Electric field tunable light emitting diodes containing europium β-diketonates with [2.2]paracyclophane moiety |
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| Affiliation: | 1. Dept. of Molecular Physics, Lodz University of Technology, 116 ?eromskiego Street, 90-924 Lodz, Poland;2. Kotel''nikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, 11-7 Mokhovaya Str., 125009 Moscow, Russia;3. A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilova Str., 119991 Moscow, Russia;4. Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, Polizu Street No. 1, 011061 Bucharest, Romania;5. Laboratoire de Chimie, ENS-CNRS-UCBL, 46 allée d''Italie, 69364 Lyon, Cédex 07, France;1. Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Key Lab of Information Photonic Technique, Xi’an Jiaotong University, Xi’an 710049, China;2. Institute of Applied Physics, Xi’an University, 710065, China;1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;2. Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden 01314, Germany;3. School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China;1. Missouri University of Science and Technology, Department of Chemistry, 400W 11th Street, Rolla, MO, 65409, USA;2. Missouri University of Science and Technology, Department of Mechanical and Aerospace Engineering, Rolla, MO, 65409, USA;3. BK21 Plus, Division of Nano Convergence Technology, Pusan National University, Busan, 609735, South Korea;1. Grupo de Pesquisa em Química de Materiais – (GPQM), Departamento de Ciências Naturais, Universidade Federal de São João del Rei (UFSJ), Campus Dom Bosco, Praça Dom Helvécio, 74, 36301-160, São João del Rei, MG, Brazil;2. Laboratório de Química Teórica e Computacional – (LQTC), Departamento de Ciências Naturais, Universidade Federal de São João del Rei (UFSJ), Campus Dom Bosco, Praça Dom Helvécio, 74, 36301-160, São João del Rei, MG, Brazil;3. Universidade Federal da Integração Latino-Americana (UNILA), Av. Tancredo Neves, 6731 – Bloco 4, Cx P. 2044, CEP: 85867-970, Foz do Iguaçu, PR, Brazil;4. Instituto de Química, UNESP, P.O. Box 355, 14800-970, Araraquara, SP, Brazil;5. Departamento de Física, Universidade Federal de Sergipe, 49100-000, São Cristóvão, SE, Brazil |
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| Abstract: | The synthesis and electroluminescent (EL) properties of two europium complexes with unsymmetrical β-diketonates and 1,10-phenanthroline are reported. The molecules are substituted by functional groups with different donor–acceptor properties and contain 2.2]paracyclophane moiety. They were used to fabricate the organic light emitting diodes (OLEDs). A large emission wavelength tunability by the applied electric field is observed for OLED containing europium β-diketonate substituted by phenyl group, with the maximum of luminance of 8 cd/m2. Such tunability disappears for OLED based on europium β-diketonate substituted by CH3 group, for which the luminance decreases to ca 2.5 cd/m2. Also in that case an emission band in UV disappears. The OLED stability is lower in the latter case too, showing the importance of the substitution on the OLED operation. It shows also a high potential for the electroluminescent properties control and improvement of these Eu based macromolecules through a simple β-diketonate ligand chemical structure modification. |
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| Keywords: | Europium β-diketonate OLED Electroluminescence Luminescence excitation spectra Europium complexes |
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