Heterojunction OLEDs fabricated by Eu ternary complexes with conducting secondary ligands

M. K. Lam; K. L. Kwok; S. C. Tse; S. K. So; J. B. Yuan; Louis M. Leung; M. L. Gong

doi:10.1016/j.optmat.2005.09.017

Heterojunction OLEDs fabricated by Eu ternary complexes with conducting secondary ligands

M. K. Lam, K. L. Kwok, S. C. Tse, S. K. So^*, J. B. Yuan, Louis M. Leung, M. L. Gong

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › peer-review

14 Citations (Scopus)

Abstract

A series of Eu ternary complexes with charge conducting secondary ligands were examined as potential light-emitting materials for organic light-emitting diodes (OLEDs). The Eu complex contains an imidazole-based secondary ligand and is electron-conducting. Simple heterojunction OLEDs can be fabricated with a structure ITO/CuPc/TPD/Eu complex/cathode where ITO = indium-tin-oxide, CuPc = copper phthalocyanine, TPD = N,N-diphenyl-N,N′-bis(3-methylphenyl)(1, 1′-biphenyl)-4,4′-diamine. The Eu complex plays the dual role of electron-transporting and light-emitting layer. Sharp red emission can be observed at about 612 nm. The OLEDs have a current efficiency of about 0.5 cd/A (at about 20 mA/cm²) and a maximum luminance between 150 and 200 cd/m². The effects of various substituted imidazole moieties on the electrical properties of the on the OLEDs will be discussed. It is shown that the Eu complex with unsubstituted imidazole has electron mobility ∼10 ^-5 cm² V^-1 s^-1, and should be a very useful material for fabricating red OLEDs with simple device structure.

Original language	English
Pages (from-to)	709-713
Number of pages	5
Journal	Optical Materials
Volume	28
Issue number	6-7
DOIs	https://doi.org/10.1016/j.optmat.2005.09.017
Publication status	Published - May 2006

Scopus Subject Areas

Electronic, Optical and Magnetic Materials
General Computer Science
Atomic and Molecular Physics, and Optics
Spectroscopy
Physical and Theoretical Chemistry
Organic Chemistry
Inorganic Chemistry
Electrical and Electronic Engineering

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10.1016/j.optmat.2005.09.017

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@article{23c3820f4ec541d887e872b86b71736a,

title = "Heterojunction OLEDs fabricated by Eu ternary complexes with conducting secondary ligands",

abstract = "A series of Eu ternary complexes with charge conducting secondary ligands were examined as potential light-emitting materials for organic light-emitting diodes (OLEDs). The Eu complex contains an imidazole-based secondary ligand and is electron-conducting. Simple heterojunction OLEDs can be fabricated with a structure ITO/CuPc/TPD/Eu complex/cathode where ITO = indium-tin-oxide, CuPc = copper phthalocyanine, TPD = N,N-diphenyl-N,N′-bis(3-methylphenyl)(1, 1′-biphenyl)-4,4′-diamine. The Eu complex plays the dual role of electron-transporting and light-emitting layer. Sharp red emission can be observed at about 612 nm. The OLEDs have a current efficiency of about 0.5 cd/A (at about 20 mA/cm2) and a maximum luminance between 150 and 200 cd/m2. The effects of various substituted imidazole moieties on the electrical properties of the on the OLEDs will be discussed. It is shown that the Eu complex with unsubstituted imidazole has electron mobility ∼10 -5 cm2 V-1 s-1, and should be a very useful material for fabricating red OLEDs with simple device structure.",

author = "Lam, {M. K.} and Kwok, {K. L.} and Tse, {S. C.} and So, {S. K.} and Yuan, {J. B.} and Leung, {Louis M.} and Gong, {M. L.}",

note = "Funding Information: Support of this research by the Research Committee of Hong Kong Baptist University under Grant # FRG/03-04/II-41, and the Research Grant Council of Hong Kong under Grant # HKBU/2173/04E are gratefully acknowledged.",

year = "2006",

month = may,

doi = "10.1016/j.optmat.2005.09.017",

language = "English",

volume = "28",

pages = "709--713",

journal = "Optical Materials",

issn = "0925-3467",

publisher = "Elsevier",

number = "6-7",

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TY - JOUR

T1 - Heterojunction OLEDs fabricated by Eu ternary complexes with conducting secondary ligands

AU - Lam, M. K.

AU - Kwok, K. L.

AU - Tse, S. C.

AU - So, S. K.

AU - Yuan, J. B.

AU - Leung, Louis M.

AU - Gong, M. L.

N1 - Funding Information: Support of this research by the Research Committee of Hong Kong Baptist University under Grant # FRG/03-04/II-41, and the Research Grant Council of Hong Kong under Grant # HKBU/2173/04E are gratefully acknowledged.

PY - 2006/5

Y1 - 2006/5

N2 - A series of Eu ternary complexes with charge conducting secondary ligands were examined as potential light-emitting materials for organic light-emitting diodes (OLEDs). The Eu complex contains an imidazole-based secondary ligand and is electron-conducting. Simple heterojunction OLEDs can be fabricated with a structure ITO/CuPc/TPD/Eu complex/cathode where ITO = indium-tin-oxide, CuPc = copper phthalocyanine, TPD = N,N-diphenyl-N,N′-bis(3-methylphenyl)(1, 1′-biphenyl)-4,4′-diamine. The Eu complex plays the dual role of electron-transporting and light-emitting layer. Sharp red emission can be observed at about 612 nm. The OLEDs have a current efficiency of about 0.5 cd/A (at about 20 mA/cm2) and a maximum luminance between 150 and 200 cd/m2. The effects of various substituted imidazole moieties on the electrical properties of the on the OLEDs will be discussed. It is shown that the Eu complex with unsubstituted imidazole has electron mobility ∼10 -5 cm2 V-1 s-1, and should be a very useful material for fabricating red OLEDs with simple device structure.

AB - A series of Eu ternary complexes with charge conducting secondary ligands were examined as potential light-emitting materials for organic light-emitting diodes (OLEDs). The Eu complex contains an imidazole-based secondary ligand and is electron-conducting. Simple heterojunction OLEDs can be fabricated with a structure ITO/CuPc/TPD/Eu complex/cathode where ITO = indium-tin-oxide, CuPc = copper phthalocyanine, TPD = N,N-diphenyl-N,N′-bis(3-methylphenyl)(1, 1′-biphenyl)-4,4′-diamine. The Eu complex plays the dual role of electron-transporting and light-emitting layer. Sharp red emission can be observed at about 612 nm. The OLEDs have a current efficiency of about 0.5 cd/A (at about 20 mA/cm2) and a maximum luminance between 150 and 200 cd/m2. The effects of various substituted imidazole moieties on the electrical properties of the on the OLEDs will be discussed. It is shown that the Eu complex with unsubstituted imidazole has electron mobility ∼10 -5 cm2 V-1 s-1, and should be a very useful material for fabricating red OLEDs with simple device structure.

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U2 - 10.1016/j.optmat.2005.09.017

DO - 10.1016/j.optmat.2005.09.017

M3 - Journal article

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SN - 0925-3467

VL - 28

SP - 709

EP - 713

JO - Optical Materials

JF - Optical Materials

IS - 6-7

ER -

Heterojunction OLEDs fabricated by Eu ternary complexes with conducting secondary ligands

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