Synthesis and luminescent properties of ternary complex Eu(UVA)₃Phen in nano-TiO₂

Abstract

By introducing 2-hydroxy-4-methoxy-benzophenone (UVA) and 1,10-phenanthroline (Phen) as the ligands, the ternary rare earth complex of Eu(UVA)₃Phen is synthesized, and it is characterized by elemental analysis, mass spectra (MS) and infrared (IR) and ultraviolet (UV) spectroscopy. Results show that the Eu(III) in complex emits strong red luminescence when it is excited by UV light, and it has higher sensitized luminescent efficiency and longer lifetime. The organic-inorganic thin film of complex Eu(UVA)₃Phen doped with nano-TiO₂ is prepared, and the nano-TiO₂ is used in the luminescence layer to change the luminescence property of Eu(UVA)₃Phen. It is found that there is an efficient energy transfer process between ligands and metal ions. Moreover, in an indium tin oxide (ITO)/poly(N-vinylcar-bazole) (PVK)/Eu(UVA)₃Phen/Al device, Eu³⁺ can be excited by intramolecular ligand-to-metal energy transfer process. The main peak of emission at 613 nm is attributed to ⁵D₀→⁷F₂ transition of the Eu³⁺, and this process results in the enhanced red emission.

Keywords

Ethylene Diamine Tetraacetic Acid / Ethylene Diamine Tetraacetic Acid / Rare Earth Complex / Driving Voltage / Luminescent Efficiency

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This work has been supported by the National Natural Science Foundation of China (No.21346006), the Department of Scientific Research Project in Heilongjiang Province (Nos.B201111 and B201015), the Scientific Research Project of Heilongjiang Province Education Department (Nos.12541783, 12541830, 12541821 and 12531693), the National College Students’ Innovation and Entrepreneurship Training Major Project (No.201310222013), the Interdisciplinary Research Project of Jiamusi University (No.JC2014-005), the Graduate Scientific and Technological Innovation Major Project of Jiamusi University (No.LZR2014_034), and the Jiamusi University Students’ Science and Technology Innovation Project (No.XSYD 2004-020).