Properties of 2,6-di-tert.-butyl-4-(2,5-diphenyl-3,4-dihydro-2H-pyrazol-3-yl)-phenol as hole-transport material for life extension of organic light emitting diodes

Cherpak, Vladyslav; Stakhira, Pavlo; Khomyak, S. V.; Volynyuk, D.; Hotra, Zenon; Voznyak, Lesya; Довбешко, Г. И.; Fesenko, Olena; Сорокин, В. М.; Rybalochka, A.; Oliynyk, O.

doi:10.1016/j.optmat.2011.05.034

Cited by 23 publications

(18 citation statements)

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“…A nonplanar molecular structure essentially prevents crystallization and thus decreases degradation of electroluminescent structure [14,15]. It was also reported [15] that the use of 2,6-di-tert.-butyl-4-(2,5-diphenyl-3,4-dihydro-2Hpyrazol-3-yl)-phenol (HPhP) ( Fig. 1 (left)) as a hole-transporting layer results in the suppression of degradation processes in OLED under atmospheric factors.…”

Section: Introductionmentioning

confidence: 93%

“…1,3,5-Triphenyl-4,5-dihydro-1H-pyrazol with phenyl group in position 5 of pyrazoline ring was found to form stable amorphous films by vacuum deposition [13]. A nonplanar molecular structure essentially prevents crystallization and thus decreases degradation of electroluminescent structure [14,15]. It was also reported [15] that the use of 2,6-di-tert.-butyl-4-(2,5-diphenyl-3,4-dihydro-2Hpyrazol-3-yl)-phenol (HPhP) ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Blue organic light-emitting diodes based on pyrazoline phenyl derivative

Stakhira¹,

Khomyak²,

Cherpak³

et al. 2012

Synthetic Metals

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The results of an experimental study of the electroluminescent device made of ITO/CuI/2,6-di-tert.-butyl-4-(2,5-diphenyl-3,4-dihydro-2H-pyrazol-3-yl)- phenol (HPhP)/3,6-Di(9-carbazolyl)-9-(2-ethylhexyl) carbazole (TCz1)/Ca:Al with efficacy up to 10.63 cd/A are presented. HPhP provides blue emission with a peak wavelength at 445 nm. The layer of TCz1 acts as an electron-transporting layer. In the framework of density functional theory (DFT) approach the geometry configuration and energy levels of HPhP are found being in a good agreement with spectral and cyclic voltammogram data. © 2011 Elsevier B.V

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Blue organic light-emitting diodes based on pyrazoline phenyl derivative

Stakhira¹,

Khomyak²,

Cherpak³

et al. 2012

Synthetic Metals

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“…Dyes: fluorescent dye fluorescein (Aldrich) (λ ex = 494 nm, λ em = 521 nm); fluorescent dye 2,6-di-tertbutyl-4-(2,5-diphenyl-3,4-dihydro-2H-pirazole-3-yne)-phenol (pyrazoline)* 2 ( λ ex = 366 nm, λ em = 445 nm) (synthesized according to the method described in [74]). …”

Section: Reagents and Materialsmentioning

confidence: 99%

Target Synthesis of Functional Biocompatible Nanocomposites with “Core-Shell” Structure

Zaichenko¹,

Mitina²,

Miagkota³

et al. 2018

ChChT

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Abstract.1 Metal-complex macroinitiators were successfully applied for the synthesis of polymer nanocomposites with core-shell structure by two-stage water dispersed polymerization. On the first stage, formation of monodispersed polymer particles of desired size and functionality is achieved by target variation of macroinitiator concentration, content of metal cations in its structure, and pH of medium. Initiation of grafted polymerization from the surface of seeded particles is provided by residual peroxide moieties of macroinitiator.

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“…8d). The reason behind low turn-on voltage of material I attributed to the fact that thiophene substituted pyrazoline is near the conducting level when compared to furan and pyridine substitution [46,47]. Thus the material I exhibits good semiconducting nature than II and III.…”

Section: I-v Characterizationmentioning

confidence: 99%