Huang Yuanshen

Superhydrophilic and Wetting Behavior of TiO2 Films and their Surface Morphologies

TiO2 films, showing superhydrophilic behavior, are prepared by electron beam evaporation. Atomic force microscopy and the contact angle measurement were performed to characterize the morphology and wetting behavior of the TiO2 films. Most studies attribute the wetting behavior of TiO2 surfaces to their physical characteristics rather than surface chemistry. These physical characteristics include surface morphology, roughness, and agglomerate size. We arrange these parameters in order of effectiveness. Surface morphologies are demonstrated to be the most important. TiO2 films with particular morphologies show superhydrophilic behavior without external stimuli, and these thin films also show stable anti-contamination properties during cyclical wetting and drying.

A double-layer phosphor package with high efficiency of white-light-emitting diodes

A double-layer phosphor package of white LED has been proposed. Calculation has been showed that the efficiency of double-layer phosphor package improves a lot and the multi-layer phosphor package also has higher efficiency.