Eu<3+>-activated red transparent fluorescent ceramic and preparation method thereof

Abstract

The invention provides a Eu<3+>-activated red transparent fluorescent ceramic and a preparation method thereof. The molecular formula of the fluorescent ceramic is (Y<0.3-x-y>Lu<0.7>)<2>O<3>: xSm<3+>, yEu<3+>, wherein x and y are respectively mole percents, x is more than or equal to 0.005 and less than or equal to 0.03, and y is more than or equal to 0.05 and less than or equal to 0.15. The preparation method comprises the following steps: with Y2O3, Lu2O3 and Eu2O3 as raw materials, weighing the raw materials, TeO2 and Sm2O3, conducting blending, adding absolute ethyl alcohol, and carrying out ball milling; drying ball-milled powder in a drying oven at 70-90 DEG C for 10-16 hours, and then conducting calcining at 700-900 DEG C for 3-6 hours; performing sieving with a 200-mesh sieve, carrying out dry pressing to obtain a green body, placing the green body in a high-temperature vacuum sintering furnace, and sintering the green body at 1200-1350 DEG C for 8-10 hours; and performing double-sided polishing treatment after annealing. The method is easy to realize accurate tuning of a spectrum, and the prepared ceramic has the advantages of obvious excitation spectrum broadening, low sintering temperature, high thermal conductivity and the like.

Description

technical field [0001] The invention relates to the technical field of fluorescent ceramic materials, in particular to a Eu 3+ Activated red transparent fluorescent ceramic and preparation method thereof. Background technique [0002] At present, the mainstream packaging method of white light LED needs to disperse phosphor powder in packaging materials such as organic resin and silica gel. With the continuous increase of people's demand for lighting, the energy flux density of the excitation source and the heat generated continue to increase, combined with the heat generated by the conversion process of the phosphor itself, resulting in the aging of the packaging material under long-term working conditions, which eventually leads to white LEDs. The efficiency of the device decreases, the quality of light decreases and its lifetime is shortened. Compared with the above-mentioned packaging materials, fluorescent ceramics stand out among many inorganic fluorescent conversion ...

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Problems solved by technology

[0003] In adopting Y 2 o 3 In terms of preparing red fluorescent ceramics as a matrix material, the patent publication number CN108753296A discloses a red light-emitting material that can be excited by a near-ultraviolet or blue light chip and its preparation method and application. The general structural formula of this material is (RE 1-x-y-z-m La m Zr y Mg z ) 2 o 3 :xEu, 0.01≤x≤0.2, 0.001≤y≤0.2, 0≤z≤0.1, 0≤m≤0.2, where RE=Lu 1-p-r Y p Gd r , 0≤p<1, 0≤r<1, but this material has many kinds of raw materials and strict requirements on component content, it is difficult to achieve accurate tuning of the spectrum, and there are problems such as insignificant excitation spectrum broadening, high sintering temperature, and low thermal conductivity. However, it cannot satisfy the preparation of low-temperature and high-efficiency red-light transparent ceramics, especially its application in high-power LED / LDs devices

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