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Title: | A tris β-diketonate europium(III) complex based OLED fabricated by thermal evaporation method displaying efficient bright red emission | Authors: | Ilmi, R Zhang, D Dutra, JDL Dege, N Zhou, L Wong, WY Raithby, PR Khan, MS |
Issue Date: | Sep-2021 | Source: | Organic electronics : physics, materials, applications, Sept. 2021, v. 96, 106216 | Abstract: | A new tris β-diketonate europium(III) complex [Eu(btfa)3Py-Im] (Eu-1) (4,4,4-trifluoro-1-phenyl-1,3-butanedione (btfa) and 2-(2-pyridyl)benzimidazole (Py-Im)] has been synthesized and structurally characterized. A single crystal X-ray diffraction analysis shows that Eu-1 is octacoordinated and the coordination sphere is composed of a EuO6N2 core with a trigonal dodecahedral (D2d) geometry. The photophysical properties of Eu-1 were analysed in detail and with the help of the experimental PL data and theoretical modelling, energy transfer rates were calculated, and an energy transfer mechanism is proposed for Eu-1. The complex has been used as the emitting layer (EML) to fabricate organic light emitting diodes (OLEDs). Eight OLEDs, of which four single-EML and four double-EML with varying doping concentration, were fabricated via a thermal evaporation method using Eu-1 as the EML. Under the optimum conditions a highly monochromatic bright red emission (CIEx,y = 0.640, 0.311) with brightness (B) = 896 cd/m2, current efficiency (ηc) = 2.26 cd/A, power efficiency (ηp) = 1.92 lm/W and external quantum efficiency (EQE) = 1.6% at very low Vturn-on = 3.4 V was obtained. | Keywords: | 2-(2-pyridyl)benzimidazole Electroluminescence Energy transfer mechanism Europium(III) Photoluminescence |
Publisher: | Elsevier | Journal: | Organic electronics : physics, materials, applications | ISSN: | 1566-1199 | EISSN: | 1878-5530 | DOI: | 10.1016/j.orgel.2021.106216 | Rights: | © 2021 Elsevier B.V. All rights reserved. © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. The following publication Ilmi, R., et al. (2021). "A tris β-diketonate europium(III) complex based OLED fabricated by thermal evaporation method displaying efficient bright red emission." Organic Electronics 96: 106216 is available at https://dx.doi.org/10.1016/j.orgel.2021.106216. |
Appears in Collections: | Journal/Magazine Article |
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Wong_Tris_Diketonate_Complex.pdf | Pre-Published version | 1.93 MB | Adobe PDF | View/Open |
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