Green emitting phosphor powder capable of being excited by ultraviolet-blue ray light-emitting diode (LED) and preparation method thereof

Abstract

The invention belongs to the technical field of rare earth luminescent materials, in particular relates to green emitting phosphor powder capable of being excited by an ultraviolet-blue ray light-emitting diode (LED) and a preparation method thereof. A chemical molecular formula of the green emitting phosphor powder is (Al-xEux) (Sil-yBy)2O2N5, wherein the A is one or more of alkaline-earth metal elements, the B is one or more of aluminum (Al), gallium (Ga), indium (In), tantalum (Ta) and germanium (Ge), the X is greater than 0, and the Y is less than 1. The green emitting phosphor powder is prepared by adopting a high-temperature high-pressure solid phase synthesis method that nitrides of elements in the molecular formula or other compound or simple substance capable of producing the nitrides or oxides or other compound or simple substance capable of producing the oxides serve as original reactants, boric acid or a halide serves as cosolvent, and the weight of the cosolvent is 0.01%-25% of that of the original reactants. The firing is performed for 2-10 hours in reducing atmosphere and nitrogen under the atmospheric pressure of 0-200 at the temperature of 1500-2200 DEG C. The green emitting phosphor powder is obtained by smashing the firing product to 4-20 microns after cooling. The green emitting phosphor powder is packaged on an LED chip to be manufactured into various luminescent devices.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a nitride fluorescent powder and a preparation method thereof. Background technique [0002] Light Emitting Diode (Light Emitting Diode) is an energy conversion device that can convert electrical energy into light energy. It has low operating voltage, low power consumption, stable performance, long life, strong impact resistance, vibration resistance, light weight, It has the advantages of small size, low cost, and fast luminous response. Therefore, it is widely used in display devices and short-distance, low-speed optical fiber communication light sources. Especially in recent years, the rapid development of blue, purple and ultraviolet LEDs has made it possible for LEDs to replace incandescent and fluorescent lamps in the lighting field. Among the several main methods of preparing white LEDs, relatively speaking, the method of mixing blue l...

AI Technical Summary

Problems solved by technology

Among the several main methods of preparing white LEDs, relatively speaking, the method of mixing blue light and yellow light to obtain white light by coating yellow phosphor on the blue LED chip has the advantages of simple structure, good color rendering, blue LED chip and Yellow phosphor (YAG) is relatively mature, so it is currently the most widely used method for manufacturing white LEDs. However, efficient and stable green phosphors are still lacking.

Silicate green phosphors are usually used, but this kind of phosphors decomposes with water, has a low quenching temperature, and has a short lifespan. It is not suitable for green phosphors excited by LEDs in the field of general lighting and backlights.

Images