Synthesis and Photophysical Properties of Ternary β-Diketonate Europium(III) Complexes Incorporating Bipyridine and its Derivatives

Idris Juma Al-Busaidi, Rashid Ilmi, Daynang Zhang, José D.L. Dutra, Willyan Oliveira, Nawal K. Al-Rasbi, Liang Zhou, Wai-Yeung Wong, Paul Raithby, Muhammad Khan

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Abstract

Two new octa-coordinated ternary europium(III) complexes of the type [Eu(btfa)3(Br2-bpy)] (Eu-1) and [Eu(btfa)3(PhE2-bpy)] (Eu-2) (where btfa = 4,4,4-trifluoro-1-phenyl-1,3-butanedione, Br2-bpy = 5,5'-dibromo-2,2'-bipyridine, PhE2-bpy 5,5'-bis(phenylethynyl)-2,2'-bipyridine) together with a previously reported complex [Eu(btfa)3(bpy)] (Eu-3) have been synthesized. The complexes have been characterized by analytical and spectroscopic methods. The photophysical properties of the complexes have also been analyzed both experimentally and theoretically. The contribution of each ligand to the sensitized Eu(III) photoluminescence (PL) has been analyzed and is discussed. An energy transfer (ET) mechanism is proposed and discussed for the sensitized Eu(III) emission using experimental and theoretical data. The Eu(III) complex incorporating the parent bpy showed impressive performance as a double-emitting layer (EML) red organic light emitting diodes (R-OLEDs).
Original languageEnglish
Article number109879
JournalDyes and Pigments
Volume197
Early online date30 Oct 2021
DOIs
Publication statusPublished - 31 Jan 2022

Bibliographical note

Funding Information:
MSK acknowledges His Majesty's Trust Fund for Strategic Research (Grant No. SR/SQU/SCI/CHEM/21/01 ) and The Ministry of Higher Education, Research and Innovation (MoHERI), Oman (Grant: RC/RG-SCI/CHEM/20/01 ) for funding. IJAB thanks Ministry of Education, Sultanate of Oman (MOE) for a Ph.D. scholarship. R. I. thanks His Majesty's Trust Fund for a postdoctoral fellowship. JDLD appreciates the financial support from the Brazilian funding agencies: CAPES , CNPq ( 421733/2018-7 ), FACEPE ( APQ - 0675-1.06/14 ) and FAPITEC-SE (Process N. 019.203.01074/2011-1 ). WFO thanks PIBIC/CNPq/UFS for a scientific initiation fellowship. The computing for this project was performed on the LCAD-UFS (UFS High Performance Computing Laboratory). WYW thanks the Hong Kong Research Grants Council ( PolyU 153058/19P ), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials ( 2019B121205002 ), Hong Kong Polytechnic University ( 1-ZE1C ), Research Institute for Smart Energy (RISE) and the Endowed Professorship in Energy from Ms Clarea Au ( 847S ) for the financial support. LZ is grateful to the financial aid from National Natural Science Foundation of China ( 21771172 ), Youth Innovation Promotion Association of Chinese Academy of Sciences ( 2013150 ). PRR is grateful to the Engineering and Physical Sciences Research Council (EPSRC) for continued funding (Grant EP/K004956/1 ).

Keywords

  • Energy transfer mechanism
  • Organic light emitting diodes
  • Photoluminescence
  • β-diketone

ASJC Scopus subject areas

  • General Chemical Engineering
  • Process Chemistry and Technology

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