Luminescent carbon nano-dots are new types of nano-luminescent materials that have emerged in the past decade and have attracted widespread attention in the world. The bottleneck facing the development of this field is the lack of means to regulate the band gap of carbon nano-dots and the method of enhancing the quantum efficiency of fluorescence. At present, carbon nano-dots have achieved relatively efficient luminescence in the blue and green bands, but in the long wavelength band of the visible region, especially the orange to red band, there is a lack of high-efficiency luminescent carbon nano-dots.
Qu Songnan's research group further developed a method for regulating the luminescence band gap of carbon nano-dots. By regulating the degree of polycondensation of urea and citric acid assemblies, the solvothermal reaction of DMF as a solvent extends the absorption band of carbon nano-dots to green. In the optical band, by further metal cation passivation surface defect state treatment, the fluorescence quantum efficiency of the carbon nano-dots in the orange-red light band is as high as 46%. Researchers have combined the carbon nano-dots with starch to develop an orange-red phosphor based on carbon nano-dots, and to realize a warm white-light LED lighting device based on carbon nano-dots.
LED Business Network led to focus on e-commerce platform to promote led enterprises + Internet, the official website http://
FR-4 epoxy glass fiber cloth substrate is a kind of substrate with epoxy resin as the adhesive and electronic grade glass fiber cloth as the reinforcing material. Its adhesive sheet and inner core thin copper-clad board are important base materials for making multilayer printed circuit boards.
The epoxy glass fiber cloth substrate has higher mechanical properties, dimensional stability, impact resistance, and moisture resistance than paper substrates. Its electrical performance is excellent, its working temperature is high, and its performance is less affected by the environment. In terms of processing technology, it has great advantages over glass fiber cloth substrates made of other resins. This type of product is mainly used for double-sided PCBs and is used in large quantities.
Fr4 Pcb Material,Fr4 Circuit Board,Fr4 Pcb Board,Fr4 Printed Circuit Board
Chuangying Electronics Co.,Ltd , https://www.cwpcb.com