Green fluorescent material and preparation method thereof

Abstract

The invention relates to a green fluorescent material and a preparation method thereof. A chemical expression of the green fluorescent material is Zn1-xB2O4:xMn<2+>, wherein x is greater than 0 but issmaller than or equal to 0.3. The green fluorescent material has the advantages that bright green light can be given out under the irradiation of near ultraviolet to blue light; particularly the green fluorescent material has high absorption performance in a blue light region; the material can be effectively excited by a blue light chip; preparation raw materials are cheap and can be easily obtained; no pollution exists; the preparation method is simple and mild; the production cost is low, and the like. The preparation method is suitable for large-scale industrial production. On the basis ofthe various advantages above, large-scale industrial production of the green fluorescent material can be realized; the green fluorescent material can be widely applied to the aspects of illumination,display and the like.

Description

technical field [0001] The invention relates to the technical field of fluorescent materials, in particular to a green fluorescent material and a preparation method thereof. Background technique [0002] Fluorescent material is a kind of photoluminescent material. By absorbing light of a certain wavelength from the outside, it immediately emits light of different wavelengths to the outside world. When the incident light stops irradiating, the emitted light stops immediately. Fluorescent materials are widely used. In addition to being used as dyes, they are also used in organic pigments, optical brighteners, photooxidants, coatings, chemical and biochemical analysis, solar collectors, anti-counterfeiting marks, drug tracers and lasers. wider application. Especially in white LEDs which are now widely used as lighting, fluorescent materials play a pivotal role. [0003] In recent years, with the rapid development of fluorescent materials for white LEDs in basic research and p...

AI Technical Summary

Problems solved by technology

However, the existing fluorescent materials basically cannot meet the above requirements at the same time, so there are not many fluorescent materials that can be really applied in daily life.

[0004] For example, most common green phosphors are made of doped rare earth element Tb 3+ 、Ce 3+ 、Eu 2+ Most of these phosphors require expensive rare earths as raw materials, and the cost is high

In addition to the high cost, (1) Tb-doped 3+ Although the fluorescent powder has high color purity, its absorption is low, the excitation spectrum is too narrow and it is not easy to excite in the deep ultraviolet region, so it cannot be widely used in daily life.

(2) Currently commercially available green phosphor (BaSr) 2 SiO 4 : Eu 2+ , has strong absorption in the near-ultraviolet to blue light region, but its emission spectrum is too broad and its color purity is low, which limits its wide application. In addition, its poor thermal stability has become a short board for its application.

(3) β-SiAlON: Eu 2+ Relative to (BaSr) 2 SiO 4 : Eu 2+ It has strong chemical and thermal stability and a wider excitation spectrum, but the ultra-high sintering temperature (1800-2000°C) and harsh preparation conditions (higher pressure) increase its production cost, which in turn limits its application. widely used, and β-SiAlON:Eu 2+ The patent of the phosphor is owned by the Japanese National Institute of Materials Science, US Patent No.: US6632379

[0005] For another example, the patent "Red and Green Fluorosulfide Fluorescent Materials, Preparation Method and White Light Emitting Diode Device" (Application No. 201110033203.7) discloses a series of rare earth-doped fluorosulfide fluorescent materials, but these fluorescent materials contain The elements fluorine and sulfur harmful to the human body and the environment are not environmentally friendly, and a large amount of expensive rare earths are used and the cost is high, so it is not conducive to popularization and application; the patent "a nitride fluorescent material that emits green light under blue light excitation and its preparation Methods and Applications" (application number 201510380431.X) discloses a Eu 2+ Doped nitride green phosphor, the preparation method adopts high-temperature solid-phase method, which requires high preparation temperature and relatively expensive nitride raw materials, which makes the preparation cost high and the preparation conditions are harsh, which is not conducive to large-scale application

Images