- Fully conjugated graft copolymers comprising a P-type donor-acceptor backbone and poly(3-hexylthiophene) side chains synthesized via a graft through approach
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A series of fully conjugated graft copolymers containing poly(3-hexylthiophene) (P3HT) side chains and a p-type carbazole- diketopyrrolopyrrole (CbzDPP) donor-acceptor backbone were synthesized via a graft through Suzuki polymerization. The macromonomers were formed by externally initiating P3HT growth from a boronic ester-functionalized carbazole via Kumada catalyst transfer polycondensation. Subsequently, this macromonomer was copolymerized with a DPP monomer via a graft through Suzuki polymerization to yield the final graft copolymers. The graft copolymers exhibit optical and electronic properties of both P3HT and the CbzDPP polymers independently due to the break in conjugation between the carbazole unit and P3HT chain. Moreover, these properties reflect the relative proportion of P3HT and CbzDPP polymers; shorter P3HT chain lengths lead to graft copolymers that possess more CbzDPP character and vice versa. The macromonomers were characterized by gel permeation chromatography, mass spectrometry, and UV-visible spectroscopy. The graft copolymers were further investigated using gel permeation chromatography, UV-visible spectroscopy, cyclic voltammetry, differential scanning calorimetry, and atomic force microscopy. Finally, organic field effect transistors were fabricated using the graft copolymers and compared to an analogous linear CbzDPP copolymer. Ultimately, the graft copolymers with the longest P3HT chains (ca. 75 repeat units) exhibited almost exclusively P3HT characteristics, possessing a small CbzDPP internal charge transfer (ICT) peak and only p-type conductivity (μh ~ 6 × 10-4 cm2 V-1 s-1). Conversely, the graft copolymers with the shortest P3HT chains (ca. 10 repeat units) showed significant CbzDPP character, including a strong ICT peak and ambipolar mobilities (μh ~ 5 × 10 -3 cm2 V-1 s-1; μe ~ 7 × 10-4 cm2 V-1 s-1).
- Zeigler, David F.,Mazzio, Katherine A.,Luscombe, Christine K.
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- Low-Temperature Cross-Linkable Small Molecules for Fully Solution-Processed OLEDs
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Cross-linkable hole-transporting, host, and electron-transporting materials with a new cross-linking group, uracil, are designed and synthesized. These compounds exhibited good solubility in common organic solvents and excellent solvent resistance after cross-linking at a low temperature of 120 °C. The OLED was fabricated by all-solution processing using cross-linkable synthetic compounds, except for the electrodes. This device exhibited a current efficiency of 39.2 cd A?1 and a power efficiency of 15.3 lm W?1.
- Lee, Sungkoo,Seo, Min Hye
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- Materials for electronic devices
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The invention relates to compounds with benzindenofluorene base bodies and to the use thereof in electronic devices, in particular in organic electroluminescent devices.
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Paragraph 0213; 0214; 0215; 0216
(2016/10/08)
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- DITRIPHENYLENE DERIVATIVE AND ORGANIC ELECTROLUMINESCENT DEVICE USING THE SAME
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The present invention discloses a novel ditriphenylene derivative is represented by the following formula(I), the organic EL device employing the ditriphenylene derivative as host material or dopant material of emitting layer can lower driving voltage, pr
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- Ditriphenylene derivative and organic electroluminescent device using the same
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The present invention discloses a novel ditriphenylene derivative is represented by the following formula (I), the organic EL device employing the ditriphenylene derivative as host material or dopant material of emitting layer can lower driving voltage, p
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