- Yellow electrochromic polymer materials with fine tuning electrofluorescences by adjusting steric hindrance of side chains
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A series of novel conducting conjugated yellow-to-transmissive electrochromic (EC) polymers were designed and synthesized to research their structure-property relationships, achieving electrofluorescent (EF) switching with applied external potential. These bifunctional materials are based on repeat units of bi-phenyl-1,3,4-oxadiazole and thiophene derivatives with different side chains. The polymers present a similar yellow color and emit various fluorescences with applied reduction potential, and they can turn to nearly transparent and non-fluorescent with oxidization potential. The optical contrast, electrochemical, electrochromic and electrofluorescent switching properties were also characterized in detail. A device containing these polymers was also fabricated that can achieve electrochromic and electrofluorescent switching simultaneously, making these polymers promising candidates for electro-bifunctional materials.
- Liu, Jian,Shi, Yuchen,Wu, Jingchuan,Li, Mei,Zheng, Jianming,Xu, Chunye
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- Oxadiazole-based highly efficient bipolar fluorescent emitters for organic light-emitting diodes
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In this study, a series of bipolar fluorescence emitters named 2DPAc-OXD, DPAc-OXD, 2PTZ-OXD and PTZ-OXD were designed and synthesized with excellent yields. The characterization of materials was investigated by using nuclear magnetic resonance (NMR) (1H, 13C), mass spectrometry and thermogravimetric analysis (TGA). To investigate device efficiencies, two different OLED devices (Device 1, Device 2) were fabricated with two different host materials (Bepp2, DPEPO). The Device 2 with 2PTZ-OXD as fluorescent emitter exhibited excellent power and current efficiencies of 6.88 Lm/W and 10.10 cd/A, respectively. The external quantum efficiency of 2PTZ-OXD was around 3.99% for Device 2. The overall device properties of phenothiazine donor were better than acridine derivatives.
- Wu, Qiong,Braveenth, Ramanaskanda,Zhang, Heng Qiang,Bae, Il-Ji,Kim, Miyoung,Chai, Kyu Yun
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- Oxadiazole- and indolocarbazole-based bipolar materials for green and yellow phosphorescent organic light emitting diodes
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New bipolar materials, namely 2-phenyl-5-(4-(5-phenylindolo [3,2-a]carbazol-12(5H)-yl)phenyl)-1,3,4-oxadiazole (ICz-OXD) and 2,5-bis(4-(5-phenylindolo [3,2-a]carbazol-12(5H)-yl)phenyl)-1,3,4-oxadiazole (2ICz-OXD), were designed and synthesized. Tree different devices were fabricated using ICz-OXD and 2ICz-OXD as host and fluorescent materials: a green phosphorescent, yellow phosphorescent, and non-doped fluorescent OLED emitter. The yellow phosphorescent OLED device based on the 2ICz-OXD host presented good maximum current, power, and external quantum efficiencies, whose values were 47.55 cd/A, 49.80 lm/W, and 21.54%, respectively. Its efficiencies were better than those of the devices based on ICz-OXD and on the reference material 4,4′-Bis(N-carbazolyl)-1,1′-biphenyl (CBP). The green phosphorescent OLED device with ICz-OXD revealed higher efficiencies than the device based on 2ICz-OXD. The current, power, and external quantum efficiencies based on ICz-OXD were 49.79 cd/A, 52.14 lm/W, and 16.50%, respectively. The non-doped fluorescent devices that used our bipolar materials (ICz-OXD, 2ICz-OXD) exhibited blue emission at 435 and 442 nm.
- Wu, Qiong,Braveenth, Ramanaskanda,Bae, Il-Ji,Zhang, Heng-Qiang,Jung, Hasu,Kim, Miyoung,Chai, Kyu Yun
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- Solution-processed oxadiazole-based electron-transporting layer for white organic light-emitting diodes
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A novel alcohol-soluble electron-transporting small-molecule material comprising oxadiazole and arylphosphine oxide moieties, ((1,3,4-oxadiazole-2,5-diyl)bis(4,1-phenylene))bis(diphenylphosphine oxide) (OXDPPO), has been synthesized and characterized. Its
- Liu, Ronghua,Xu, Xinjun,Peng, Jinghong,Yao, Chuang,Wang, Jinshan,Li, Lidong
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Read Online
- Soluble bipolar star-shaped molecule as highly stable and efficient blue light emitter
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A star-shaped blue small-molecule 1,3,5-tris(5-(4-(3,6-di-tert-butylcarbazol-9-yl)phenyl)-1,3,4-oxadiazol-2-yl)benzene (S-Cz-OXD) with donor-π-acceptor (D-π-A) structure was designed and synthesized by incorporating three (3,6-di-tert-butyl-9H-carbazol-9-
- He, Xuehan,Chen, Lei,Zhao, Yongbiao,Ng, Siu Choon,Wang, Xizu,Sun, Xiaowei,Hu, Xiao
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Read Online
- Triphenylamine based conjugated microporous polymers for selective photoreduction of CO2 to CO under visible light
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Organic π-conjugated polymers (CPs) have been intensively explored for a variety of critical photocatalytic applications in the past few years. Nevertheless, CPs for efficient CO2 photoreduction have been rarely reported, which is mainly due to
- Dai, Chunhui,Zhong, Lixiang,Gong, Xuezhong,Zeng, Lei,Xue, Can,Li, Shuzhou,Liu, Bin
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supporting information
p. 6606 - 6610
(2019/12/26)
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- Synthesis method of 2,5-disubstituted-1,3,4-oxadiazole
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The invention discloses a synthesis method of a drug intermediate, namely, 2,5-disubstituted-1,3,4-oxadiazole. 2,5-disubstituted-1,3,4-oxadiazole is synthesized with a one-pot method under the photocatalytic action with simple hydrazide compounds as raw materials. 2,5-disubstituted-1,3,4-oxadiazole can be produced through a reaction at the room temperature with a common halogen lamp as a light source, eosinY as a catalyst, potassium carbonate as an additive and ethanol as a solvent. The method has the characteristics that the raw material source is simple, the reaction condition is mild and the like.
