Niobate red phosphor for white-light LEDs and preparation method thereof
A technology of red phosphor and niobate, applied in the optical field, can solve problems such as inability to achieve, and achieve the effects of low preparation cost, stable physical and chemical properties, and simple post-processing
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Embodiment 1
[0024] A kind of niobate red fluorescent powder for white light LED of this embodiment, the chemical formula of this red fluorescent powder is: Sr 3 La 0.6 Eu 0.4 Nb 3 o 12 . This embodiment prepares Sr 3 La 0.6 Eu 0.4 Nb 3 o 12 The specific steps of red phosphor powder are:
[0025] Place the required raw materials in an oven to fully dry, then weigh Eu 2 o 3 0.4027g, La 2 o 3 0.5593g, SrCO 3 2.5343g, Nb 2 o 5 2.2815g, Eu in the above raw materials 2 o 3 The purity is 99.99% (mass), and the rest are analytically pure. Mix and grind the above raw materials in an agate mortar evenly, place them in a muffle furnace, and sinter them in air at 800°C for 5 hours. After sintering for 6 hours and cooling to room temperature, the red phosphor with the above chemical expression is obtained.
[0026] For the niobate-based red phosphor powder prepared in this example, its XRD spectrum can be found in figure 1 . Depend on figure 1 It can be seen that the diffraction...
Embodiment 2
[0029] The chemical formula prepared in this embodiment is Sr 3 La 0.7 Eu 0.3 Nb 3 o 12 The red phosphor powder, the preparation method and the performance of the prepared red phosphor powder are basically the same as in Example 1, and the preparation process is now briefly described as follows:
[0030] Place the required raw materials in an oven to fully dry, then weigh Eu 2 o 3 0.3021g, La 2 o 3 0.6525g, SrCO 3 2.5343g, Nb 2 o 5 2.2815g, Eu in the above raw materials 2 o 3 The purity is 99.99% (mass), and the rest are analytically pure. Another weighed 0.5770gH 3 BO 3as a flux. Mix and grind the above raw materials in an agate mortar, add volatile solvent ethanol during the grinding process, wait for 1 hour after grinding, place in a corundum crucible, and sinter in air at 800 ° C for 5 hours, and the fired powder is again Grind until uniform, sinter in air at 1200°C for 6 hours, and cool to room temperature to obtain the red fluorescent powder with the abov...
Embodiment 3
[0032] The chemical formula prepared in this embodiment is Sr 3 La 0.8 Eu 0.2 Nb 3 o 12 The red phosphor powder, the preparation method and the performance of the prepared red phosphor powder are basically the same as in Example 1, and the preparation process is now briefly described as follows:
[0033] Place the required raw materials in an oven to fully dry, then weigh Eu 2 o 3 0.2014g, La 2 o 3 0.7457g, SrCO 3 2.5343g, Nb 2 o 5 2.2815g, Eu in the above raw materials 2 o 3 The purity is 99.99% (mass), and the rest are analytically pure. Weigh another 0.8644gLi 2 CO 3 as a flux. Mix and grind the above raw materials in an agate mortar, add volatile solvent acetone during the grinding process, wait for 1 hour after grinding, place in a corundum crucible, and sinter in air at 800°C for 5 hours, and the sintered powder is again Grind until uniform, sinter in the air at 1250° C. for 5 hours, and cool to room temperature to obtain the red phosphor with the above c...
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