Red fluorescent material capable of being excited by near-ultraviolet light, preparation method and application

Abstract

The invention discloses a red fluorescent material capable of being excited by near-ultraviolet light, a preparation method and application. A chemical formula is Ca[5-5x]Eu5xNb4Ti3O21, wherein x is a molar ratio as rare earth europium ion Eu<3+> substituting Ca (calcium) ion, and is greater than or equal to 0.0001 or smaller than or equal to 0.20. The red fluorescent material has the advantages that the red light with a peak value of about 615 nanometers can be transmitted in the near-ultraviolet area with exciting light of 350 to 420 nanometers, the chromaticity coordinate value of the light emitting is red light with x is equal to 0.625-0.655 and y is equal to 0.345-0.375, and the chromaticity is pure; the exciting wavelength is closely matched with near-ultraviolet semiconductor chips of InAlGaN, InGaAs and the like, and can be used as a deep red component in LED (light emitting diode) and WLED (white light emitting diode) of multi-primary color energy-saving fluorescent light sources, so as to modulate the color temperature of the light source and improve the color displaying index; a matrix is stable and can resist corrosion, the light emitting efficiency is high, and the toxicity and the harm are avoided. The preparation method has the advantages that the method is simple, the operation is easy, the requirement on production conditions and equipment is low, the cost is low, any pollution is avoided, and the preparation method is suitable for industrialized production.

Description

technical field [0001] The invention relates to a red fluorescent material that can be excited by near-ultraviolet light, a preparation method and an application, and belongs to the technical fields of luminescent materials and displays. Background technique [0002] White LED is an emerging green lighting technology with strong development potential. Compared with incandescent lamps and fluorescent lamps, white LEDs are more energy-saving: the energy consumption of white LEDs is only 1 / 8 of incandescent lamps and 1 / 2 of energy-saving lamps; long life: more than 100,000 hours; can work at high speed: energy-saving lamps If the filament is turned on or off frequently, it will turn black and break down quickly; environmental protection: waste can be recycled without pollution; easy to prepare: solid-state package, not afraid of vibration, basically no need to consider heat dissipation, etc. The white LEDs currently used are mainly composed of blue LEDs and YAG phosphors to fo...

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Problems solved by technology

[0003] On the other hand, although some red phosphors have been developed, most of them are excited under ultraviolet light (less than 365 nanometers), which does not match the blue light chip (the excitation area is generally 380-470 nanometers), so it cannot stably meet the needs of WLEDs. Therefore, there are relatively few red phosphors that can be effectively excited by near-ultraviolet light at this stage, and the stability and luminous efficiency are not high. In addition, ordinary phosphors will also produce toxic gases such as sulfide under ultraviolet radiation, which is harmful to The environment is harmful, and it is troublesome to make and the cost of the preparation process is relatively high.

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