Carbazolylphosphines and carbazolylphosphine oxides: facilely synthesized host materials with tunable mobilities and high triplet energy levels for blue phosphorescent OLEDs

Zhao, Zifeng; Yu, Gang; Chang, Qiao-Wen; Liu, Xiaochen; Liu, Yang; Wang, Liding; Liu, Zhiwei; Bian, Zuqiang; Liu, Weiping; Huang, Chunhui

doi:10.1039/c7tc01594a

Cited by 41 publications

(19 citation statements)

References 36 publications

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“…No shift in the absorption maxima concerning P O, P S, and P Se units indicated that the electronic communication between the phenothiazine and P = X unit is negligible in the ground state. This observation parallels the UV-Vis spectra of tris-carbazole phosphoramides reported by Huang et al 95,98 The absorption process in TPTZPO, TPTZPS, and TPTZPSe is insensitive to the solvent polarity indicating the nonpolar electronic ground state in these compounds.…”

Section: Resultssupporting

confidence: 89%

Crystallization induced room-temperature phosphorescence and chiral photoluminescence properties of phosphoramides

et al. 2022

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Section: Resultssupporting

confidence: 89%

Crystallization induced room-temperature phosphorescence and chiral photoluminescence properties of phosphoramides

et al. 2022

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“…[ 61 ] As known, the overall PCE ( η ) is one of the most quantitative parameters that describe the DSSC performance, which is directly related to the open‐circuit voltage, V oc ; short‐circuit current density, J sc ; and FF . It can be expressed as follows [ 63,64 ] :

PCE ((), η) = \frac{P_{\max}}{P_{in}} = \frac{V_{oc} J_{sc}}{P_{in}} italicFF

where P max is the maximum power of the DSSC devices, and P in (=100 mW cm −2 ) is the incident solar power on the cell. The ν oc , FF , J sc , and PCE values for all studied dyes are summarized in Table 9.…”

Section: Resultsmentioning

confidence: 99%

Improved photovoltaic performance of phosphonic acid‐based sensitized solar cells via an electron‐withdrawing moiety: A density of functional theory study

Fadili

Fahim

Bouzzine

et al. 2020

Int J of Quantum Chemistry

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In this study, the photovoltaic properties and the effects of modifying phosphonic acid-based dye-sensitized solar cell (DSSC) via an electron-withdrawing moiety were theoretically investigated using density functional theory methodology. According to the results, the inclusion of the C C and the electron-withdrawing CN moieties exhibits a decrease in the highest occupied molecular orbital (HOMO)-lowest unoccupied molecular orbital (LUMO) gap and a redshift in the absorption spectra. The photoelectric conversion efficiency (PCE) for the T4BTD-A dye was estimated to be about 6.57% under the standard AM 1.5G solar radiation, which is in excellent agreement with its measured value of 6.40%, suggesting that the calculation scheme is consistent. In addition, the predicted PCE value after elongation of T4BTD-A by C C and cyanure (CN) has increased to 7.11% and (7.82%, 8.09%), respectively. The addition of CN electron-withdrawing moiety also enhances the PCE of the studied dyes, while the position of CN moiety has a slight effect on the PCE of the studied dyes. Finally, the calculation suggests that the CCCN1 and CCCN2 are good candidates as efficient sensitizers for DSSC applications.

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“…Aryl phosphine oxide (APO, Scheme 1 ), with moderated electron-withdrawing ability and excellent charge transport properties, has been widely applied in blue bipolar hosts [ 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Through simply replacing the O atom of APO with the S atom, aryl phosphine sulfide (APS, Scheme 1 ) can be gained.…”

Section: Introductionmentioning

confidence: 99%

Phosphine Sulfide-Based Bipolar Host Materials for Blue Phosphorescent Organic Light-Emitting Diodes

et al. 2021

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Three phosphine sulfide-based bipolar host materials, viz CzPhPS, DCzPhPS, and TCzPhPS, were facilely prepared through a one-pot synthesis in excellent yields. The developed hosts exhibit superior thermal stabilities with the decomposition temperatures (Td) all exceeding 350 °C and the melting temperatures (Tm) over 200 °C. In addition, their triplet energy (ET) levels are estimated to be higher than 3.0 eV, illustrating that they are applicable to serve as hosts for blue phosphorescent organic light-emitting diodes (PhOLEDs). The maxima luminance, current efficiency (CE), power efficiency (PE), and external quantum efficiency (EQE) of 17223 cd m−2, 36.7 cd A−1, 37.5 lm W−1, and 17.5% are achieved for the blue PhOLEDs hosted by CzPhPS. The PhOLEDs based on DCzPhPS and TCzPhPS show inferior device performance than that of CzPhPS, which might be ascribed to the deteriorated charge transporting balance as the increased number of the constructed carbazole units in DCzPhPS and TCzPhPS molecules would enhance the hole-transporting ability of the devices to a large extent. Our study demonstrates that the bipolar hosts derived from phosphine sulfide have enormous potential applications in blue PhOLEDs, and the quantity of donors should be well controlled to exploit highly efficient phosphine sulfide-based hosts.

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Carbazolylphosphines and carbazolylphosphine oxides: facilely synthesized host materials with tunable mobilities and high triplet energy levels for blue phosphorescent OLEDs

Abstract: Selectively modulating the charge mobility of host materials by the oxidation of phosphines for highly efficient blue phosphorescent OLEDs.

Cited by 41 publications

References 36 publications

Crystallization induced room-temperature phosphorescence and chiral photoluminescence properties of phosphoramides

Crystallization induced room-temperature phosphorescence and chiral photoluminescence properties of phosphoramides

Improved photovoltaic performance of phosphonic acid‐based sensitized solar cells via an electron‐withdrawing moiety: A density of functional theory study

Phosphine Sulfide-Based Bipolar Host Materials for Blue Phosphorescent Organic Light-Emitting Diodes

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