- Synthesis and investigation of triphenylamine-based double branched organic dyes for p-type dye-sensitized solar cells
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Two double branched organic dyes (T1I and T2I) were synthesized, characterized, and employed as photosensitizers in p-type dye-sensitized solar cells (p-DSSC); we have compared with corresponding single branched dye (TC1) and reference dye P1. The absorbance of the dyes in solution was red shifted and the oxidation potential gradually decreased with increasing the donating ability. It was found that modification from single branched (TC1) to double branched (T1I and T2I) system resulted in increased photocurrent density leading to the higher photovoltaic performances. The charge transporting ability is increased with the introduction of double branching, as evidenced from electrochemical impedance analysis.
- Bao, Le Quoc,Phuong, Ho,Thuy, Chau Thi Thanh,Lee, Ji Won,Kim, Jae Hong,Thogiti, Suresh
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- Synthesis, characterization, and photovoltaic properties of carbazole-based two-dimensional conjugated polymers with donor-π-bridge-acceptor side chains
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A series of carbazole-based narrow-band gap polymers with two-dimensional donor-π-bridgeacceptor (D-π-A) structures were synthesized and characterized for use in polymer bulk heterojunction solar cells. These D-π-A side-chain polymers were obtained throug
- Duan, Chunhui,Chen, Kung-Shih,Huang, Fei,Yip, Hin-Lap,Liu, Shengjian,Zhang, Jie,Jen, Alex K.-Y.,Cao, Yong
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- A fast-response electrochromic device based on a composite gel film comprising triphenylamine derivatives and WO3
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To obtain an electrochromic device with a quick response and multicolor change,N,N′-(4-((3-(triethoxysilyl)propyl)imino)methyl)phenyl-N,N′-diphenyl-4,4′-biphenyl-diamine (TPB-PSSO) containing a tetraphenylbenzidine (TPB) unit and siloxane group was synthesized, and its electrochromic properties were investigated. Using the TPB-PSSO gel film and a WO3/TPB-PSSO gel film as active materials, electrochromic devices (ECDs) having the structures indium tin oxide (ITO)/TPB-PSSO gel film/ITO and ITO/WO3film/TPB-PSSO gel film/ITO, respectively, were prepared. These two devices exhibited a fast response according to chronoamperometry measurements, with coloring and bleaching times of 4 and 9 ms and 5 and 5 ms, respectively.
- Zhang, Xuejian,Zeng, Jinming,Xu, Zipeng,Zhu, Mimi,Liu, Ping
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p. 5503 - 5508
(2021/04/06)
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- Synthesis of triphenylamine (TPA) dimers and applications in cell imaging
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A variety of triphenylamine (TPA) are shown to undergo C–C bond formation using quinone-based chloranil/H+ reagent as the metal free oxidative system to afford triphenylamine dimers very conveniently. Then, TPA dimers have been further converte
- Yuan, Yang,Yin, Pei,Wang, Tao,Yang, Zengming,Yin, Weidong,Zhang, Shaoxiong,Qi, Chunxuan,Hengchang, Ma
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- Vinyl-bridged crosslinking-type micromolecule hole transport material, preparing method and application thereof and preparing technology of crosslinking hole transport layer
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The invention discloses a preparing method of a vinyl-bridged crosslinking-type micromolecule hole transport material and structural features of the vinyl-bridged crosslinking-type micromolecule holetransport material. The invention further discloses appl
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Paragraph 0037; 0039; 0041
(2019/10/01)
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- Metal-Free Oxidative C-C Coupling of Arylamines Using a Quinone-Based Organic Oxidant
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A variety of arylamines are shown to undergo oxidative C-C bond formation using quinone-based chloranil/H+ reagent as the recyclable organic (metal-free) oxidant system to afford benzidines/naphthidines. Arylamines (3°/2°) designed with various substituents were employed to understand the steric as well as electronic preferences of oxidative dimerization, and a mechanism involving amine radical cation has been proposed. The tetraphenylbenzidine derivative obtained via oxidative C-C coupling has been further converted to blue-emissive hole-transporting material via a simple chemical transformation. This study highlights the preparation of novel HTMs in a simple, economic, and efficient manner.
- Maddala, Sudhakar,Mallick, Sudesh,Venkatakrishnan, Parthasarathy
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p. 8958 - 8972
(2017/09/11)
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- Solution-processed thermally stable amorphous films of small molecular hole injection/transport bi-functional materials and their application in high efficiency OLEDs
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A series of novel triphenylamine-based small molecular hole transport materials (HTMs) are reported for solution processed organic light-emitting devices (OLEDs). The character of this series of HTMs, denoted as TPD(BTPA)n (n = 1, 2, 4), is connecting the flexible moieties of butadiene bridged triphenylamine (BTPA) to N,N,N′,N′-tetraphenyl-[1,1′-biphenyl]-4,4′-diamine (TPD). The glass transition temperature and crystallization temperature (Tg and Tc) showed a proportional relationship with the number of BTPA moieties. The Tg value of TPD(BTPA)4 can be up to 125.5 °C, which is higher than most of the reported small molecular HTMs (Tg: 54-116 °C). The TPD(BTPA)4 spincoated film showed an outstanding thermal stability which remained amorphous even when annealed at 110 °C, for 48 h. This indicated that the breaking of the planar molecular structure with BTPA moieties can suppress intermolecular stacking. The solution processed OLEDs with 8-hydroxyquinoline aluminum (Alq3) as emission and electron transport layers showed high stability at high operation current (>400 mA cm-2). The OLED with TPD(BTPA)4 achieved a maximum current efficiency of 5.83 cd A-1 (at the operation current density > 400 mA cm-2), which is higher than the maximum current efficiency of most evaporation and solution processed OLEDs in identical structures.
- Zhao, Xiaoming,Wang, Shirong,You, Jing,Zhang, Yuteng,Li, Xianggao
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supporting information
p. 11377 - 11384
(2015/11/11)
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- Cu(II)-mediated generation of triarylamine radical cations and their dimerization. An easy route to tetraarylbenzidines
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(Chemical Equation Presented) Triphenylamine (TPA) derivatives react with Cu2+ in acetonitrile to give TPA radical cations which undergo dimerization and deprotonation reactions to yield tetraphenylbenzidines (TPB). Synthetic utility of this reaction is demonstrated using several triphenylamine derivatives, and yields in excess of 80% are obtained in most cases. Involvement of the amine radical cations in these reactions was confirmed by ESR and absorption spectroscopic studies. A mechanism consistent with all observations is proposed. This study also revealed a very good correlation between the free energy change for radical cation formation and product yields.
- Sreenath, Kesavapillai,Suneesh, Chettiyam Veettil,Ratheesh Kumar, Venugopal K.,Gopidas, Karical R.
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p. 3245 - 3251
(2008/09/20)
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