Articles

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...

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...

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...

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...

What are the preparation methods of luminous plastics?

The preparation of luminous plastics usually varies according to the addition method of luminous agent and the production process of plastic products or materials. The main methods are direct addition, masterbatch addition and in-situ polymerization addition. ① Direct Addition Method Direct addition method is the simplest method. The plastic luminous agent powder is directly mixed with the resin. In order to mix and disperse evenly, it is best to mix with the powdered resin. For example, when the resin is polypropylene...