Gui-An Wen

Cruciform p-n diblock conjugated oligomers for electroluminescent applications

The optoelectronic properties of the cruciform p–n diblock oligomers 1–3 can be independently tuned by the oligofluorene and oxadiazole branches to increase the charge mobility.

Cadmium telluride nanocrystals : synthesis, growth mode and effect of reaction temperature on crystal structures

A series of cadmium telluride (CdTe) nanocrystals were synthesized by a modified organometallic synthesis method at various reaction temperatures ranging from 130 to 250°C. In this method, octadecylamine (ODA) was introduced as an additional coordinating component to the mixture of trioctylphosphine oxide (TOPO) and trioctylphosphine (TOP). CdO was used as a precursor. The prepared CdTe nanocrystals were studied by the absorption and emission spectra as well as the powder X-ray diffraction (XRD) patterns. The result shows that besides the traditional continuous-growth mode observed frequently at relatively high reaction temperature, a discontinuous-growth mode was confirmed at the initial growth stage of CdTe nanocrystals, arising from the change of the absorption spectra of CdTe nanocrystals with the reaction time at relatively low reaction temperature. The structures of CdTe nanocrystals, e.g., the cubic zinc blende structure at 160°C and the hexagonal wurtzite structure at 250°C, were characterized by XRD.

SYNTHESIS AND CHARACTERIZATION OF A PHOTO-CROSSLINKABLE BLUE LIGHT-EMITTING POLYFLUORENE: SYNTHESIS AND CHARACTERIZATION OF A PHOTO-CROSSLINKABLE BLUE LIGHT-EMITTING POLYFLUORENE

A photo-crosslinkable ployfluorene with oxetane group was synthesized and characterized by NMR,elemental analysis,etc.It was evidenced that the introduction of photocrosslinkable oxetane group has very little effect on the blue-light-emission of polyfluorene.Insoluble polyfluorene films were obtained by crosslinking with the addition of the triarylsulfonium salt photoinitiator under UV irriation.It was revealed that the optoelectronic properties of crosslingked polyfluorene displayed little change compared with uncrosslinked polyfluorenes.