Long-afterglow fluorescent powder applied to LED and preparation method of long-afterglow fluorescent powder
A long afterglow phosphor and wavelength technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem that yellow powder does not have long afterglow characteristics, and achieve the effects of stable and reliable product quality, compensation for light loss, and long afterglow time.
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[0044] The invention also provides a preparation method of the long afterglow phosphor applied to LED. The preparation method comprises the following steps:
[0045] S1, providing raw materials and grinding and mixing to obtain a mixture;
[0046] S2, in an oxygen atmosphere, sintering the mixture for the first time to obtain a first sintered body, and grinding the first sintered body into a prefabricated powder;
[0047] S3, in a reducing atmosphere, sintering the prefabricated powder for a second time to obtain a second sintered body;
[0048] S4, grinding the second sintered body to obtain a long-lasting phosphor.
[0049] In step S1, according to (A 1-x B x ) m-y C y (D 1-z E. z ) 8-m o 12 The stoichiometric ratio of the reaction raw materials was weighed. Commercially available micron or nanometer raw materials with a purity of more than 99% can be used without further processing of the raw materials, which can save costs and facilitate industrialization.
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Embodiment 1
[0062] The general chemical formula of the long afterglow phosphor is Gd 2.98 Ce 0.02 Al 2 Ga 3 o 12 , that is, x=0, y=0.02, z=0.4, m=3, A is Gd, C is Ce, D is Ga, and E is Al.
[0063] The preparation method of the long afterglow phosphor is as follows:
[0064] Commercially available high-purity (99%) Gd 2 o 3 、Ce 2 (CO 3 ) 3 、Al 2 o 3 , Ga 2 o 3 As the starting raw material, accurately weigh the mass of each oxide or carbonate according to the above formula, mix and grind the weighed reaction raw materials in an agate mortar to obtain a mixture.
[0065] Put the mixture into a high-purity corundum crucible, in O 2 Under the atmosphere, sintering was performed in a tube furnace at 1400° C. for 4 hours to obtain a first sintered body. After cooling down to room temperature with the furnace, the obtained first sintered body is ground to obtain a prefabricated powder.
[0066] Add the prefabricated powder to 5% H by volume fraction 2 with a volume fraction of 9...
Embodiment 2
[0069] The general chemical formula of the long afterglow phosphor is Gd 2.98 Ce 0.02 Al 2 Ga 3 o 12 , that is, x=0, y=0.02, z=0.4, m=3, A is Gd, C is Ce, D is Ga, and E is Al.
[0070] The preparation method of the long-lasting phosphor is basically the same as that of Example 1, except that the temperature for the second sintering is 1400°C.
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