Boron aluminate-based blue fluorescent powder, preparation method and application

Abstract

The invention relates to boron aluminate-based blue fluorescent powder, a preparation method and an application, belonging to the technical field of inorganic luminous materials. The fluorescent powder is boron aluminate-based fluorescent powder activated by rare earth ions, the chemical formula is La1-xCexAl2B3O9, x represents the molar percent coefficient of Ce doped in a La position, x is not less than 0.005 and not more than 0.05, and the fluorescent powder is prepared by adopting a high-temperature solid phase method. The rare earth boron aluminate blue fluorescent powder provided by the invention can be effectively excited by ultraviolet light, the range of exciting light is 250-350nm, the emission wavelength is 350-500nm, the luminous intensity is high, the stability is good, and the rare earth boron aluminate blue fluorescent powder becomes an excellent blue component in high color rendering fluorescent powder and can be applied to lighting taking the ultraviolet light as an exciting source, and chromaticity regulation of display devices and photoluminescence. The sintering process of the fluorescent powder provided by the invention is simple, easy to operate and good in reproducibility, and the obtained product is stable in quality and suitable for industrial production.

Description

technical field [0001] The invention relates to an inorganic luminescent material, in particular to a fluorescent powder excited by ultraviolet light, a preparation method and an application thereof, and belongs to the technical field of rare earth luminescent materials. Background technique [0002] The successful development of high-brightness GaN blue light-emitting diodes and the resulting white LEDs are known as the biggest light source revolution since Edison invented the incandescent lamp. Because of its high photoelectric efficiency, long life, small size, low power, solid-state energy saving and green environmental protection, white LED products are attracting more and more attention. Energy-saving lighting is one of the main contents of low-carbon economy. Rare earth fluorescent materials are the key materials in energy-saving lamps and white LED lamps, which are of great significance for improving the performance indicators such as luminous efficiency, service li...

AI Technical Summary

Problems solved by technology

Such as commercial blue phosphor BaMgAl 10 o 17 :Eu 2+ , due to its low luminous efficiency, blue light is easily absorbed by red and green phosphors, etc., which affects the luminous performance of the three-color phosphor excited by ultraviolet-near ultraviolet, thereby reducing the performance of white LEDs; Chinese invention patent CN101497791A discloses a rare earth alumina Salt blue fluorescent powder and its preparation method and application, its chemical formula is Mg 1-x-y Sr y Al 2 o 4 :Eu x (where x is the number of moles of europium atoms, y is the number of moles of strontium atoms, 0.005≤x≤0.10, 0.01≤y≤0.14), the main emission peak of the fluorescence spectrum test is 463 nanometers, and the excitation center wavelength is 330 nanometers. Blue light, but the process involves pretreatment of raw materials, batching, sintering, washing, etc., and the preparation is relatively complicated; Chinese invention patent CN1605612A discloses a rare earth borate blue phosphor and its preparation method, and its molecular formula is (EuO) m (MO) n (B 2 o 3 ) p (MX 2 ) q (where M is one of Mg, Ca, Sr and Ba or a mixture thereof, X is one or a mixture of Cl, Br and I; m, n, q≥0), the phosphor can be excited by ultraviolet light, emit The main peak of the spectrum is between 430 and 460 nanometers, which emits relatively high-intensity blue light, but the phosphor has many components, and the final product will have a certain amount of impurities, and it also involves spray drying and other operations, which is not conducive to actual production; Another example is that the Chinese invention patent CN1190115A discloses BaMgAl 14 o 23 : The preparation method of Eu blue fluorescent powder is to directly cover the carbon powder on the raw material. In this preparation method, since the carbon powder is in direct contact with the raw material, it will cause some carbon pollution of the phosphor powder, thereby causing waste of raw materials in the preparation process.

Therefore, this preparation method cannot well meet the needs of actual production

Divalent europium ions are not easy to reduce fully, so this also limits its use as a luminescent center of blue phosphors

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