Main emission peak changeable and adjustable fluorescent material and preparation method thereof

Abstract

The invention discloses a main emission peak changeable and adjustable fluorescent material and a preparation method thereof and relates to a light-emitting diode (LED) illuminating / displaying fluorescent material and a preparation method thereof. The fluorescent material is an alkaline earth oxygen fluorine silicon aluminum acid salt fluorescent material. The chemical general formula is Mx-zY6-x-y-zAl11-xLxO25.5-0.5kFk: yCe3+, zMn2+, wherein Ce3+ and Mn2+ are luminescence center ions, the x is larger than or equal to 0 and smaller than or equal to 1.5, the y is larger than or equal to 0.01 and smaller than or equal to 0.16, the z is larger than or equal to 0 and smaller than or equal to 0.2, the k is larger than 0 and smaller than or equal to 0.01, M is Mg2+ or Ba2+, L is Si4+ or Zr4+, according to the chemical general formula, MgO, MgF2, Al2O3, AlF3, SiO2, ZrO2, BaF2, BaCO3, MnCO3 and CeO2 are mixed in a closed container to obtain a mixture, and the mixture is subjected to heat preservation in a reduction furnace of 1620 DEG C at H2 atmosphere, cooling, crushing, grading and sieving to obtain the alkaline earth oxygen fluorine silicon aluminum acid salt fluorescent material. According to the fluorescent material and the preparation method thereof, the main emission peak of green, yellow and orange is changeable and adjustable, the fluorescent material is used for white light LED illuminating / displaying, under the excitation of blue light LED, high luminous efficiency can be achieved, and the wavelength is in a range from 530nm to 585nm.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to a fluorescent material and a preparation method thereof in application fields such as LED lighting / display. Background technique [0002] White LED is a new solid-state green lighting technology with high efficiency, energy saving and environmental protection, and is known as the fourth generation lighting source in the 21st century. The realization scheme of white light LED mainly includes: 1) using red, green and blue three primary color chips to prepare high color rendering white light LED; 2) using InGaN blue light LED to excite YAG structure Y 3 Al 5 o 12 :Ce(YAG:Ce 3+ ) yellow phosphor powder; 3) using UV-LED to excite red, green and blue phosphor powder to prepare white LED with high color rendering property. Judging from the current development trend of white light LED lighting technology, the realization of white light LED is mainly based on ...

AI Technical Summary

Problems solved by technology

Although silicate phosphors (Sr, Ba) 2 SiO 4 :Eu 2+ It has the characteristics of adjustable emission main peak 515-570nm, but the silicate material system phosphor has the disadvantages of large light attenuation and low thermal stability, especially the red light part can only reach about 570nm, which is far from meeting the needs of improving white light. LED color rendering requirements

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