The Electroluminescence thin films of zinc sulfide do ped with erbium, fabricated by thermal evaporation with two boats, are analyzed by the technology of X-ray diffraction (XRD) and X-ray photoelectron spectrosc opy ...The Electroluminescence thin films of zinc sulfide do ped with erbium, fabricated by thermal evaporation with two boats, are analyzed by the technology of X-ray diffraction (XRD) and X-ray photoelectron spectrosc opy (XPS). The relationship between electroluminescence brightness and microst ructure of the thin films is obtained. The analysis results of XRD indicate th at the fabricated zinc sulfide thin films belong to the blende structure and hav e a trend of preferential orientation. The XPS measurements reveal the surface m icrostructure states formed mainly by oxygen absorption and carbon absorption th at effect on the EL excitation and relaxation luminescence process. The maximum photoelectron peak corresponding to the doped erbium is detected at a depth of 1 35nm to 350nm that formed the activation layer in the films. Analysis shows that the high brightness of the film devices is attributed to the crystalline planes of growth orientated in the (311), (400). In explanation of this phenomenon, th e status of the substitute energy for Er 3+ replacing Zn 2+ in the hos t lattice of zinc sulfide is discussed. All results of describing above are referable in researching of the electroluminescence excitation machnism of the t hin film devices and in favor of fabricating the thin film devices with high qua lity.展开更多
Droplet splitting technology presents considerable potential for advancing applica-tions in sample encapsulation,manipulation,chemical reaction control,and preci-sion measurement systems.However,existing methodologies...Droplet splitting technology presents considerable potential for advancing applica-tions in sample encapsulation,manipulation,chemical reaction control,and preci-sion measurement systems.However,existing methodologies frequently encounter limitations related to complex operation and high cost.To address the need for controllable,high-precision,and cost-efficient droplet splitting,this study combines three-dimensional printing technology with superhydrophobic surface modification to fabricate pyramid microstructures with customized splitting functionalities.The pyramidal sharp edges act as“fluidic blades”to split droplets through the synergistic interaction of edge-induced capillary forces and inertial forces generated at the liquid film periphery during spreading dynamics.Upon penetration by the pyramid apex,the droplet forms an annular liquid ring that subsequently fragments into sub-droplets,enabling programmable splitting.A comprehensive experimental and computational framework was developed to investigate splitting dynamics,force distribution pat-terns,and geometric dependence of pyramid structures on splitting performance.Results indicate that increased Weber numbers,larger droplet volumes,and reduced pyramid apex angles markedly improve splitting controllability.Additionally,six-and 12-sided pyramid-based splitting/collection devices were engineered to demonstrate practical implementations,including on-demand droplet splitting and liquid marble synthesis.This work establishes a scalable,low-cost platform for precision droplet manipulation with significant implications for microfluidic devices and lab-on-a-chip technologies.展开更多
文摘The Electroluminescence thin films of zinc sulfide do ped with erbium, fabricated by thermal evaporation with two boats, are analyzed by the technology of X-ray diffraction (XRD) and X-ray photoelectron spectrosc opy (XPS). The relationship between electroluminescence brightness and microst ructure of the thin films is obtained. The analysis results of XRD indicate th at the fabricated zinc sulfide thin films belong to the blende structure and hav e a trend of preferential orientation. The XPS measurements reveal the surface m icrostructure states formed mainly by oxygen absorption and carbon absorption th at effect on the EL excitation and relaxation luminescence process. The maximum photoelectron peak corresponding to the doped erbium is detected at a depth of 1 35nm to 350nm that formed the activation layer in the films. Analysis shows that the high brightness of the film devices is attributed to the crystalline planes of growth orientated in the (311), (400). In explanation of this phenomenon, th e status of the substitute energy for Er 3+ replacing Zn 2+ in the hos t lattice of zinc sulfide is discussed. All results of describing above are referable in researching of the electroluminescence excitation machnism of the t hin film devices and in favor of fabricating the thin film devices with high qua lity.
基金National Natural Science Foundation of China,Grant/Award Numbers:U23A20632,52275420National Key R&D Programof China,Grant/Award Number:2022YFB3403304。
文摘Droplet splitting technology presents considerable potential for advancing applica-tions in sample encapsulation,manipulation,chemical reaction control,and preci-sion measurement systems.However,existing methodologies frequently encounter limitations related to complex operation and high cost.To address the need for controllable,high-precision,and cost-efficient droplet splitting,this study combines three-dimensional printing technology with superhydrophobic surface modification to fabricate pyramid microstructures with customized splitting functionalities.The pyramidal sharp edges act as“fluidic blades”to split droplets through the synergistic interaction of edge-induced capillary forces and inertial forces generated at the liquid film periphery during spreading dynamics.Upon penetration by the pyramid apex,the droplet forms an annular liquid ring that subsequently fragments into sub-droplets,enabling programmable splitting.A comprehensive experimental and computational framework was developed to investigate splitting dynamics,force distribution pat-terns,and geometric dependence of pyramid structures on splitting performance.Results indicate that increased Weber numbers,larger droplet volumes,and reduced pyramid apex angles markedly improve splitting controllability.Additionally,six-and 12-sided pyramid-based splitting/collection devices were engineered to demonstrate practical implementations,including on-demand droplet splitting and liquid marble synthesis.This work establishes a scalable,low-cost platform for precision droplet manipulation with significant implications for microfluidic devices and lab-on-a-chip technologies.
