1429922-06-4Relevant academic research and scientific papers
An efficient solution processed non-doped red emitter based on carbazole-triphenylamine end-capped di(thiophen-2-yl)benzothiadiazole for pure red organic light-emitting diodes
Khanasa, Tanika,Prachumrak, Narid,Rattanawan, Rattanawalee,Jungsuttiwong, Siriporn,Keawin, Tinnagon,Sudyoadsuk, Taweesak,Tuntulani, Thawatchai,Promarak, Vinich
supporting information, p. 3401 - 3403 (2013/06/04)
New carbazole-triphenylamine end-capped di(thiophen-2-yl)benzothiadiazole showed high thermal and electrochemical stability, and great potential as a solution processed hole-transporting non-doped red emitter for OLEDs. A pure red device with CIE coordinates and a high luminance efficiency of (0.66, 0.33) and 3.97 cd A-1, respectively, was achieved.
Bis(carbazol-9-ylphenyl)aniline end-capped oligoarylenes as solution-processed nondoped emitters for full-emission color tuning organic light-emitting diodes
Khanasa, Tanika,Prachumrak, Narid,Rattanawan, Rattanawaree,Jungsuttiwong, Siriporn,Keawin, Tinnagon,Sudyoadsuk, Taweesak,Tuntulani, Thawatchai,Promarak, Vinich
, p. 6702 - 6713 (2013/07/26)
A series of bis(3,6-di-tert-butylcarbazol-9-ylphenyl)aniline end-capped oligoarylenes, BCPA-Ars, are synthesized by double palladium-catalyzed cross-coupling reactions. By using this bis(carbazol-9-yl)triphenylamine moiety as an end-cap, we are able to reduce the crystallization and retain the high-emission ability of these planar fluorescent oligoarylene cores in the solid state, as well as improve the amorphous stability and solubility of the materials. The results of optical and electrochemical studies show that their HOMOs, LUMOs, and energy gaps can be easily modified or fine-tuned by either varying the degree of π-conjugation or using electron affinities of the aryl cores which include fluorene, oligothiophenes, 2,1,3-benzothiadiazole, 4,7-diphenyl-4-yl-2,1,3-benzothiadiazole, and 4,7-dithien-2-yl-2,1,3- benzothiadiazole. As a result, their emission spectra measured in solution and thin films can cover the full UV-vis spectrum (426-644 nm). Remarkably, solution-processed nondoped BCPA-Ars-based OLEDs could show moderate to excellent device performance with emission colors spanning the whole visible spectrum (deep blue to red). Particularly, the RGB (red, green, blue) OLEDs exhibit good color purity close to the pure RGB colors. This report offers a practical approach for both decorating the highly efficient but planar fluorophores and tuning their emission colors to be suitable for applications in nondoped and solution-processable full-color emission OLEDs.
Synthesis and characterization of 2D-D-π-A-type organic dyes bearing bis(3,6-di-tert-butylcarbazol-9-ylphenyl)aniline as donor moiety for dye-sensitized solar cells
Khanasa, Tanika,Jantasing, Nittaya,Morada, Somphob,Leesakul, Nararak,Tarsang, Ruangchai,Namuangruk, Supawadee,Kaewin, Tinnagon,Jungsuttiwong, Siriporn,Sudyoadsuk, Taweesak,Promarak, Vinich
, p. 2608 - 2620 (2013/06/27)
A series of novel 2D-D-π-A-type organic dyes, namely CCTTnA (n = 1-3), bearing bis(3,6-di-tert-butylcarbazol-9-ylphenyl)aniline as an electron-donor moiety (2D-D), oligothiophene segments with a number of thiophene units from one to three units as π-conjugated spacers (π), and cyanoacrylic acid as the electron acceptor (A) were synthesized and characterized as dye sensitizers for dye-sensitized solar cells (DSSCs). These compounds exhibit high thermal and electrochemical stability. Detailed investigations of these dyes reveal that both peripheral carbazole donors (2D) have beneficial influence on the red-shifted absorption spectrum of the dye in solution and dye adsorbed on TiO2 film, and the broadening of the incident monochromatic photon-to-current conversion efficiency (IPCE) spectra of the DSSCs, leading to enhanced energy conversion efficiency (η). Among these dyes, CCTT3A shows the best photovoltaic performance, and a maximal incident monochromatic photon-to-current conversion efficiency (IPCE) value of 80 %, a short-circuit photocurrent density (Jsc) of 9.98 mA cm-2, open-circuit voltage (Voc) of 0.70 V, and fill factor (FF) of 0.67, corresponding to an overall conversion efficiency η of 4.6 % were achieved. This work suggests that organic dyes based on this type of donor moiety or donor molecular architecture are promising candidates for improved performance DSSCs. New 2D-D-π-A-type organic dyes incorporating bis(3,6-di-tert-butylcarbazol-9- ylphenyl)aniline as an electron-donor moiety show great potential as sensitizers for dye-sensitized solar cells. Copyright
