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Showing papers by "Alex K.-Y. Jen published in 2000"



Journal ArticleDOI
TL;DR: In this paper, a multilayer polymer light-emitting diodes using a binaphthyl-containing polyfluorene as the emitting layer and a series of thermally polymerized triphenylamine/tetraphenyldiaminobiphenylcontaining polymers as the hole transport layer is presented.
Abstract: We report efficient blue electroluminescence (EL) from multilayer polymer light-emitting diodes using a binaphthyl-containing polyfluorene as the emitting layer and a series of thermally polymerized triphenylamine/tetraphenyldiaminobiphenyl-containing polymers as the hole transport layer The polymer possesses a high photoluminescence quantum efficiency of 44% The polymer light-emitting diodes exhibit EL emission peak at 420 or 446 nm, depending on the hole transporting materials The EL reaches maximum brightness and external quantum efficiency of 3070 cd/m2 and 082%, respectively

79 citations


Journal ArticleDOI
Hong Ma1, Jianyao Wu1, Petra Herguth1, Baoquan Chen1, Alex K.-Y. Jen1 
TL;DR: A series of novel second-order nonlinear opitcal (NLO) thermoset polymers containing silicon-perfluorocyclobutane (PFCB) has been developed as discussed by the authors.
Abstract: A series of novel second-order nonlinear opitcal (NLO) thermoset polymers containing silicon-perfluorocyclobutane (PFCB) has been developed. The synthesis was accomplished using the cross-linking reaction between the di(trifluorovinylether)-containing NLO chromophores and the tris(trifluorovinylether) monomer in a solid state at 180−250 °C. The preliminary results have indicated these polymers to possess excellent processability, low optical loss, and a combination of the highly desirable thermal, nonlinear optical, and mechanical properties.

73 citations


Journal ArticleDOI
TL;DR: In this article, the authors used in situ thermally polymerized hole transporting materials containing triphenylamine/tetraphenyldiaminobiphenyl as side chains.
Abstract: We have fabricated highly efficient organic light-emitting diodes (LEDS) using in situ thermally polymerized hole transporting materials containing triphenylamine/tetraphenyldiaminobiphenyl as side chains. Double-layer LEDs made with these thermally polymerized polymers as the hole transporting layer and tris(8-hydroxyquinoline) aluminum as the emitting layer showed comparable brightness but lower turn-on voltages and better quantum efficiencies than the device made with the conventional hole transporting molecule, N-N′-diphenyl-N,N′-bis(3-methylphenyl)(1,1′-biphenyl)-4,4′-diamine.

46 citations


Journal ArticleDOI
TL;DR: In this article, the first intrinsic hyperpolarizability β was determined for 10 new thiophene-based charge transfer (CT) chromophores using the hyper-Rayleigh scattering (HRS) technique at the wavelengths of 1064 and 1907 nm.

22 citations


Journal ArticleDOI
TL;DR: A series of highly efficient, chemically and thermally stable (>310 °C) nonlinear optical chromophores were prepared through the replacement of the most reactive CN group in tricyanovinylthiophene derivatives with perfluoroaryl units.
Abstract: A series of highly efficient, chemically and thermally stable (>310 °C) nonlinear optical chromophores were prepared through the replacement of the most reactive CN group in tricyanovinylthiophene derivatives with perfluoroaryl units.