Journal
ORGANIC ELECTRONICS
Volume 96, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2021.106216
Keywords
Europium(III); 2-(2-pyridyl)benzimidazole; Photoluminescence; Energy transfer mechanism; Electroluminescence
Funding
- Sultan Qaboos University (SQU), Oman
- His Majesty's Trust Fund for Strategic Research [SR/SQU/SCI/CHEM/21/01]
- HM's Trust Fund
- Brazilian funding agency: CAPES
- Brazilian funding agency: CNPq [421733/2018-7]
- Brazilian funding agency: FACEPE [APQ - 0675-1.06/14]
- Brazilian funding agency: FAPITEC/SE [019.203.01074/2011-1]
- 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]
- Endowed Professorship in Energy from Ms Clarea Au [847S]
- National Natural Science Foundation of China [21771172]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2013150]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/K004956/1]
- EPSRC [EP/K004956/1] Funding Source: UKRI
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A new tris beta-diketonate europium(III) complex, Eu-1, has been synthesized and characterized for its potential application in OLEDs. The complex showed highly efficient energy transfer rates and a proposed energy transfer mechanism. When used as the emitting layer in OLEDs, Eu-1 exhibited a bright red emission with high brightness, current efficiency, power efficiency, and external quantum efficiency under optimal conditions.
A new tris beta-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 (eta c) = 2.26 cd/A, power efficiency (eta p) = 1.92 lm/W and external quantum efficiency (EQE) = 1.6% at very low Vturn-on = 3.4 V was obtained.
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