Ultra-wide white fluorescent material, preparation method and application of ultra-wide white fluorescent material and lighting appliance

Abstract

The invention belongs to the field of fluorescent materials, and particularly relates to an ultra-wide white fluorescent material, a preparation method and application of the ultra-wide white fluorescent material and a lighting appliance. The ultraviolet excited ultra-wide white light luminescent material is formed by solid solution of activator Eu in Sr2-x-yCaxBayAl1+zSi2-zN1-zO6+z, and the chemical formula of the ultra-wide white light luminescent material is Sr2-x-y-aCaxBayAl1+zSi2-zN1-zO6+z: Eua, specifically, x is greater than or equal to zero but less than two, y is greater than or equalto zero but less than two, x+y is greater than or equal to zero but less than two, z is greater than or equal to negative one but less than or equal to one, and a is greater than or equal to zero butless than or equal to 0.2. The ultraviolet excited ultra-wide white light luminescent material prepared by the preparation method has a wider emission spectrum with good spectral controllability andwithout generating obvious color drift along with temperature change, both due to the fact that the luminescence is from single Eu2+; and the color characteristic can be obviously improved when the ultra-wide white light luminescent material is applied to the fields of white light LED illuminators and the like to achieve a high-quality healthy white light source. In addition, the solid-phase sintering preparation method of the ultraviolet excited ultra-wide white light luminescent material has the advantages of lower synthesis temperature, simple operation and easy batch production.

Description

technical field

[0001] The invention belongs to the field of fluorescent materials, and in particular relates to an ultra-wide white fluorescent material, a preparation method and application thereof, and a lighting appliance. Background technique

[0002] White LEDs (Light-emitting diodes) have a market share of more than 70% in the global lighting market due to their advantages of high efficiency, energy saving, environmental protection, long life, small size, fast response, high reliability and no radiation. At present, blue LED chips combined with yellow phosphors, or a mixture of green and red phosphors are often used in the market to package white LEDs. However, due to the shortcomings of "blue light peak" (narrow-band emission of blue LED) and "cyan gap" (gap between blue LED and phosphor emission spectrum) in the white light spectrum produced by this scheme, the light source has blue light hazards, uncomfortable Glare and lower color rendering index.

[0003] In or...

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