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1.
A series of novel N-carbazole end-capped π-conjugated molecules were synthesized by a divergent approach with the use of bromination, Suzuki cross-coupling, and Ullmann reactions and their physical properties were investigated. In dilute solution, UV-vis absorption spectra displayed bathochromic shift with respect to their conjugated backbones, and photoluminescence spectra showed emission maxima in the blue region. Thermal analysis revealed that they are thermally stable semi-crystalline and amorphous materials. All molecules exhibited good electrochemical stability with high-lying HOMO energy levels and have potential applications as hole-transporting and light-emitting layers in organic light-emitting diodes or as host materials for electrophosphorescent applications. 相似文献
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Chokchai Kaiyasuan Pongsakorn Chasing Phattananawee Nalaoh Praweena Wongkaew Dr. Taweesak Sudyoadsuk Dr. Kanokwan Kongpatpanich Prof. Vinich Promarak 《化学:亚洲杂志》2021,16(16):2328-2337
Herein, two deep-blue emissive molecules ( SAF-PI and SAF-DPI ) are designed and synthesized using spiro[acridine-9,9’-fluorene] as a donor (D) substituted with 2-(3-methylphenyl)-1-phenyl-phenanthro[9,10-d]imidazole as an acceptor (A), forming twisted D−A and A−D−A structures, respectively. The photophysical studies and density functional theory (DFT) calculations reveal that both molecules exhibit hybridized local excited and charge transfer (HLCT) characteristics with deep blue emission color. They are effectively applied as non-doped emitters in OLEDs. Particularly, SAF-PI -based device achieves the high-definition television (HDTV) standard blue color emission peaked at 428 nm with CIE coordinate of (0.156, 0.053), a narrow full width at half maximum of 55 nm, a maximum external quantum efficiency (EQEmax) of 4.57% and an exciton utilization efficiency of 65%. 相似文献
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Jakkapan Kumsampao Chaiyon Chaiwai Pongsakorn Chasing Thanyarat Chawanpunyawat Supawadee Namuangruk Taweesak Sudyoadsuk Vinich Promarak 《化学:亚洲杂志》2020,15(19):3029-3036
Despite the success of thermally activated delayed fluorescent (TADF) materials in steering the next generation of organic light‐emitting diodes (OLEDs), effective near infrared (NIR) TADF emitters are still very rare. Here, we present a simple and extremely high electron‐deficient compound, 5,6‐dicyano[2,1,3]benzothiadiazole (CNBz), as a strong electron‐accepting unit to develop a sufficiently strong donor‐acceptor (D?A) interaction for NIR emission. End‐capping with the electron‐donating triphenylamine (TPA) unit created an effective D?A?D type system, giving rise to an efficient NIR TADF emissive molecule (λem=750 nm) with a very small ΔEST of 0.06 eV. The electroluminescent device using this NIR TADF emitter exhibited an excellent performance with a high maximum radiance of 10020 mW Sr?1 m?2, a maximum EQE of 6.57% and a peak wavelength of 712 nm. 相似文献
4.
A-Monrat ThaengthongSayant Saengsuwan Siriporn JungsuttiwongTinnagon Keawin Taweesak SudyoadsukVinich Promarak 《Tetrahedron letters》2011,52(37):4749-4752
Novel hole-transporting materials based on carbazole dendrimers, namely G1CBC and G2CBC were synthesized and characterized. They are thermally stable with high glass transition temperatures (Tg) up to 245 °C and exhibit chemically-stable redox processes. Double-layer green OLEDs using these materials as the hole-transporting layer (HTL) with the device configuration of ITO/HTL/Alq3/LiF:Al emit brightly (λem 522-534 nm) from the Alq3 layer with a maximum luminance and low turn-on voltage of 15,890 cd/m2 and 3.0 V, respectively. Their ability as HTLs in terms of device performance is comparable to the common hole-transporter N,N′-diphenyl-N,N′-bis(1-naphthyl)-(1,1′-biphenyl)-4,4′-diamine (NPB), however their thermal properties were far greater than both NPB and N,N′-bis(3-methylphenyl)-N,N′-bis(phenyl)benzidine (TPD). 相似文献
5.
Thangthong AM Meunmart D Prachumrak N Jungsuttiwong S Keawin T Sudyoadsuk T Promarak V 《Chemical communications (Cambridge, England)》2011,47(25):7122-7124
New highly fluorescent bifunctional anthracenes showed high thermal and electrochemical stability, and great potential as both blue emitters and hole-transporters for OLEDs. Deep-blue and Alq3-based green devices with maximum efficiencies and CIE coordinates of 1.65 and 6.25 cd A(-1), and (0.15, 0.16) and (0.26, 0.49) were achieved, respectively. 相似文献
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Janeeya KhunchaleeRuangchai Tarsaeng Siriporn JungsuttiwongTinnagon Keawin Taweesak SudyoadsukVinich Promarak 《Tetrahedron letters》2012,53(44):5939-5943
A series of new 7,7′bis(3,6-di-tert-butylcarbazol-N-yl)-substituted fluorenyl-oligothiophenes bearing 0-, 2-, 4-, 6-, and 8-thiophene rings, namely BCFTn, were synthesized using palladium catalyzed Stille dimerization coupling reactions of their corresponding brominated thiophenes. The relationship between the chemical structure and the properties of these oligomers was evaluated. With respect to the electronic properties, the longest wavelength absorptions, emissions, and also the oxidation potentials can be tuned by varying the conjugation length of the oligothiophene segments. The terminal carbazole and fluorene moieties of the resulting materials are beneficial for their morphology, conjugation length, and solubility. 相似文献
8.
A series of novel N-carbazole end-capped oligothiophene-fluorenes was synthesized using Ullmann coupling, bromination, and Suzuki coupling reactions. The optical, thermal, and electrochemical properties of these materials can be tuned by varying the conjugation length of the oligothiophene segment. The terminal carbazole and central fluorene moieties of the resulting materials are beneficial for their morphology, conjugation length, and solubility. 相似文献
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A-monrat Thangthong Duangratchaneekorn Meunmart Narid Prachumrak Siriporn Jungsuttiwong Tinnagon Keawin Taweesak Sudyoadsuk Vinich Promarak 《Tetrahedron》2012,68(7):1853-1861
New 9,10-substituted anthracene derivatives were designed and synthesized for application as blue-emitting and hole-transporting materials in electroluminescent devices. They were characterized by H NMR, C NMR, FTIR, UV–vis, PL spectroscopy, and mass spectrometry. The theoretical calculation of three-dimensional structure and the energy densities of HOMO and LUMO states, as well as optical properties of these new obtained materials, supported the claim that they had non-coplanar structures. Their optical, thermal, and electrochemical properties could be tuned by varying the peripheral substituents. All of them were electrochemically and thermally stable molecules. Materials having electron donating triphenylamine as peripheral substituents showed promising potential as both blue light-emitting materials and hole-transporting materials for electroluminescent devices. Efficient blue and Alq3-based green OLEDs with maximum luminance efficiencies and CIE coordinates of 1.65 cd/A and (0.15, 0.16) and 6.25 cd/A and (0.26, 0.49) were achieved, respectively. 相似文献