Effect of a perfluorocyclopentene core unit on the structures and photoluminescence of fluorene- and anthracene-based compounds |
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Authors: | Mijung Han Jonghwa Jung Soon-Ki Kwon Phil Ho Lee |
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Institution: | a National Research Laboratory of Catalytic Organic Reaction, Division of Science Education and Department of Chemistry, Kangwon National University, Chuncheon 200-701, Republic of Korea b Research Institute of Natural Sciences, Department of Chemistry and School of Nano & Advanced Materials Engineering and ERI, Gyeongsang National University, Chinju 660-701, Republic of Korea c Department of Chemistry, Korea University, Jochiwon, Chungnam 339-700, Republic of Korea |
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Abstract: | A novel series of blue luminescent compounds, in which three identical functional groups, such as fluorene, anthracene, and spiro-bifluorene, are linked distortedly around a perfluorocyclopentene core, have been synthesized and characterized. The introduction of a perfluorocyclopentene linkage into the molecular framework leads to an enhancement of the photoluminescence (PL) efficiency and thermal stability. All compounds exhibit intense blue photoluminescence, which has been attributed to fluorene- or anthracene-based π→π* transitions. The maximum emission wavelengths of all compounds at room temperature are in the region of 420-480 nm, with higher PL quantum efficiencies than in 9,10-diphenylanthracene. The electroluminescent (EL) properties of compound 4, 1,2-bis(9,9′-spirobifluoren-2-yl)-3,3,4,4,5,5-hexafluorocyclopentene, were investigated. A multilayer EL device with the configuration of ITO/2TNATA(60 nm)/NPB(20 nm)/ADN:2%-compound-4(35 nm)/Alq3(20 nm)/LiF(2 nm)/Al has been successfully fabricated. |
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Keywords: | Perfluorocyclopentene Optical properties X-ray structure OLEDs |
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