Efficient Red Organic Light Emitting Diodes of Nona Coordinate Europium Tris(β-diketonato) Complexes Bearing 4'-Phenyl-2,2':6',2''- terpyridine

Rashid Ilmi; Jingyu Wang; José D.L. Dutra; Liang Zhou; Wei-Yeung Wong; Paul R. Raithby; Muhammad Khan

doi:10.1002/chem.202300376

Efficient Red Organic Light Emitting Diodes of Nona Coordinate Europium Tris(β-diketonato) Complexes Bearing 4'-Phenyl-2,2':6',2''- terpyridine

Rashid Ilmi, Jingyu Wang, José D.L. Dutra, Liang Zhou, Wei-Yeung Wong, Paul R. Raithby, Muhammad Khan

Research output: Contribution to journal › Article › peer-review

Abstract

Two novel nona coordinated Eu(III) complexes [Eu(btfa)3(Ph-TerPyr)] (Eu-1) and
[Eu(NTA)3(Ph-TerPyr)] (Eu-2) have been synthesized and characterized. The structure of the complexes was elucidated by density functional theory (DFT) methods. The experimental photophysical properties of the complexes were investigated and complemented with theoretical calculations. Effective energy transfer (ET) pathways for the sensitized red luminescence is discussed. The complexes were tested as emitting layers (EML) in OLEDs. At the optimum doping
concentration of 4 wt%, the double-EML OLEDs of Eu-1 exhibited red electroluminescence (EL) with an EQE of 4.0% and maximum brightness (B) = 1179 cd/m2, maximum current efficiency (ηc) = 5.64 cd/A, maximum power efficiency (ηp) = 4.78 lm/W with very low turn-on voltage (Vturn-on) =
3.6 V at the current density (J) of 10 mA/cm2. Interestingly, the double-EML OLEDs of Eu-2 at the optimum concentration of 3 wt%, displayed an outstanding EL performance with EQE of 7.32% and B = 838 cd/m2, ηc = 10.19 cd/A, ηp = 10.33 lm/W, and Vturn-on = 3.1 V at J =10 mA/cm2. The EL performance of this device is among the best reported for devices incorporating a europium
complex as a red emitter.

Original language	English
Article number	e202300376
Journal	Chemistry - A European Journal
Early online date	16 Apr 2023
DOIs	https://doi.org/10.1002/chem.202300376
Publication status	E-pub ahead of print - 16 Apr 2023

Keywords

β-diketone
Electroluminescence
Europium(III)
DFT calculations

ASJC Scopus subject areas

Chemistry(all)

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10.1002/chem.202300376

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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

Cite this

@article{46ea30f11d7145f1b87b760d5fa24c6c,

title = "Efficient Red Organic Light Emitting Diodes of Nona Coordinate Europium Tris(β-diketonato) Complexes Bearing 4'-Phenyl-2,2':6',2''- terpyridine",

abstract = "Two novel nona coordinated Eu(III) complexes [Eu(btfa)3(Ph-TerPyr)] (Eu-1) and[Eu(NTA)3(Ph-TerPyr)] (Eu-2) have been synthesized and characterized. The structure of the complexes was elucidated by density functional theory (DFT) methods. The experimental photophysical properties of the complexes were investigated and complemented with theoretical calculations. Effective energy transfer (ET) pathways for the sensitized red luminescence is discussed. The complexes were tested as emitting layers (EML) in OLEDs. At the optimum dopingconcentration of 4 wt%, the double-EML OLEDs of Eu-1 exhibited red electroluminescence (EL) with an EQE of 4.0% and maximum brightness (B) = 1179 cd/m2, maximum current efficiency (ηc) = 5.64 cd/A, maximum power efficiency (ηp) = 4.78 lm/W with very low turn-on voltage (Vturn-on) =3.6 V at the current density (J) of 10 mA/cm2. Interestingly, the double-EML OLEDs of Eu-2 at the optimum concentration of 3 wt%, displayed an outstanding EL performance with EQE of 7.32% and B = 838 cd/m2, ηc = 10.19 cd/A, ηp = 10.33 lm/W, and Vturn-on = 3.1 V at J =10 mA/cm2. The EL performance of this device is among the best reported for devices incorporating a europiumcomplex as a red emitter.",

keywords = "β-diketone, Electroluminescence, Europium(III), DFT calculations",

author = "Rashid Ilmi and Jingyu Wang and Dutra, {Jos{\'e} D.L.} and Liang Zhou and Wei-Yeung Wong and Raithby, {Paul R.} and Muhammad Khan",

note = "MSK acknowledges His Majesty's Trust Fund for Strategic Research (Grant No. SR/SQU/SCI/CHEM/21/01) and The Ministry of Higher Education, Research and Innovation (MoHERI), Oman (Grant: RC/RG-SCI/CHEM/23/01) 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 (FAPITEC/SE/FUNTEC Nº 06/2021), and thanks Gabriel Silva Santos for calculating the ligand decay rates and the emission quantum yield of the compounds. LZ is grateful for the financial aid from the National Natural Science Foundation of China (62174160). WYW thanks the Hong Kong Research Grants Council (PolyU 15305320), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002), the CAS-Croucher Funding Scheme for Joint Laboratories (ZH4A), Hong Kong Polytechnic University, Research Institute for Smart Energy (CDAQ) and the Endowed Professorship in Energy from Miss Clarea 31 | Page Au (847S) for the financial support. PRR is grateful to the Engineering and Physical Sciences Research Council (EPSRC) for funding (Grant EP/K004956/1). Data Availability Statement The data that support the findings of this study are available in the supplementary material of this article. ",

year = "2023",

month = apr,

day = "16",

doi = "10.1002/chem.202300376",

language = "English",

journal = "Chemistry - A European Journal",

issn = "0947-6539",

publisher = "Wiley-Blackwell",

}

TY - JOUR

T1 - Efficient Red Organic Light Emitting Diodes of Nona Coordinate Europium Tris(β-diketonato) Complexes Bearing 4'-Phenyl-2,2':6',2''- terpyridine

AU - Ilmi, Rashid

AU - Wang, Jingyu

AU - Dutra, José D.L.

