White organic light emitting diodes of red emitting octa-coordinated tris(β-diketonato) europium(III) ternary complex Muhammad S. Khan and Rashid Ilmi Department of Chemistry, Sultan Qaboos University, P. O. Box 36, Al Khod 123, Oman Muhammad S. Khan : msk.squ.edu@gmail.com;msk@squ.edu.om; [1] complex [hexafluoroacetylacetone; Hhfaa & 2-(4-Thiazolyl) benzimidazole; TB-Im) has been synthesized and characterized. The structure, established by single crystal X-ray diffraction analysis shows that the coordination sphere is composed of a EuO 6 N 2 core (octacoordinated). Continuous shape measures (CShMs) revealed that the geometry around Eu(III) is trigonal dodecahedral with an approximate D 2d symmetry. The complex exhibits pure red emission with large photoluminescence quantum yield (PLQY () = 47.00%). Finally, it was employed as an emitting layer (EML). At 4 wt% doping concentration, it displays white electroluminescence (EL) with the brightness (B) = 364.1 cd/m 2 at very low turn-on voltage (V turn-on ) = 4.6 V. References 1. R. Ilmi, J. Yin, J.D.L. Dutra, N.K. Al Rasbi, W.F. Oliveira, L. Zhou, W.Y. Wong, P.R. Raithby, M.S. Khan, Dalton Trans, 51 (2022) 14228-14242. https://doi.org/10.1039/D2DT01873J A new octa-coordinated [Eu(hfac) 3 (TB-Im)]
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