Color is a substance that has a certain color in itself and can color other objects. According to the solubility in the solvent, the color can be divided into two categories of dyes and pigments, in the relevant literature, the two are often mixed as – talk. Both… Read More »Classification of fluorescent environmental Friendly colors
Photochromism refers to the phenomenon that when A compound (A) is irradiated by a certain wavelength of light, it can undergo a specific chemical reaction to obtain a product (B), which results in a significant change in its absorption harmonic due to a change in structure. Under the… Read More »Definition and System of Photochromism
Cohen et al. systematically studied the absorption spectra of salicylaldehyde aniline compounds, and found that some crystals of these compounds were photochromic and some were thermochromic. According to the spectral properties and crystal structure, they divided the crystals of these compounds into two categories.There are many differences between… Read More »relationship between crystal structure and photochromism and thermochromism
Up-conversion luminescent materials under the excitation of the pump light source will absorb the energy of the pump light source and convert the energy into light energy, and its conversion capacity is called luminous efficiency S.25]. Luminous efficiency is one of the reference bases to distinguish the quality… Read More »Factors affecting upconversion luminescence efficiency
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.
All color-changing pigments do not contain mercury, lead, chromium and other toxic heavy metals, and are non-toxic and non-irritating to human skin. However, because its particles are very small, after the formation of dust in the air, it is easy to enter the human lung by the respiratory… Read More »Safety and use precautions of thermochromic pigments
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