Organic electroluminescent devices using europium complex as an electron-transport emitting layer

Liang, Chunjun; Hong, Ziruo; Liu, Xingyuan; Zhao, Dongxu; Li, W.L; Peng, Junbiao; Yu, Jian; Lee, C.S; Lee, S.T

doi:10.1016/s0040-6090(99)00713-0

Cited by 37 publications

(52 citation statements)

References 15 publications

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“…Eu complexes are excellent red phosphors that exhibit intense emission at~610 nm with a sharp spectral bandwidth. (Eu(ligands) 3 ) such as Eu(TTA) 3 is also an excellent red phosphors, but they can't be deposited by vacuum deposition technique. (Eu(ligand) 3 ) is non-volatile because it does not have the structure of an inner complex salt.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel europium β‐diketonate organic complexes for solid‐state lighting

Kalyani¹,

Dhoble

Pode

2012

Luminescence

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Volatile Eu complexes, namely Eu(TTA)3Phen, Eu(x)Y(1-x)(TTA)3Phen; Eu(x)Tb(1-x)(TTA)3Phen; Eu, europium; Y, yttrium; Tb, Terbium; TTA, thenoyltrifluoroacetone; and Phen, 1,10 phenanthroline were synthesized by maintaining stichiometric ratio. Various characterization techniques such as X-ray diffraction (XRD), photoluminescence (PL) and thermo gravimetric analysis/differential thermal analysis (TGA/DTA) were carried out for the synthesized complexes. Diffractograms of all the synthesized complexes showed well-resolved peaks, which revealed that pure and doped organic Eu(3+) complexes were crystalline in nature. Of all the synthesized complexes, Eu0.5Tb0.5(TTA)3Phen showed maximum peak intensity, while the angle of maximum peak intensity for all complexes was almost the same with slightly different d-values. A prominent sharp red emission line was observed at 611 nm when excited with light at 370 nm. It was observed that the intensity of red emissions increased for doped europium complexes Eu(x)Y(1-x)(TTA)3Phen and Eu(x)Tb(1-x)(TTA)3Phen, when compared with Eu complexes. Emission intensity increased in the following order: Eu(TTA)3Phen > Eu0.5Tb0.5(TTA)3Phen > Eu0.4Tb0.6(TTA)3Phen > Eu0.5Y0.5(TTA)3Phen > Eu0.4Y0.6(TTA)3Phen, proving their potential application in organic light-emitting diodes (OLEDs). TGA showed that Eu complexes doped in Y(3+) and Tb(3+) have better thermal stability than pure Eu complex. DTA analysis showed that the melting temperature of Eu(TTA)3Phen was lower than doped Eu complexes. These measurements infer that all complexes were highly stable and could be used as emissive materials for the fabrication of OLEDs.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of novel europium β‐diketonate organic complexes for solid‐state lighting

Kalyani¹,

Dhoble

Pode

2012

Luminescence

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“…Holes injected into the RE complex film were found to be quenchers of luminescence and sources leading to poor stability. [15] N,N¢-Diphenyl-N,N¢bis(3-methylphenyl)-1,1¢-diphenyl-4,4¢-diamine (TPD) was selected as the hole-transporting material (HTM). An external quantum efficiency of 4.6 %, was obtained at low current density for our optimized EL device, which is higher than 1/4 of its PL efficiency and thus is experimental evidence for the contribution of triplet states.…”

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confidence: 99%

Rare Earth Complex as a High-Efficiency Emitter in an Electroluminescent Device

et al. 2001

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“…We think there must be some kind of energy transfer between PVK and europium complex. However, the overlap of the PVK emission spectrum and the excitation spectrum of europium complex are very little [8]. So different from terbium complex of same ligand [9], the occurrence possibility of Forster energy transfer process from PVK to Eu(BSA) 3 phen is also very little.…”

Section: Resultsmentioning

confidence: 99%

The photoluminescent and electroluminescent properties of a new Europium complex

Guo

Deng

Liang

et al. 2007

Journal of Luminescence

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Organic electroluminescent devices using europium complex as an electron-transport emitting layer

Cited by 37 publications

References 15 publications

Synthesis and characterization of novel europium β‐diketonate organic complexes for solid‐state lighting

Synthesis and characterization of novel europium β‐diketonate organic complexes for solid‐state lighting

Rare Earth Complex as a High-Efficiency Emitter in an Electroluminescent Device

The photoluminescent and electroluminescent properties of a new Europium complex

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