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dc.contributor.authorChen, CHen_US
dc.contributor.authorWu, FIen_US
dc.contributor.authorShu, CFen_US
dc.contributor.authorChien, CHen_US
dc.contributor.authorTao, YTen_US
dc.date.accessioned2014-12-08T15:39:53Z-
dc.date.available2014-12-08T15:39:53Z-
dc.date.issued2004en_US
dc.identifier.issn0959-9428en_US
dc.identifier.urihttp://hdl.handle.net/11536/27254-
dc.identifier.urihttp://dx.doi.org/10.1039/b402584aen_US
dc.description.abstractWe report the synthesis of spirobifluorene-based pyrazoloquinolines, spiro-PAQ-Me and spiro-PAQ-Ph, in which two identical luminophores are connected through an sp(3)-hybridized carbon atom (a spiro center) and are orthogonally arranged. The incorporation of the rigid spirobifluorene linkage results in significant increases in the glass transition temperatures, which are in the range 246-280degreesC. These new materials display the characteristic absorptions of the mono-pyrazoloquinoline (i.e. non-spiro) derivatives, each with a broad, low-energy absorption at ca. 420 nm, and emit photoluminescence efficiently in the blue region. Electrochemical studies reveal that these compounds exhibit reversible reductions and low-lying LUMO energy levels that originate from the electron-deficient nature of the pyrazoloquinoline ring. Multilayer organic electroluminescent devices constructed using spiro-PAQ-Ph as a dopant in the emitting layer produced bright blue emissions with maximum luminescence exceeding 20 000 cd m(-2). For the 2.0%-doped device, a high external quantum efficiency of 3.6% (4.5 cd A(-1), 2.02 lm W-1) was achieved at 20 mA cm(-2) and 7.0 V with color coordinates of (0.14, 0.17).en_US
dc.language.isoen_USen_US
dc.titleSpirobifluorene-based pyrazoloquinolines: efficient blue electroluminescent materialsen_US
dc.typeArticleen_US
dc.identifier.doi10.1039/b402584aen_US
dc.identifier.journalJOURNAL OF MATERIALS CHEMISTRYen_US
dc.citation.volume14en_US
dc.citation.issue10en_US
dc.citation.spage1585en_US
dc.citation.epage1589en_US
dc.contributor.department應用化學系zh_TW
dc.contributor.departmentDepartment of Applied Chemistryen_US
dc.identifier.wosnumberWOS:000221507200016-
dc.citation.woscount42-
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