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Triphenylamine

About: Triphenylamine is a research topic. Over the lifetime, 4496 publications have been published within this topic receiving 100705 citations. The topic is also known as: N,N-Diphenylaniline & N,N-Diphenylbenzenamine.


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Journal ArticleDOI
TL;DR: In this paper, the authors employed starburst perfluorinated phenylenes (C60F42) as both hole and exciton block layer, and a hole-transport material 4,4′,4″-tri(N-carbazolyl) triphenylamine as a host for the phosphorescent dopant dye in the emitting layer.
Abstract: One of the keys to highly efficient phosphorescent emission in organic light-emitting devices is to confine triplet excitons generated within the emitting layer. We employ “starburst” perfluorinated phenylenes (C60F42) as a both hole- and exciton-block layer, and a hole-transport material 4,4′,4″-tri(N-carbazolyl) triphenylamine as a host for the phosphorescent dopant dye in the emitting layer. A maximum external quantum efficiency reaches to 19.2%, and keeps over 15% even at high current densities of 10–20 mA/cm2, providing several times the brightness of fluorescent tubes for lighting. The onset voltage of the electroluminescence is as low as 2.4 V and the peak power efficiency is 70–72 lm/W, promising for low-power display devices.

911 citations

Journal ArticleDOI
TL;DR: Star-shaped molecules based on a triphenylamine core derivatized with various combinations of thienylenevinylene conjugated branches and electron-withdrawing indanedione or dicyanovinyl groups have been synthesized, showing that the introduction of the electron-acceptor groups induces an intramolecular charge transfer that results in a shift of the absorption onset toward longer wavelengths and a quenching of photoluminescence.
Abstract: Star-shaped molecules based on a triphenylamine core derivatized with various combinations of thienylenevinylene conjugated branches and electron-withdrawing indanedione or dicyanovinyl groups have been synthesized. UV−vis absorption and fluorescence emission data show that the introduction of the electron-acceptor groups induces an intramolecular charge transfer that results in a shift of the absorption onset toward longer wavelengths and a quenching of photoluminescence. Cyclic voltammetry shows that all compounds present a reversible first oxidation process whose potential increases with the number of electron-withdrawing groups in the structure. Prototype bulk and bilayer heterojunction solar cells have been realized using fullerene C60 derivatives as acceptor material. The results obtained with both kinds of devices show that the introduction of electron-acceptor groups in the donor structure induces an extension of the photoresponse in the visible spectral region, an increase of the maximum external...

760 citations

Journal ArticleDOI
TL;DR: Results show that energetic tuning of the chromophores was successful and fulfilled the thermodynamic criteria for dye-sensitized solar cells, electrical losses depending on the size and orientation of the Chromophores were observed.
Abstract: A series of organic chromophores have been synthesized in order to approach optimal energy level composition in the TiO2−dye−iodide/triiodide system in the dye-sensitized solar cells. HOMO and LUMO energy level tuning is achieved by varying the conjugation between the triphenylamine donor and the cyanoacetic acid acceptor. This is supported by spectral and electrochemical experiments and TDDFT calculations. These results show that energetic tuning of the chromophores was successful and fulfilled the thermodynamic criteria for dye-sensitized solar cells, electrical losses depending on the size and orientation of the chromophores were observed.

572 citations

Journal ArticleDOI
TL;DR: In this article, a series of starburst triarylamine fluorophores SBCHO, DBCHO and CZCHO were investigated as non-doped host emitters and hole transporters.
Abstract: A new series of starburst triarylamine fluorophores SBCHO, DBCHO, CZCHO, CZCN, and SBCN, that incorporate diphenylamine or carbazole as the electron donor and dicyanovinyl or aldehyde as the electron acceptor, has been prepared and their photophysical properties are investigated. In sharp contrast to most red-emitting dopants, which show serious aggregation-caused quench phenomena, the new starburst triphenylamine derivatives reported here show unique enhanced emission in the solid state or upon aggregation. Organic light emitting diodes using these compounds as non-doped host emitters and hole transporters have been fabricated. The highest external quantum yield reaches 2.09 % for CZCHO. SBCHO was investigated as a chlorine gas fluorescence (FL) solid-film sensor for the first time. The high-intensity emission was ‘turned off' immediately after being blown by Cl2 gas.

512 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023214
2022403
2021255
2020261
2019296
2018307