Technical Support - JiNan Vican

Mechanism of photochromism

It was mentioned earlier that there are two independent chromophores in fulgide molecules. Kurita et al. studied the excited state characteristics of phenyl-substituted fulgide, and found that when fulgide molecules were excited by ultraviolet light, only excited singlets were generated, and some fluorescence of fulgide could be observed at low temperature. The existence of (n, r ") excited singlet was further confirmed in nanosecond laser flash photolysis experiment, and no evidence of excited triplet was observed, and oxygen had...

Friday April 3rd, 2026Technical SupportRead more...

Several ways of molecular excitation

(1) Thermal excitation to excite electrons in normal state molecules requires a large amount of energy, which can only be achieved in flames and high-temperature furnaces. The energy required to excite molecular vibrations is much smaller, but only a certain proportion of molecular vibrations in heated gases are excited. In normal temperature gases, molecules are in rotation, and the energy required to excite molecular rotation is even smaller. The characteristic of thermal excitation is that the number of molecules...

Thursday February 26th, 2026Other Articles, Technical SupportRead more...

Characteristics of plastic luminous agent

The remarkable characteristics of metal sulfide system are rich luminescent colors, which can cover the luminescent region from blue to red; The disadvantage is that Unstable chemical properties, low luminous intensity and short time. The characteristics of rare earth aluminate luminous agents are as follows ① High luminous efficiency. Aluminate luminous agents have high quantum efficiency in visible light region, and are used in plastics. The amount is small, which is beneficial to reducing the manufacturing cost of luminous plastics. ② Long luminous time....

Tuesday September 9th, 2025Technical SupportRead more...

Manufacture of polymer cement long afterglow luminescent coating

(1) adding polyacrylate emulsion with core-shell structure, emulsifier, defoamer, film former, thickener and dispersant in sequence, mixing, filtering, weighing and packaging to obtain liquid material. (2) mixing luminescent powder, white cement and filler, weighing and packaging to obtain powder. (3) At the site where luminous paint needs to be painted, the liquid material and powder are mixed evenly according to a certain proportion, and then can be painted for use. [Characteristics] As the basic branch of cryology, core-shell polyacrylate emulsion has reduced...

Tuesday August 5th, 2025Technical SupportRead more...

Preparation of inorganic fluorescent materials

Yu Lanping [80] summarized the preparation methods of inorganic fluorescent materials into the following eight kinds. (1) High-temperature solid-state method-High-temperature solid-state method is a traditional preparation method of inorganic fluorescent materials. Uniformly mixing the luminescent matrix and the activator according to a certain proportion, burning at 1000-1500℃ for several hours in a reducing atmosphere, cooling and pulverizing to obtain the finished product. For example, Zns :Cu=9911 is mixed, burned at 1300℃ for 10h, cooled and crushed to obtain fluorescent pigment...

Saturday June 14th, 2025Technical SupportRead more...

What is the action mechanism of plastic luminous agent?

The reason why plastic luminous agent can store light energy in plastic material after receiving sunlight or other illumination and can automatically emit light in the dark is related to its special structure and composition. Although there are many types of plastic luminous agents, their luminous process is basically the same, which consists of three steps: (1) the matrix lattice absorbs excitation energy; The matrix lattice transfers the absorbed excitation energy to the activated ions to excite them; The...

Monday April 14th, 2025Technical SupportRead more...

Generation and rate constant of phosphorescence

Phosphorescence is another important type of excited state radiation transition, which is the radiation released when excited state molecules lose their lives to low energy states with different multiplicity. Usually observed phosphorescence is the radiation released when the first excited triplet state (Ti) transits to the ground state (S) (Kasha rule). Generally, phosphorescence is much weaker than fluorescence, because the T-state emitting phosphorescence is usually not easy to directly absorb photons from the S-state, and the T-state is mainly formed...

Tuesday December 17th, 2024Technical SupportRead more...

Practice of polyester strontium aluminate long afterglow fluorescent coating

Raw material: unsaturated polyester resin Strontium aluminate phosphor Other additives solvent accelerating agent solidifying agent [Preparation method] Fluorescent powder, solvent and other additives are added to unsaturated polyester resin according to a certain proportion, which is stirred evenly for later use, and curing agent is added according to a certain proportion when the film is formed. [Characteristics ] The coating has high fluorescence efficiency and long aging, and has the advantages of good adhesion, high shear strength and so on. (1) The brightness of unsaturated polyester resin coating...

Sunday November 17th, 2024Technical SupportRead more...