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A New Ambipolar Copolymer for Organic Thin Film Transistor with a New Donor Unit
( Wu Xinwei ),( Suncheng ),송형근,김윤희 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
We synthesis and characterized a new copolymer of OTFT. We design the structure with a new donor unit for copolymer. And the electron acceptor unit is previously reported as a high efficiency electron transport unit. The new copolymer is design for obtain a perfect balance in electron and charge transport in order to improve the optical and electrochemical property. It also possessed appropriate HOMO and LOMO. Moreover the copolymer would be beneficial for increasing the oxidative stability of polymer. As the same time, the new copolymer performed a high resistance to thermal shocks.
A new ambipolar copolymer for organic electronics
Xinwei Wu,Cheng Sun,송형건,김윤희 한국정보디스플레이학회 2018 Journal of information display Vol.19 No.1
The 5-(heptadecan-9-yl)dithieno[3,2-b:2 ,3 -d]pyridine (NET) structure was designed as a new donor unit for copolymer synthesis. Benzothiadiazole (BT) was used as the electron acceptor unit. The new donor–acceptor copolymer was obtained through the Stille coupling reaction. The density functional theory analysis of the new copolymer showed that the highest occupied molecular orbital electron density was localized on the NET unit while the lowest unoccupied molecular orbital electron density was localized partially on the BT and partially on the pyridine group of the NET unit. The polymer presented good solubility and thermal stability, which are desirable properties for use in solution-processed devices. The new polymer is expected to show a potential for application in organic electronics, such as thin-film transistors.
1P-15 A New Bulk Heterojunction Polymer for Organic Photovoltaics
( Wu Xinwei ),박성종,김윤희,권순기 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Polymer solar cells based on bulk heterojunction structure have been attracting a lot of attention because of the potential for low-cost, largearea, flexible and lightweight. As we known, benzodithiophene (BDT) unit is a novel conjugated polymers part. And we designed the structure with a new acceptor unit (TPP) which has alkoxyphenyl substituent on thienopyrroledione unit. Thus we synthesis and characterized two polymers OBDT-TPP and EBDT-TPP. OBDT-TPP with linear alkoxy side chain on BDT unit showed a power conversion efficiency (PCE) of 1.55%, while EBDT-TPP showed PCE of 2.07%. UV-visible absorption and cyclic voltammetry measurements reveal that the different side chins on BDT unit have little influences on the optical band gap and the energy levels of the polymers. The XRD studies and hole mobility measurement exhibited increased polymer crystallinity and hole carrier mobility in EBDT-TPP:PC71BM blends. Thus solar cell with EBDT-TPP achieved a higher PCE.
A new ambipolar copolymer for organic electronics
Wu, Xinwei,Sun, Cheng,Song, Hyeng gun,Kim, Yun-Hi The Korean Infomation Display Society 2018 Journal of information display Vol.19 No.1
The 5-(heptadecan-9-yl)dithieno[3,2-b:2',3'-d]pyridine (NET) structure was designed as a new donor unit for copolymer synthesis. Benzothiadiazole (BT) was used as the electron acceptor unit. The new donor-acceptor copolymer was obtained through the Stille coupling reaction. The density functional theory analysis of the new copolymer showed that the highest occupied molecular orbital electron density was localized on the NET unit while the lowest unoccupied molecular orbital electron density was localized partially on the BT and partially on the pyridine group of the NET unit. The polymer presented good solubility and thermal stability, which are desirable properties for use in solution-processed devices. The new polymer is expected to show a potential for application in organic electronics, such as thin-film transistors.
Study of Deflection Routing from an Information-theoretic Perspective
Xinwei Zheng,Yuping Hu,Dongjun Luo,Xiaoyun Wu 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1
Deflection routing is an effective way to improve the efficiency and reliability of data transmission in the network. Information theory, which is the foundation of channel communications, has not yet had a direct impact on network communications. In this paper, we study the deflection routing processes of point-to-point networks from an information-theoretic perspective. It is found that the packet routing processes, which can further be divided into path determination and path switching, are quite analogous to channel communications. And such a corresponding relationship makes it possible to analyze routing processes and its performance with models and concepts in the information theory.
Dongjun Luo,Xiaoyun Wu,Xinwei Zheng,Yuping Hu 보안공학연구지원센터 2014 International Journal of Security and Its Applicat Vol.8 No.6
Cloud computing platforms are usually constructed as trusted virtual platforms based on trusted computing technologies. This is one of the most effective approaches to resolve cloud computing security problems. However, the protection of sensitive data in trusted virtual platforms is an important problem needed to be resolved. In this paper, we proposed a novel authorization protocol. The protocol assembled the functions of OIAP, OSAP and AACP protocols, and prevented all known attacks in existing authorization protocols. Moreover, it satisfied the property of exclusivity and was compatible with TCG TPM command formats. The protocol effectively protects the sensitive data from unauthorized accesses in trusted cloud computing platforms.
Highly-twisted pyrene derivative for pure-blue organic light emitting diodes
손선영,Xinwei Wu,박광훈,안형주,정성준,권순기,김윤희 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-
The newfluorescent blue host material, 1,3,6,8-tetrakis(2,5-dimethylbiphenyl-4-yl)pyrene (BD4PP), wassynthesized for pure-blue organic light-emitting diodes (OLEDs). BD4PP has highly twisted and stericstructure for efficientfluorescence, and has high thermal stability of 492 C. BD4PP host doped with 5 wt. % 4,40-bis(9-ethyl-3-carbazovinylene)-1,10-biphenyl (BCzVBi) or 5 wt. % 1,4-bis[2-(3-N-ethylcarbazoryl)-vinyl]benzene (BCzVB) showed high device efficiencies due to wide bandgap (~3.1 eV) and electron-richhost. An OLED with the BD4PP:BCzVB emitter showed higher current and external quantum efficienciesof 4.41 cd/A and 3.80% with color coordinates (0.16, 0.13) compared to those of the BD4PP:BCzVBi (3.63cd/A and 3.62%) with color coordinates (0.16, 0.11) and non-doped BD4PP (2.01 cd/A and 1.61%) with colorcoordinates (0.18, 0.13).