Browsing by Author "Huang, Tai-Hsiang"

Now showing 1 - 2 of 2

Dibenzothiophene/oxide and quinoxaline/pyrazine derivatives serving as electron-transport materials
(2006-07-21)
Huang, Tai-Hsiang
;
Whang, Wha-Tzong
;
Shen, Jiun Yi
;
Wen, Yuh-Sheng
;
Lin, Jiann T.
A series of 2,8-disubstituted dibenzothiophene and 2,8-disubstituted dibenzothiophene-SS-dioxide derivatives containing quinoxaline and pyrazine moieties are synthesized via three key steps: i) palladium-catalyzed Sonogashira coupling reaction to form dialkynes; ii) conversion of the dialkynes to diones; and iii) condensation of the diones with diamines. Single-crystal characterization of 2,8-di(6,7-dimethyl-3-phenyl-2-quinoxalinyl)-5H-5 lambda(6)-dibenzo[b,d]thiophene-5,5-dione indicates a triclinic crystal structure with space group P1 and a non-coplanar structure. These new materials are amorphous, with glass-transition temperatures ranging from 132 to 194 degrees C. The compounds (Cpd) exhibit high electron mobilities and serve as effective electron-transport materials for organic light-emitting devices. Double-layer devices are fabricated with the structure indium tin oxide (ITO)/Qn/Cpd/LiF/Al, where yellow-emitting 2,3-bis[4-(N-phenyl-9-ethyl-3-carbazolylamino)phenyl]quinoxaline (Qn) serves as the emitting layer. An external quantum efficiency of 1.41 %, a power efficiency of 4.94 lm W-1, and a current efficiency of 1.62 cd A(-1) are achieved at a current density of 100 mA cm(-2).
Effects of Liquid Crystal Compositions on Polymer Stabilized Blue Phase Liquid Crystals
(2010)
Wang, Ling-Yung
;
Huang, Tai-Hsiang
;
Sugiura, Norio
;
Liau, Wei-Lung
;
Han, Chun-Chieh
The compositions of polymer stabilized blue phase liquid crystals (PS-BPLCs) relating to the thermal properties and electro-optical ones which are important for both display performance and productivity were investigated in this paper. By optimizing quantity of chiral-dopants and new monomers, temperature range of the BPLCs could successfully be enlarged.