Red light fluorescent material and its preparation method, application, white light LED equipment
A technology of red light fluorescence and fluorescent materials, applied in the direction of luminescent materials, chemical instruments and methods, electrical components, etc., can solve the problems of restricting the development of white light LEDs and low luminous efficiency, and achieve improved performance, high luminous brightness, and high luminous efficiency Effect
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[0032] In the second aspect, an embodiment of the present invention provides a preparation method of a red fluorescent material, the preparation method comprising the following steps:
[0033] Step 1, preparation containing Ca 2+ , Mg 2+ 、Eu 3+ 、Pr 3+ and Si 4+ or W 6+ precursors of
[0034] Step 2, mixing the precursor with the flux and then calcining to obtain the red fluorescent material;
[0035] to Si 4+ or W 6+ The stoichiometric number is 1 meter, Ca 2+ , Mg 2+ 、Eu 3+ and Pr 3+ The stoichiometric ratio of is (1-x-y-z):x:y:z, wherein, 0
[0036] Eu 3+ and Pr 3+ Together as luminescent centers, Pr 3+ with Eu 3+ Energy transfer can be formed between them, which is helpful for the Eu 3+ the excitation. At the same time, Pr 3+ It can also emit red light when excited by near-ultraviolet light. Therefore, the obtained red fluorescent material has higher luminous efficiency and higher luminous brightness, which is beneficial to improving the perform...
Embodiment 1
[0057] This embodiment provides a red fluorescent material, the chemical formula of the red fluorescent material is: Ca 0.71 Mg 0.2 SiO 3 :0.08Eu 3+ ,0.01Pr 3+ .
[0058] The preparation method of the red fluorescent material is as follows:
[0059] Step 1: Accurately weigh europium oxide, praseodymium oxide, ethyl orthosilicate, calcium nitrate and magnesium nitrate according to the stoichiometric ratio shown in the above chemical formula.
[0060] Step 2, dissolving europium oxide and praseodymium oxide in concentrated nitric acid with a mass concentration of 65%, and then diluting the resulting solution with distilled water to obtain the first solution; adding tetraethyl orthosilicate to distilled water for hydrolysis reaction to obtain nano-silica The dispersion is the second solution.
[0061] Step 3, calcium nitrate, magnesium nitrate and the second solution are added to the first solution, and the third solution is obtained after uniform mixing.
[0062] Step 4, ...
Embodiment 2
[0065] This embodiment provides a red fluorescent material, the chemical formula of the red fluorescent material is: Ca 0.58 Mg 0.3 SiO 3 :0.1Eu 3+ ,0.02Pr 3+ .
[0066] The preparation method of the red fluorescent material is as follows:
[0067] Step 1: Accurately weigh europium oxide, praseodymium oxide, ethyl orthosilicate, calcium nitrate and magnesium nitrate according to the stoichiometric ratio shown in the above chemical formula.
[0068] Step 2, dissolving europium oxide and praseodymium oxide in concentrated nitric acid with a mass concentration of 65%, and then diluting the resulting solution with distilled water to obtain the first solution; adding tetraethyl orthosilicate to distilled water for hydrolysis to obtain nano-SiO 2 The dispersion is the second solution.
[0069] Step 3, calcium nitrate, magnesium nitrate and the second solution are added to the first solution, and the third solution is obtained after uniform mixing.
[0070] Step 4, slowly drop...
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