A kind of nitrogen oxide orange-red fluorescent powder for white light LED and preparation method thereof

Abstract

The invention discloses a nitric oxide orange red fluorescent powder for a white LED (light-emitting diode) and a preparation method thereof. The chemical expression formula of the fluorescent powder is as follows: Sr3-xB3N3O3:xEu<2+>, wherein in the formula, x is equal to 0.001-0.10. The preparation method comprises the following steps: adding a fluxing agent into raw materials such as carbonate, nitride, oxide of elements in the chemical expression formula and the like, grinding and evenly mixing so as to obtain a mixture; and then sintering the mixture for 3-7 hours at the temperature of 1400-1600 DEG C at the reduction atmosphere so as to obtain the orange red fluorescent powder for the LED. The obtained orange red fluorescent powder emits orange red light under the excitation of an ultraviolet light, purple light or blue light chip, and the emission peak value is located near the wavelength of 610 nm. The fluorescent powder has good chemical stability and wide excitation band, the excitation band of the fluorescent powder can cover ultraviolet light, purple light and blue light regions, and the fluorescent powder can be used as a red fluorescent powder for a near ultraviolet or blue LED.

Description

technical field [0001] The invention relates to the technical field of rare earth luminescent materials, in particular to a nitrogen oxide orange-red fluorescent powder for white LEDs and a manufacturing method thereof. Background technique [0002] White LED is a solid-state semiconductor device that converts electrical energy into white light, also known as semiconductor lighting. It has many advantages such as high efficiency, small size, long life, safety, low voltage, energy saving, and environmental protection. , Fluorescent lamps, and high-pressure gas discharge lamps are the fourth generation of lighting sources, which will be the mainstream products in the future lighting market. [0003] At present, there are various white light LED preparation methods, among which the combination of blue LED chip and yellow fluorescent material, combination of blue LED chip and red and green fluorescent material, and combination of purple LED chip and trichromatic fluorescent mate...

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Problems solved by technology

Sulfides such as (Ca 1-x Sr x )S: Eu 2+ Red fluorescent material, but the sulfide is unstable, easy to decompose at high temperature, produce toxic substances, the white light LED prepared has a short life, and does not meet environmental protection requirements

Nitride such as Sr 2 Si 5 N 8 : Eu 2+ Such as red fluorescent materials (see US Patent US 6649946), these materials have good fluorescent properties, but the alkaline earth metal nitrides in the raw materials are easy to react with air and water vapor, the preparation process is complicated, and the purity of the obtained powder is low. mass production

Silicates such as Sr 3 SiO 5 Yellow or orange-yellow fluorescent powder (see US Patent US20070029526A1), although this type of fluorescent material has good chemical stability and thermal stability, and the raw material of high-purity silica is cheap and easy to obtain, and the calcination temperature is lower than that of aluminate system and other characteristics, but it cannot be effectively excited by the blue light chip, and the emission wavelength peak is in the yellow light region

Phosphates such as Ca 4 (PO 4 ) 2 O: Eu 2+ Red phosphor (see Chinese patent ZL 200710055669.0), although its blue light chip is effectively excited, and the emission wavelength peak is in the red light region, but the luminous efficiency of the phosphate phosphor is low and the thermal stability is poor

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