journal article·2024-04-23Open access

Highly Efficient Red-Emitting OLEDs Prepared from Nona-Coordinated Europium(III) Complexes

Rashid Ilmi, Xiaoyang Xia, José D. L. Dutra, Gabriel Silva Santos, Liang Zhou, Wai-Yeung Wong, Paul R. Raithby, Muhammad S. Khan

Abstract

We have designed and synthesized three nona-coordinated organoeuropium complexes (OEuCs) with the general formula [Eu(btfa) 3 (FurTerPy)] ( Eu1 ), [Eu(btfa) 3 (ThioTerPy)] ( Eu2 ), and [Eu(btfa) 3 (NapTerPy)] ( Eu3 ) by employing a primary 4,4,4-trifluoro-1-phenyl-1,3-butanedione (btfa) antenna ligand and three functionalized 2,2′:6′,2″-terpyridine (TerPy) ligands bearing different electron-donating groups at the 4′ position, namely, FurTerPy = 4′-(furan-2-yl)-2,2′:6′,2″-terpyridine; ThioTerPy = 4′-(thiophen-2-yl)-2,2′:6′,2″-terpyridine; and NapTerPy = 4′-(naphthalen-1-yl)-2,2′:6′,2″-terpyridine. The detailed photophysical properties of Eu1, Eu2, and Eu3 were analyzed using both experimental and computational methods. By analyzing the experimental and time-dependent density functional theory (TD-DFT) data in conjunction with the Lanthanide Luminescence Software Package (LUMPAC), we further elucidated the energy transfer processes in the OEuCs. Finally, the complexes were tested as the emitting layer (EML) in a multilayered device to fabricate red organic light-emitting diodes (R-OLED). Through optimization and device engineering, we have achieved a remarkable electroluminescence (EL) performance of maximum current efficiency (η c ) = 12.32 cd/A, maximum power efficiency (η p ) = 11.73 lm/W, and maximum external quantum efficiency (EQE max ) = 10.20%, respectively, for the Eu3 -based double-EML OLED. To the best of our knowledge, this is the highest reported overall EL performance among the OEuCs until now.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Lanthanide and Transition Metal Complexes · Organic Light-Emitting Diodes Research · Magnetism in coordination complexes

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khod 123, Oman

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, Changchun 130022, People’s Republic of China

Pople Computational Chemistry Laboratory, Department of Chemistry, UFS, São Cristóvão 49100-000, Sergipe, Brazil

Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, People’s Republic of China

Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K.

Funding

Engineering and Physical Sciences Research Council · Research Grants Council, University Grants Committee · CAS-Croucher Funding Scheme for Joint Laboratories · Funda??o de Amparo ? Ci?ncia e Tecnologia do Estado de Pernambuco · Ministry of Higher Education, Research and Innovation · Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico · Sultan Qaboos University · Funda??o de Apoio ? Pesquisa e ? Inova??o Tecnol?gica do Estado de Sergipe · National Natural Science Foundation of China · Hong Kong Polytechnic University · Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior · Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials · Research Institute for Smart Energy, Hong Kong Polytechnic University

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