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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 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 EQE = 1.6% at very low Vturn-on = 3.4 V was obtained
Original language | English |
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Article number | 106216 |
Journal | Organic Electronics |
Volume | 96 |
Early online date | 25 May 2021 |
DOIs | |
Publication status | Published - 30 Sept 2021 |
Keywords
- Europium(III)
- photoluminescence
- electroluminescence
- 2-(2-pyridyl)benzimidazole
- energy transfer mechanism
ASJC Scopus subject areas
- Inorganic Chemistry
- Physical and Theoretical Chemistry
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Dive into the research topics of 'A Tris β-Diketonate Europium(III) Complex Based OLED Fabricated by Thermal Evaporation Method Displaying Efficient Bright Red Emission'. Together they form a unique fingerprint.Projects
- 1 Finished
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Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly
Raithby, P., Burrows, A., Carbery, D., Marken, F., Parker, S., Walsh, A. & Wilson, C.
Engineering and Physical Sciences Research Council
1/11/12 → 30/04/18
Project: Research council