title: Convenient synthesis and characterization of silane-capped polysiloles for the fabrication of luminescent OLED.
abstract: Catalytic dehydropolymerization and subsequent silane-capping with R2SiHCI (R = Ph, Me) of 1,1-dihydrotetraphenylsilole (1) using various inorganic hydrides produces electroluminescent silane-capped polysiloles (2) in high yield. The polymerization yield and molecular weight increase in the order LiB[CH(CH3)C2H5]3H < NaB[CH(CH3)C2H5]3H < KB[CH(CH3)C2H5]3H. The molecular weights increase in the order Na[H2Al(OCH2CH2OCH3)2] < KB[CH(CH3)C2H5]3H < LiB(C2H5)3H. The silane-capped polysiloles 2 emit at 521 nm and are electroluminescent at 522 nm. The fluorescence quantum yield of 2 in toluene is (1.67 +/- 0.31) x 10(-2). The emission color is green and the maximum brightness of the device is 2900 cd/m2 with a luminous efficiency of 0.69 lm/W. The substituent type of silyl end group showed no appreciable effect on the luminescent properties of polysilole backbone. Thus, the silane-capped polysiloles are found to be a good material for OLED fabrication. A possible mechanism for the formation of 2 was suggested.
authors.affiliation: Alan G. MacDiarmid Energy Research Institute and Nanotechnology Research Center, Department of Chemistry, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: Myoung-Hee
authors.initials: MH
authors.lastname: Kim
authors.forename: So-Yeun
authors.initials: SY
authors.lastname: Kim
authors.forename: Bo-Hye
authors.initials: BH
authors.lastname: Kim
authors.forename: Hee-Gweon
authors.initials: HG
authors.lastname: Woo
authors.forename: Sook-Hyun
authors.initials: SH
authors.lastname: Park
authors.forename: You-Jeong
authors.initials: YJ
authors.lastname: Kim