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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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Daungratchaneekron MeunmartNarid Prachumrak Tinnagon KeawinSiriporn Jungsuttiwong Taweesak SudyoadsukVinich Promark 《Tetrahedron letters》2012,53(28):3615-3618
A new highly fluorescent bis(4-diphenylaminophenyl)carbazole end-capped fluorene (TCF) is synthesized and characterized. TCF is an amorphous molecular glass with a high glass transition temperature of 169 °C, is electrochemically stable, and gives strong blue emission both in solution and solid state. It showed greater ability as a solution processed blue emitter and hole-transporter for OLEDs than commonly used NPB. High-efficiency, deep-blue and Alq3-based green devices with luminance efficiencies and CIE coordinates of 0.93 cd/A and (0.16, 0.09), and 3.78 cd/A and (0.29, 0.45) were achieved, respectively. 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
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Moonsin P Prachumrak N Rattanawan R Keawin T Jungsuttiwong S Sudyoadsuk T Promarak V 《Chemical communications (Cambridge, England)》2012,48(28):3382-3384
Carbazole dendrimers up to 4th generation were synthesized. They showed significantly high T(g), amorphous and stable electrochemical properties, and great potential as solution processed hole-transporting materials for OLEDs. Alq3-based green devices exhibited high luminance efficiency and CIE coordinates of 4.45 cd A(-1) and (0.29, 0.53), respectively. 相似文献
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Coumarin-cored carbazole dendrimers as solution-processed non-doped green emitters for electroluminescent devices 总被引:1,自引:0,他引:1
Narid Prachumrak Sirintra Potjanasopa Rattanawalee Rattanawan Supawadee Namuangruk Siriporn Jungsuttiwong Tinnagon Keawin Taweesak Sudyoadsuk Vinich Promarak 《Tetrahedron》2014
A series of green-emitting thiophenyl coumarin-cored carbazole dendrimers containing carbazole dendrons up to the third generation as substituent were synthesized and characterization. Their optical, thermal, electrochemical, and electroluminescent properties as non-doped solution-processed light-emitters for OLEDs were investigated. By incorporating carbazole dendrons in the molecule, we are able to reduce the crystallization and retain the high emissive ability of a planar thiophenyl coumarin fluorescent core in the solid state as well as improve the thermal stability of the material. These dendrimers showed a bright-green fluorescence and can form morphologically stable amorphous thin films with glass-transition temperatures as high as 285 °C. Simple structured solution-processed OLEDs using these materials as hole-transporting non-doped emitters and BCP as a buffer layer emit a stable green electroluminescence (λEL=502–526 nm) with high luminance efficiencies (up to 7.92 cd/A at 7.39 mA/cm2) and high green color purity (CIE=0.26, 0.62, which are close to the pure green color). 相似文献
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Palita Kochapradist Thitiya Sunonnam Narid Prachumrak Supawadee Namuangruk Tinnagon Keawin Siriporn Jungsuttiwong Taweesak Sudyoadsuk Vinich Promarak 《Tetrahedron letters》2014
A series of novel N-coumarin derivatives containing oligothiophene-substituted N-coumarins as the core and bis(aryl)carbazoles as the substituent were synthesized and characterized. Their optical, electrochemical, and thermal properties were investigated. The electroluminescence (EL) properties of the selected materials were also studied. Solution-processed OLEDs with green and yellow light emission, turn-on voltages of 2.7–2.9 V, and maximum luminance efficiencies of up to 3.94 cd A−1 at 17.6 mA cm−2 (maximum power efficiency of 1.62 lm W−1) were prepared. 相似文献
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Tanika Khanasa Narid Prachumrak Palita Kochapradist Supawadee Namuangruk Tinnagon Keawin Siriporn Jungsuttiwong Taweesak Sudyoadsuk Vinich Promarak 《Tetrahedron letters》2014
New D-π-A-π-A type organic dyes were synthesized and characterized as sensitizers for dye-sensitized solar cells (DSSCs). These dyes showed wide absorption spectra (300–625 nm) and high molar extinction coefficients (ε467 nm = 60,911 M−1 cm−1). As dye sensitizers in DSSC, the D-π-A-π-A dye having a cyanoacrylic acid as an acceptor gave the best cell performance with a short-circuit photocurrent density (Jsc) of 7.14 mA/cm2, an open-circuit voltage (Voc) of 0.62 V, and a fill factor (FF) of 0.72, corresponding to an overall conversion efficiency η of 3.19%. 相似文献
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Janeeya Khunchalee Ruangchai Tarsang Narid Prachumrak Siriporn Jungsuttiwong Tinnagon Keawin Taweesak Sudyoadsuk Vinich Promarak 《Tetrahedron》2012,68(40):8416-8423
A series of oligofluorene-thiophenes end-capped with 3,6-di-tert-butylcarbazole and pyrene were designed and synthesized for application as color tunable emissive materials for organic electroluminescent devices. They were characterized by 1H NMR, 13C NMR, FT-IR, UV–vis, PL spectroscopy, and mass spectrometry. Theoretical calculations revealed that the carbazole moiety attached to the end of the molecule is nearly perpendicular to oligofluorene-thiophene-pyrene plane and π-electrons in the ground state delocalize over the entire molecule. Their optical, thermal, and electrochemical properties could be tuned by varying the number of thiophene units in the molecule. All were electrochemically and thermally stable molecules. OLED devices of these materials emitted brightly in various colors from deep blue to orange. Particularly, deep blue (CIE coordinates of 0.16, 0.14) and green (CIE coordinates of 0.27, 0.61) devices showed high color quality close to the NTSC standards with high luminance efficiencies of 1.14 and 11.15 cd/A, respectively. 相似文献
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Sukrawee PansayNarid Prachumrak Siriporn JungsuttiwongTinnagon Keawin Taweesak SudyoadsukVinich Promarak 《Tetrahedron letters》2012,53(34):4568-4572
We present an efficient method for the selective bromination of N-alkylcarbazoles using N-bromosuccinimide (NBS) in THF. Four brominated N-alkylcarbazoles including 3-bromo-, 3,6-dibromo-, 1,3,6-tribromo- and 1,3,6,8-tetrabromo-carbazoles were prepared and identified by 1H NMR spectroscopy. Subsequent cross-coupling of these carbazoles with benzo[b]thien-2-ylboronic acid gave the corresponding benzo[b]thien-2-yl functionalized carbazoles in good yields. 相似文献
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