In the magic show, the magician left and right hands each hold a black plum poker, two cards gently touch, the magician blew a “fairy”, the original plum pattern instantly became a heart pattern. The color of playing cards in magic is varied, but the illusion or technique… Read More »“Magic dye” that changes color at will
The up-conversion luminescence process is an Anti-Stokes process, in which the luminescent ions emit short waves (visible light) by absorbing multiple long waves (infrared light). Upconversion luminescence mechanisms include excited state absorption (ESA), energy transfer (ET), cross relaxation (CR), co-sensitization (CSU) and photon avalanche (PA). The up-conversion luminescence… Read More »Upconversion luminescence process and luminescence mechanism
Under the action of an external excitation source, the phenomenon that a substance or a system has a significant change in color is called chromatism. Discoloration can be observed in gases, liquids or solids. External excitation sources can be light, heat, electricity and pressure.Let’s start with photochromic materials.… Read More »A series of questions about color change materials