Full-color display has always been a research focus and technical difficulty in the field of display. One of the current research hotspots is the use of color conversion layer (CCL) technology to achieve full-color display. Ultraviolet or blue LEDs can be converted by CCL to achieve full-color pixel display. Compared with traditional technologies, this technology does not require steps such as mass transfer. This method greatly simplifies the processing of full-color display. In this paper, we propose a method to achieve two-color patterned display of perovskite thin films by laser direct writing technology. The laser acts on the perovskite quantum dot thin film covered by the polymer film to form pattern or array based on photo-quench. Then other color perovskite quantum dot solutions is spin-coated. At last, the upper quantum dot film is washed off with solvent. Due to the protective effect of the polymer film, the coexistence of two-color quantum dots is realized. This method not only broadens the application of quantum dots in display, but also provides a new idea for the subsequent laser direct writing technology to realize multi-color or even full-color display.
Laser propulsion in air or vacuum has been developed as a thruster technology for the attitude control of micro class satellites. Laser propulsion in water can be used as a technology for propelling underwater platform or controlling microfluid device. Laser propulsion effects in water are much better in air due to the force from laser-induced bubble in water. The target geometries will influence the propulsion effects in air. In order to investigate the influence of target geometries on laser propulsion in water, targets with/without conical cavity and hemispherical cavity are designed in this paper. The momentum IT gained by targets and the momentum coupling coefficient Cm are investigated experimentally by high-speed photography method. It shows that the propulsion effects are better if there is a cavity on the laser irradiated surface of the target, and a hemispherical cavity works better than a conical cavity. In addition, IT increases with the laser energy, but the increasing trend slows gradually, and Cm increases with the laser energy first, and then levels off for all four targets. These results are both due to the laser plasma shielding. In conclusion, we need design suitable target geometries and use optimal laser energy to get the best propulsion effect for controlling microfluid device or micro class satellites.
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