature in doped film and the lifetimes are in a wide range of 4.3–24.1 μs. Density functional theory (DFT) calculations on the complexes reveal the lowest-lying intraligand charge-transfer excited states that are localized on the N^N ligands. Solution-processed organic light emitting diodes (OLEDs) based on one of the new emitters show a maximum external quantum efficiency (EQE) of 7.96%.https://www.mdpi.com/1420-3049/26/4/1125Cu(I) complexesTADFintraligand charge-transferOLEDsolution process
collection DOAJ
language English
format Article
sources DOAJ
author Teng Teng
Jinfan Xiong
Gang Cheng
Changjiang Zhou
Xialei Lv
Kai Li
spellingShingle Teng Teng
Jinfan Xiong
Gang Cheng
Changjiang Zhou
Xialei Lv
Kai Li
Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State
Molecules
Cu(I) complexes
TADF
intraligand charge-transfer
OLED
solution process
author_facet Teng Teng
Jinfan Xiong
Gang Cheng
Changjiang Zhou
Xialei Lv
Kai Li
author_sort Teng Teng
title Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State
title_short Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State
title_full Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State
title_fullStr Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State
title_full_unstemmed Solution-Processed OLEDs Based on Thermally Activated Delayed Fluorescence Copper(I) Complexes with Intraligand Charge-Transfer Excited State
title_sort solution-processed oleds based on thermally activated delayed fluorescence copper(i) complexes with intraligand charge-transfer excited state
publisher MDPI AG
series Molecules
issn 1420-3049
publishDate 2021-02-01
description A new series of tetrahedral heteroleptic copper(I) complexes exhibiting efficient thermally-activated delayed fluorescence (TADF) in green to orange electromagnetic spectral regions has been developed by using D-A type N^N ligand and P^P ligands. Their structures, electrochemical, photophysical, and electroluminescence properties have been characterized. The complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 0.71 at room temperature in doped film and the lifetimes are in a wide range of 4.3–24.1 μs. Density functional theory (DFT) calculations on the complexes reveal the lowest-lying intraligand charge-transfer excited states that are localized on the N^N ligands. Solution-processed organic light emitting diodes (OLEDs) based on one of the new emitters show a maximum external quantum efficiency (EQE) of 7.96%.
topic Cu(I) complexes
TADF
intraligand charge-transfer
OLED
solution process
url https://www.mdpi.com/1420-3049/26/4/1125
work_keys_str_mv AT tengteng solutionprocessedoledsbasedonthermallyactivateddelayedfluorescencecoppericomplexeswithintraligandchargetransferexcitedstate
AT jinfanxiong solutionprocessedoledsbasedonthermallyactivateddelayedfluorescencecoppericomplexeswithintraligandchargetransferexcitedstate
AT gangcheng solutionprocessedoledsbasedonthermallyactivateddelayedfluorescencecoppericomplexeswithintraligandchargetransferexcitedstate
AT changjiangzhou solutionprocessedoledsbasedonthermallyactivateddelayedfluorescencecoppericomplexeswithintraligandchargetransferexcitedstate
AT xialeilv solutionprocessedoledsbasedonthermallyactivateddelayedfluorescencecoppericomplexeswithintraligandchargetransferexcitedstate
AT kaili solutionprocessedoledsbasedonthermallyactivateddelayedfluorescencecoppericomplexeswithintraligandchargetransferexcitedstate
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