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Le, Cuong M.Q.,Cao, Xuan Thang,Tu, Trang T.K.,Lee, Won-Ki,Lim, Kwon Taek Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.450 No.-
<P><B>Abstract</B></P> <P>Deep eutectic solvents (DESs), a new type of cost-effective ionic liquid analogues, were employed to develop a novel and efficient method for direct functionalization of multiwalled carbon nanotubes (MWNTs) via Diels-Alder (DA) click reaction. Poly(ionic liquid)s featuring furfuryl moieties (P(F-ILs)) and butyl moieties (P(B-ILs)) were synthesized by the functionalization of poly(chloromethylstyrene-alt-maleic anhydride) with 1-methylimidazole and furfuryl amine or butylamine. Then, the polymer was directly grafted on the surface of untreated MWNTs in choline:ethylene glycol (ChCl:EG) based DES without any catalyst. The successful functionalization of the polymer on MWNTs was confirmed by Raman spectroscopy, TGA, and XPS analysis. It was shown that the reaction proceeded in a very rapid fashion (less than an hour) and the use of DESs significantly improved the grafting density (more than double) as compared with the reaction in water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Deep eutectic solvents was utilized as a green and efficient reaction media. </LI> <LI> Fast and facile method for grafting poly(ionic liquid)s onto carbon nanotubes. </LI> <LI> High grafting density was obtained under catalyst-free and mild reaction condition. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Enhanced Light Outcoupling in Organic Light-Emitting Diodes Using Phase Separated Polymer Films
Juhee Hong,Joo Won Han,Trang T. K. Tu,Soyeon Kim,Dongchan Lim,Sung Bin Park,Souk Yoon Kim,Jung Ha Kim,Dong Woo Kim,Jonghee Lee,Kwon Taek Lim,김용현 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.4
We report high performance internal light outcoupling films based on phase separation polymer for indium tin oxide-free organic light emitting diodes (OLEDs). The two immiscible polymers of poly(amic acid) and polyimide in a blend film result in nanoporous structures after spin-coating by self-assembly process. The OLEDs are prepared by solution process including phase separation films and transparent electrodes, allowing for low-cost and high-speed manufacturing. The phase separation films prepared between the glass substrate and the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) transparent electrode remarkably improve the outcoupling performance of OLEDs. The poly(methyl methacrylate) (PMMA)-assisted phase separation films significantly improve the external quantum efficiency and power efficiency of OLEDs by a factor 1.88 and 1.87, respectively, compared to the reference device without any outcoupling structure. Our results demonstrate that phase separation films developed here offer new opportunities in improving the outcoupling efficiency in OLEDs.