To improve the stability and luminescence properties of CsPbBr3 QDs, we proposed a new core-shell structure for CsPbBr3/CdSe/Al quantum dots (QDs). Using a simple method of ion layer adsorption and a reaction method, CdSe and Al were respectively packaged on the surface of CsPbBr3 QDs to form the core-shell CsPbBr3/CdSe/Al QDs. After one week in a natural environment, the photoluminescence quantum yields of CsPbBr3/CdSe/Al QDs were greater than 80%, and the PL intensity remained at 71% of the original intensity. Furthermore, the CsPbBr3/CdSe/Al QDs were used as green emitters for white light-emitting diodes (LEDs), with the LEDs spectrum covering 129% of the National Television System Committee (NTSC) standard color gamut. The core-shell structure of QDs can effectively improve the stability of CsPbBr3 QDs, which has promising prospects in optoelectronic devices.

Abstract:In order to research the sensing characteristics of polymer optical waveguide. In this paper, the theoretical model of transmission of three-layer polymer planar optical waveguide was established based on coupled-mode theory. The working principle of optical waveguide biosensor was investigated. The article also researched the relationship between an optical guide's physical parameters and surface sensitivity and improved on the sensitivity calculation method of composite optical guide sensing components. This paper then goes on to establish a sensitivity analysis method for disappeared wave type sensing components. Based on this, the article has developed sensitivity calculation software for high sensitivity optical guide sensing components and improved film refraction rate of the method for sensitivity calculation.