AU - Zhou, Liang

AU - Wong, Wei-Yeung

AU - Raithby, Paul R.

AU - Khan, Muhammad

N1 - MSK acknowledges His Majesty's Trust Fund for Strategic Research (Grant No. SR/SQU/SCI/CHEM/21/01) and The Ministry of Higher Education, Research and Innovation (MoHERI), Oman (Grant: RC/RG-SCI/CHEM/23/01) 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 (FAPITEC/SE/FUNTEC Nº 06/2021), and thanks Gabriel Silva Santos for calculating the ligand decay rates and the emission quantum yield of the compounds. LZ is grateful for the financial aid from the National Natural Science Foundation of China (62174160). WYW thanks the Hong Kong Research Grants Council (PolyU 15305320), Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials (2019B121205002), the CAS-Croucher Funding Scheme for Joint Laboratories (ZH4A), Hong Kong Polytechnic University, Research Institute for Smart Energy (CDAQ) and the Endowed Professorship in Energy from Miss Clarea 31 | Page Au (847S) for the financial support. PRR is grateful to the Engineering and Physical Sciences Research Council (EPSRC) for funding (Grant EP/K004956/1). Data Availability Statement The data that support the findings of this study are available in the supplementary material of this article.

PY - 2023/4/16

Y1 - 2023/4/16

N2 - Two novel nona coordinated Eu(III) complexes [Eu(btfa)3(Ph-TerPyr)] (Eu-1) and[Eu(NTA)3(Ph-TerPyr)] (Eu-2) have been synthesized and characterized. The structure of the complexes was elucidated by density functional theory (DFT) methods. The experimental photophysical properties of the complexes were investigated and complemented with theoretical calculations. Effective energy transfer (ET) pathways for the sensitized red luminescence is discussed. The complexes were tested as emitting layers (EML) in OLEDs. At the optimum dopingconcentration of 4 wt%, the double-EML OLEDs of Eu-1 exhibited red electroluminescence (EL) with an EQE of 4.0% and maximum brightness (B) = 1179 cd/m2, maximum current efficiency (ηc) = 5.64 cd/A, maximum power efficiency (ηp) = 4.78 lm/W with very low turn-on voltage (Vturn-on) =3.6 V at the current density (J) of 10 mA/cm2. Interestingly, the double-EML OLEDs of Eu-2 at the optimum concentration of 3 wt%, displayed an outstanding EL performance with EQE of 7.32% and B = 838 cd/m2, ηc = 10.19 cd/A, ηp = 10.33 lm/W, and Vturn-on = 3.1 V at J =10 mA/cm2. The EL performance of this device is among the best reported for devices incorporating a europiumcomplex as a red emitter.

AB - Two novel nona coordinated Eu(III) complexes [Eu(btfa)3(Ph-TerPyr)] (Eu-1) and[Eu(NTA)3(Ph-TerPyr)] (Eu-2) have been synthesized and characterized. The structure of the complexes was elucidated by density functional theory (DFT) methods. The experimental photophysical properties of the complexes were investigated and complemented with theoretical calculations. Effective energy transfer (ET) pathways for the sensitized red luminescence is discussed. The complexes were tested as emitting layers (EML) in OLEDs. At the optimum dopingconcentration of 4 wt%, the double-EML OLEDs of Eu-1 exhibited red electroluminescence (EL) with an EQE of 4.0% and maximum brightness (B) = 1179 cd/m2, maximum current efficiency (ηc) = 5.64 cd/A, maximum power efficiency (ηp) = 4.78 lm/W with very low turn-on voltage (Vturn-on) =3.6 V at the current density (J) of 10 mA/cm2. Interestingly, the double-EML OLEDs of Eu-2 at the optimum concentration of 3 wt%, displayed an outstanding EL performance with EQE of 7.32% and B = 838 cd/m2, ηc = 10.19 cd/A, ηp = 10.33 lm/W, and Vturn-on = 3.1 V at J =10 mA/cm2. The EL performance of this device is among the best reported for devices incorporating a europiumcomplex as a red emitter.

KW - β-diketone

KW - Electroluminescence

KW - Europium(III)

KW - DFT calculations

U2 - 10.1002/chem.202300376

DO - 10.1002/chem.202300376

M3 - Article

SN - 0947-6539

JO - Chemistry - A European Journal

JF - Chemistry - A European Journal

M1 - e202300376

ER -

Efficient Red Organic Light Emitting Diodes of Nona Coordinate Europium Tris(β-diketonato) Complexes Bearing 4'-Phenyl-2,2':6',2''- terpyridine

Abstract

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

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