3,6-Di(9-carbazolyl)-9-(2-ethylhexyl)carbazole based single-layer blue organic light emitting diodes

Cherpak, Vladyslav; Stakhira, Pavlo; Volynyuk, D.; Simokaitienė, Jūratė; Tomkevičienė, Aušra; Gražulevičius, Juozas V.; Bučinskas, Audrius; Yashchuk, Valeriy M.; Кухто, А. В.; Kukhta, I. N.; Kosach, V.; Hotra, Zenon

doi:10.1016/j.synthmet.2011.04.035

Cited by 22 publications

(14 citation statements)

References 16 publications

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“…Taking into account the shape and position of the high-energy band, one can presume that this emission is related to recombination of singlet excitons on the TCz1 host which also is an efficient fluorescent emitter. 62 Higher relative intensity of the high-energy band was observed in EL spectra of the devices of series II having structure ITO/MoO 3 /CX/TCz1:FIrpic/ TCz1/TPBi/Ca:Al in which the nondoped TCz1 layer was additionally used as the exciton-blocking layer (Figures 5a and S5a). Due to the exciton recombination on the fluorescence emitter (TCz1), the output characteristics of the devices of series II were found to be worse than those of the devices of series I (Table 3, Figure S4b−e).…”

Section: Resultsmentioning

confidence: 95%

Sensitivity of Redox and Optical Properties of Electroactive Carbazole Derivatives to the Molecular Architecture and Methoxy Substitutions

et al. 2018

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In the domain of organic light-emitting diode (OLED) applications, organic electroactive materials play a crucial role. In order to allow for more flexibility in their properties, methoxy or other substituents are frequently used. However, undesirable modifications in their polarity may be additionally obtained, which is particularly important in the case of TADF-based OLEDs. In order to dissociate as much as possible intramolecular and bulk effects, we synthesized two series of methoxy-substituted carbazole−bridge−carbazole (bridge = carbazolyl, phenyl) compounds and characterized them by means of experimental and theoretical methods. Vshape (3,6) substitutions on the carbazole bridge and linear (para-phenyl) bisubstitutions were used in the new compounds. By varying the number of methoxy groups from 0 to 4 per carbazole unit, we analyze the effect of the number and the linking topology of the methoxy substitutions on the thermal, electronic, and optical properties of the molecules. The results indicate that the variations of the redox and fluorescence properties upon methoxy substitutions depend importantly on the linear-versus V-shape D−A−D molecular architecture, due to the absence and presence, respectively, of the dipolar moments and of the bulk polarity. The choice of the molecular architecture and methoxy substitutions can be used consequently to switch on/off the molecular polarity and to tune the sensitivity of redox and optical properties of electroactive materials with respect to medium electrostatic effects. These compounds were additionally utilized in blue phosphorescence organic light-emitting devices and showed good hole-transporting, exciton-blocking, and electron-blocking properties.

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Section: Resultsmentioning

confidence: 95%

Sensitivity of Redox and Optical Properties of Electroactive Carbazole Derivatives to the Molecular Architecture and Methoxy Substitutions

et al. 2018

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“…10,11 In these applications the host material ideally suppresses quenching and triplet-triplet annihilation of the metal complex while possessing good thermal stability, high charge transport mobility and tuned triplet energies that match the corresponding emission profile for the desired OLED. [12][13][14][15][16] One of the most widely used host materials 4,4′-bis(9-carbazolyl) biphenyl (CBP) possesses a triplet energy of (2.56 eV) making CBP an ideal candidate for both red and green OLEDs. 17 The structure of one polymorph of CBP (Cambridge Structural Database refcode: KANYUU) has been published previously.…”

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confidence: 99%

Polymorphism and the influence of crystal structure on the luminescence of the opto-electronic material 4,4′-bis(9-carbazolyl)biphenyl

et al. 2014

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“…The absorption spectrum has two maxima at 342 and 366 nm as a result of the superposition of absorption by TCz1 and HPhP. These maxima correspond to the vibronic bands of the first electron transition (S 0 -S 1 ) of single carbazole moiety [21,27] and pyrazoline ring [15,28]. Photoluminescence spectrum of the structure HPhP/TCz1 (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…3,6-Di(9-carbazolyl)-9-(2ethylhexyl)carbazole (TCz1) served as the electron-transporting layer. The choice of this material was based on its relatively high electron mobility (2 × 10 −4 cm 2 /V s) [16] exceeding by one order of magnitude the value of hole mobility, high thermal stability [16,21], and good energetical compatibility with Ca electrode (Fig. 2) [22].…”

Section: Methodsmentioning

confidence: 99%

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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3,6-Di(9-carbazolyl)-9-(2-ethylhexyl)carbazole based single-layer blue organic light emitting diodes

Cited by 22 publications

References 16 publications

Sensitivity of Redox and Optical Properties of Electroactive Carbazole Derivatives to the Molecular Architecture and Methoxy Substitutions

Sensitivity of Redox and Optical Properties of Electroactive Carbazole Derivatives to the Molecular Architecture and Methoxy Substitutions

Polymorphism and the influence of crystal structure on the luminescence of the opto-electronic material 4,4′-bis(9-carbazolyl)biphenyl

Blue organic light-emitting diodes based on pyrazoline phenyl derivative

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