A kind of bismuth ion-activated titanium aluminate fluorescent powder and its preparation method and application

Abstract

The invention discloses bismuth ion activated titanium aluminate fluorescent powder as well as a preparation method and an application thereof. The chemical general formula of the fluorescent powder is Mg(3-x-y)BixNayTi3Al4O25, wherein the matrix is titanium aluminate, x is a doped molar ratio of an activator Bi<3+> ion, y is a doped molar ratio of a charge compensator Na<+> ion, x is more than orequal to 0.015 and less than or equal to 0.3, y is more than or equal to 0.015 and less than or equal to 0.3, and x is equal to y. The fluorescent powder is prepared by adopting a chemical sol-gel method, the sample emits green fluorescence of about 500nm under near ultraviolet excitation, and the fluorescence can be used for manufacturing a white LED device or a pure green LED light source excited by a near ultraviolet chip. The titanium aluminate fluorescent powder disclosed by the invention is simple in preparation and low in production cost.

Description

technical field [0001] The invention relates to the field of inorganic luminescent materials, in particular to a bismuth ion-activated titanium-aluminate fluorescent powder and a preparation method and application thereof. Background technique [0002] Light-emitting diode (LED) is an energy conversion device that can convert electrical energy into light energy. It is the fourth generation of green and environmentally friendly lighting sources after incandescent lamps, fluorescent lamps, and high-intensity discharge lamps. White LEDs are mainly composed of phosphors and diode chips that can provide excitation light. At present, there are three main assembly methods: one is to directly combine the blue LED chip with the yellow phosphor, and use the blue light of the chip to mix with the yellow light obtained by exciting the phosphor. Obtaining white light is the most commonly used method; the second is to combine the three primary color chips to obtain white light; the third ...

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Problems solved by technology

However, these substrates also have many shortcomings due to their own characteristics. For example, the chemical properties of sulfide-based phosphors are unstable, poor thermal stability, and relatively large light attenuation; borate phosphors have poor thermal stability and are easy to agglomerate, requiring additional post-treatment processes; The preparation of silicate-based phosphors requires high temperature, long holding time, high energy consumption, and strict requirements on equipment. Moreover, the obtained phosphor particles are relatively large, and the particle size is not uniformly dispersed. It needs to be ground and crushed to make the phosphors The crystallinity of the powder decreases, which affects the luminous performance; although the oxynitride phosphor has high luminous efficiency, its preparation conditions are harsh, the synthesis process is complicated, the requirements for equipment are high, and the production cost is relatively high.

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