A Tris β-Diketonate Europium(III) Complex Based OLED Fabricated by Thermal Evaporation Method Displaying Efficient Bright Red Emission

Rashid Ilmi; Dayang  Zhang; José D.L. Dutra; Necmi Dege; Liang Zhou; Wai-Yeung Wong; Paul Raithby; Muhammad Khan

doi:10.1016/j.orgel.2021.106216

A Tris β-Diketonate Europium(III) Complex Based OLED Fabricated by Thermal Evaporation Method Displaying Efficient Bright Red Emission

Rashid Ilmi, Dayang Zhang, José D.L. Dutra, Necmi Dege, Liang Zhou, Wai-Yeung Wong, Paul Raithby, Muhammad Khan

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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
Article number	106216
Journal	Organic Electronics
Volume	96
Early online date	25 May 2021
DOIs	https://doi.org/10.1016/j.orgel.2021.106216
Publication status	Published - 30 Sept 2021

Funding

This work was conducted as part of a Project submitted to Sultan Qaboos University (SQU), Oman for funding from His Majesty’s Trust Fund for Strategic Research. MSK acknowledges His Majesty's Trust Fund for Strategic Research (Grant No. SR/SQU/SCI/CHEM/21/01) for funding. RI thanks HM's Trust Fund for a postdoctoral fellowship. JDLD appreciates the financial support from the Brazilian funding agencies: CAPES , CNPq ( 421733/2018-7 ), FACEPE ( APQ - 0675-1.06/14 ) and FAPITEC/SE (Process N. 019.203.01074/2011-1 ). The computing for this project was performed on the LCAD-UFS (UFS High Performance Computing Laboratory). WYW thanks the 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) and the Endowed Professorship in Energy from Ms Clarea Au (847S) for the financial support. LZ is grateful to the financial aid from National Natural Science Foundation of China ( 21771172 ), Youth Innovation Promotion Association of Chinese Academy of Sciences ( 2013150 ). PRR is grateful to the Engineering and Physical Sciences Research Council (EPSRC) for continued funding (Grant EP/K004956/1 ).

Keywords

Europium(III)
photoluminescence
electroluminescence
2-(2-pyridyl)benzimidazole
energy transfer mechanism

ASJC Scopus subject areas

Inorganic Chemistry
Physical and Theoretical Chemistry

Access to Document

10.1016/j.orgel.2021.106216

Accepted Author VersionAccepted author manuscript, 1.07 MBLicence: CC BY-NC-ND

1 Finished

Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly
Raithby, P. (PI), Burrows, A. (CoI), Lewis, D. (CoI), Marken, F. (CoI), Parker, S. (CoI), Walsh, A. (CoI) & Wilson, C. (CoI)
Engineering and Physical Sciences Research Council
1/11/12 → 30/04/18
Project: Research council

Cite this

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title = "A Tris β-Diketonate Europium(III) Complex Based OLED Fabricated by Thermal Evaporation Method Displaying Efficient Bright Red Emission",

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",

keywords = "Europium(III), photoluminescence, electroluminescence, 2-(2-pyridyl)benzimidazole, energy transfer mechanism",

author = "Rashid Ilmi and Dayang Zhang and Dutra, {Jos{\'e} D.L.} and Necmi Dege and Liang Zhou and Wai-Yeung Wong and Paul Raithby and Muhammad Khan",

year = "2021",

month = sep,

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doi = "10.1016/j.orgel.2021.106216",

language = "English",

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journal = "Organic Electronics",

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T1 - A Tris β-Diketonate Europium(III) Complex Based OLED Fabricated by Thermal Evaporation Method Displaying Efficient Bright Red Emission

AU - Ilmi, Rashid

AU - Zhang, Dayang

AU - Dutra, José D.L.

AU - Dege, Necmi

AU - Zhou, Liang

AU - Wong, Wai-Yeung

AU - Raithby, Paul

AU - Khan, Muhammad

PY - 2021/9/30

Y1 - 2021/9/30

N2 - 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

AB - 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

KW - Europium(III)

KW - photoluminescence

KW - electroluminescence

KW - 2-(2-pyridyl)benzimidazole

KW - energy transfer mechanism

U2 - 10.1016/j.orgel.2021.106216

DO - 10.1016/j.orgel.2021.106216

M3 - Article

SN - 1566-1199

VL - 96

JO - Organic Electronics

JF - Organic Electronics

M1 - 106216

ER -

A Tris β-Diketonate Europium(III) Complex Based OLED Fabricated by Thermal Evaporation Method Displaying Efficient Bright Red Emission

Abstract

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Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly

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