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

Abstract

The invention discloses europium ion activated titanium aluminate fluorescent powder as well as a preparation method and application thereof. A general chemical formula of the fluorescent powder is Mg2.4Bi0.3-xEuxNa0.3Al4Ti3O25, wherein a matrix is titanium aluminate, Eu<3+> ions are an activator, Bi<3+> ions are a sensitizer, Na<+> ions are a charge compensator, and x is a doped molar ratio of the Eu<3+> ions and is larger than or equal to 0.003 and smaller than or equal to 0.15. The fluorescent powder is prepared by adopting a chemical sol-gel method, a sample emits red fluorescence with a dominant wavelength of 311-604 nanometers under the activation of near-ultraviolet light and can be used for preparing a white-light LED device or a pure red LED light source activated with a near-ultraviolet chip. By taking the titanium aluminate fluorescent powder as a pure phase, the europium ion activated titanium aluminate fluorescent powder is simple to prepare and low in production cost.

Description

technical field [0001] The invention relates to the field of inorganic luminescent materials, in particular to a europium 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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