Nanotechnology

Study data from Pusan National University provide new insights into macromolecular research

  2008 NOV 3 - (VerticalNews.com) -- According to recent research from South Korea, "A new series of green electroluminescencc polymers, poly[ (2-(3,7-dimethyloctyloxy)-3,5,6-trimethoxy-1,4-phenylenevinylene)] [poly(30C(1)OC(10)-PV)] and poly[2-(3-dimethyldodecylsilylphenyl)-l,4-phenylenevinylene] [poly(m-SiPh-PV)], and their corresponding copolymers, poly[2-{(3,7-dimethyloctyloxy)-3,5,6-trimethoxy-l,4-phenylenevinylenel-co-(2-(3-dimethyldodecylsilylphenyl)-l,4-phenylenevinylene)] [poly(30C(1)OC(10)PV-co-m-SiPh-PV)], were synthesized through the Gilch polymerization method. The newly designed and highly branched molecular structures of the polymers, poly(30C(1)OC(10)-PV), poly(30C(1)OC(10)-PV-co-m-SiPh-PV) and poly(m-SiPh-PV), were completely soluble in common organic solvents and easily spin-coated onto an ITO-coated glass substrate to obtain high quality optical thin films."

  "The weight-average molecular weight (M,) and polydispersity of poly(30C(1)OC(10)-PV) were 17.3 x 10(4) and 2.9, respectively, while those of poly(30C(1)OC(10)-PV-co-m-SiPh-PV) were in the range of (20.5-101.8) x 10(4) and 3.2-6.7, respectively. We fabricated polymer light-emitting diodes in ITO/PEDOT/emitting polymer/cathode configurations using either double-layer, LiF/Al. or triple-layer, LiF/Ca/Al, cathode structures. The emission maxima of the polymers, regardless of the copolymer compositions, were around 544-560 nm, which is a green color," wrote J.S. Park and colleagues, Pusan National University.

  The researchers concluded: "The turn-on voltages of the EL polymers were in the range of 2.5-5.5 V, and the maximum brightness and luminance efficiency were 15.330 cd/m(2) at 10 V and 4.44 cd/A at 11 V, respectively."

  Park and colleagues published their study in Macromolecules (Synthesis and characterization of highly branched poly(P-phenylenevinylene) derivatives for polymer light-emitting diode applications. Macromolecules, 2008;41(18):6696-6702).

  For additional information, contact S.H. Jin, Pusan National University, Dept. of Chemical, Education & Interdisciplinary Program Advanced Informat & D, Pusan 609735, South Korea.

  Publisher contact information for the journal Macromolecules is: American Chemical Society, 1155 16th St., NW, Washington, DC 20036, USA.

  Keywords: Emerging Technologies, Nanotech, Nanotechnology, Polymer Light Emitting DiodesMacromolecular Research, Pusan National University.

  This article was prepared by VerticalNews Nanotechnology editors from staff and other reports. Copyright 2008, VerticalNews Nanotechnology via VerticalNews.com.