Rare earth phosphate-based orange red fluorescent powder and preparation method thereof

Abstract

The invention relates to rare earth phosphate-based orange red fluorescent powder and a preparation method thereof, the chemical formula of the rare earth phosphate-based orange red fluorescent powderis RbSrGd1-xEux(PO4)2, and x is equal to 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14 and 0.15. The preparation method comprises the following steps: weighing rubidium chloride, strontium carbonate, gadolinium oxide, europium oxide and diammonium hydrogen phosphate; wherein the mass ratio of rubidium chloride to strontium carbonate to gadolinium oxide to europium oxide to diammonium hydrogen phosphateis 19:19:9.5(1-x):9.5x:38, wherein x is equal to 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14 or 0.15, performing grinding and uniform mixing, performing heating to 970-990 DEG C in a box-type resistancefurnace in an air atmosphere, performing heat preservation for 6-10h, performing furnace cooling to room temperature, taking out the product, and performing grinding to obtain a finished product. Thepreparation method is simple, the preparation temperature is low, the emission intensity is high, the performance is stable, Eu<3+> is used as a main activating agent, the excitable light wavelength range is wide, the excitable light wavelength range can be effectively excited by near ultraviolet light or blue light emitted by a semiconductor LED chip, sharp spectral line emission is presented, and the material belongs to an orange red light range. The fluorescent powder can emit bright orange red light under the excitation of light with the wavelength of 393 nm.

Description

technical field [0001] The invention belongs to the technical field of fluorescent materials for light-emitting diodes, and in particular relates to a rare-earth phosphate-based orange-red fluorescent powder, and also relates to a preparation method of the fluorescent powder. Background technique [0002] In recent years, light-emitting diodes (LEDs) are considered to be able to replace traditional incandescent lamps due to their advantages such as low power consumption, energy saving and environmental protection, resistance to harsh environments, long service life, high luminous efficiency, fast response speed, small size, and long viewing distance. A new generation of green lighting sources for lamps and mercury-containing fluorescent lamps. The mainstream LED light source in today's market is fluorescent conversion white light LED. This way of using fluorescent material and LED chip to form a device to achieve white light mainly includes: blue LED+yellow fluorescent mater...

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Problems solved by technology

[0003] But Eu 3+ Doped RbSrGd(PO 4 ) 2 The phosphor has not been reported before, and the phosphor can emit bright orange-red light under the excitation of 393 nm wavelength light

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