The study of photochromic compounds as erasable optical storage materials is one of the hotspots in the field of photochromism in recent years. Hershberg was the first to propose that photochromic reactions constitute a memory model that could potentially be used for data storage. Heller et al. summarized… Read More »Optical information storage and photochromic materials

The research of organic photochromic chemistry and materials has been expanding and deepening in recent years. Organic photochromic substances can be roughly divided into the following categories according to their reaction types.

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