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Paragraph 0007; 0031
(2018/08/04)
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- ORGANIC COMPOUNDS AND ORGANIC ELECTRO LUMINESCENCE DEVICE COMPRISING THE SAME
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The present invention relates to a novel organic compound and an organic electroluminescent device comprising the same. The organic electroluminescent device with improved luminous efficiency, driving voltage, and service life can be provided by introducing a light emitting layer using a triazolebiscarbazole-based compound as a host material to the organic electroluminescent device.
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- Efficient oxidative cyclisation of acid hydrazides to 2,5-disubstituted 1,3,4-oxadiazoles catalysed by Bu4NI with t-BuOOH as oxidant
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Acid hydrazides or araldehyde N-acylhydrazones can be converted in good yields to, respectively, symmetrical or unsymmetrical, 2,5-disubstituted 1,3,4-oxadiazoles at 60 °C by a Bu4NI-catalysed procedure which requires the presence of a base and 2.5 equiv. of t-butyl hydroperoxide.
- Gao, Peng,Wei, Yunyang
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p. 506 - 510
(2013/09/12)
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- Synthesis and functional properties of symmetrically naphthyl-Based oligoarylenes with high glass-transition temperatures
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Symmetrically naphthyl-based π-conjugated oligoarylenes, OPP(4)Ph-TNp, OPP(4)An-TNp and OPP(4)OXTNp have successfully been synthesized by a divergent approach using Pd-catalyzed Suzuki cross-coupling reaction of diiodo- or dibromo-oligoarylene and arylboronic acid as a key step. Their optical, electrochemical and thermal properties have also been characterized. These newly synthesized naphthyl-based oligoarylenes show highly morphological (Tg 149-187 °C) and thermal (Tdec 509-597 °C) stabilities as well as exhibit potential applications in optoelectronic fields.
- Zhang, Xiaolinga,Sun, Kanga,Liu, Yurong,Xiong, Mojunb,Xia, Pingfanga,Li, Zhonghui,Cao, Zijian
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experimental part
p. 1034 - 1040
(2010/10/18)
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- Novel molecular structures with controllable electron conducting properties
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Aromatic and heteroaromatic molecular structures with controllable electron conducting properties are derived from the incorporation of electron active substituents in selective positions. Such compounds can form self-assembled layers on metal or other su
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- Synthesis and optical properties of copolymers containing carbazole and 1,3,4-oxadiazole groups as blue host matrix and charge transport materials for polymer light emitting devices
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Alternating copolymers with N-arylcarbazole as hole injection and transport moieties with blue emission and 1,3,4-oxadiazole as electron transporting and hole blocking moieties were synthesized by Pd-catalyzed polycondensation reaction, and named as poly[
- Wang, Hui,Ryu, Jeong-Tak,Han, Yoon Soo,Kim, Dae-Hwan,Choi, Byeong Dae,Kwon, Younghwan
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- Poly(p-phenylenevinylene) derivatives containing electron-transporting aromatic triazole or oxadiazole segments
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We report the synthesis, optical and electrochemical details, and properties of copolymers P1-P3 consisting of alternate hole-transporting 1,4-bis(hexyloxy)-2,5-distyrylbenzene (HDB) and electron-transporting 4-(4-(hexyloxy)phenyl)-3,5-diphenyl- 4H-1,2,4-
- Chen, Shinn-Horng,Chen, Yun
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- New series of blue-emitting and electron-transporting copolymers based on fluorene
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A novel series of conjugated copolymers having oxadiazole, quinoline, quinoxaline, and phenylenecyanovinylene moieties in the main chain based on fluorene were synthesized in good yields by palladium-catalyzed Suzuki coupling reaction, a new approach different from the traditional polyhydrazide precursor route (oxadiazole-containing polymers), acid-catalyzed Friedlaender condensation reaction (polyquinolines), and Knoevenagel condensation polymerization (poly(phenylenecyanovinylene)). The thermal, electrochemical, and optical properties of these copolymers were examined. All these polymers possess excellent thermal stability with glass transition temperatures of 114-208 °C and onset decomposition temperatures of 387-415 °C. Cyclic voltammetry studies reveal that these copolymers possess low-lying LUMO energy levels ranging from -3.01 to -3.37 eV and low-lying HOMO energy levels ranging from -6.13 to -6.38 eV and may be promising candidates for electron-transporting or hole-blocking materials in light-emitting diodes. The polymers in thin films emit strong blue luminance around 414-476 nm with narrow bandwidth upon photoexcitation. Photoluminescence spectra of the polymers in the films are only red-shifted by 7-11 nm compared to those in the solution, indicating that the aggregation and the excimer fluorescence are suppressed.
- Zhan, Xiaowei,Liu, Yunqi,Wu, Xia,Wang, Shuai,Zhu, Daoben
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p. 2529 - 2537
(2007/10/03)
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