White luminous emission fluorescent powder of alkali metal phosphosilicate and preparation method thereof
A phosphosilicate and alkaline earth metal technology, which is applied in the field of alkaline earth metal phosphosilicate single-matrix white light-emitting phosphors and their preparation, can solve the problems of ratio regulation, different aging rates, effects of lumen efficiency and color rendering index, Color reabsorption, etc.
Inactive Publication Date: 2008-10-15
FUDAN UNIV +1
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Problems solved by technology
Due to the problems of color reabsorption, energy loss, ratio control and aging rate between the mixtures, the lumen efficiency and color rendering index are greatly affected
Method used
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[0020] In order to ensure the accuracy, the reagents used were first processed in an oven at 120°C for 8 hours. Weigh the required amount of reagent and flux according to the chemical formula, add a little absolute ethanol, and grind it in a mortar for 3 hours to make it fully mixed. It was then dried and filled into corundum crucibles and compacted. Sinter in air at 800°C and 1350°C for 2 hours and 3 hours respectively in a sintering furnace, and then at 1300°C H 2 / N 2 In reducing atmosphere (H 2 Accounting for 10%) reduction for 3-5 hours. After cooling down to room temperature in a reducing atmosphere, take it out from the high-temperature furnace, crush, wash, and bake to obtain the desired product.
[0021] Prepared using the method described above and has the formula Ba 5.9 Ca(PO 4 ) 2 (SiO 4 ) 2 :Eu 0.06 mn 0.04 The excitation spectrum of the phosphor is as Figure 1 Show. It can be seen from the figure that the powder has a wide and strong excitation spec...
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Abstract
The invention belongs to the rare earth luminescent material technical field, and in particular relates to alkaline earth metal phosphosilicate white light-emitting phosphor and a method for making the same. The composition of the phosphor is expressed as BaaSrbCac(PO4)x(SiO4)y:Eud, Mne, wherein a is more than or equal to 3.9 and less than 9; b is more than or equal to 0 and less than or equal to 3; c is more than 0.1 and less than or equal to 1; d is more than 0.01 and less than or equal to 0.1; e is more than 0.01 and less than or equal to 0.1; x is more than 1 and less than or equal to 4; y is more than or equal to 0.1 and less than or equal to 2. Along with the change of composition, the excitation wavelength range of the phosphor is ultraviolet or purple light (lambda exc=300-410 nm). The phosphor emits white light under 365 nm excitation; the color temperature of the white light can be adjusted between 4000 and 10000 K, and the color rendering index Ra is between 78 and 88. The phosphor can be used as a single-matrix luminescent material for white LED excited by ultraviolet purple light chips.
Description
technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, in particular to an alkaline earth metal phosphosilicate single-matrix white light-emitting fluorescent powder co-activated by divalent europium and divalent manganese and a preparation method thereof. Background technique [0002] Compared with traditional lighting sources, white LED (light-emitting diode) has the advantages of energy saving, high efficiency, small size, long life, fast response, low driving voltage, and anti-vibration, and has attracted widespread attention from all over the world. From a technical point of view, there are two ways to get a white LED light source. One is to combine red, green, and blue monochromatic LEDs to produce white light; the second is to use LEDs to excite other luminescent materials to form white light, that is, use blue LEDs with yellow-emitting phosphors, or use near-ultraviolet LEDs To excite red, green and blue phosphors. ...
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IPC IPC(8): C09K11/81
CPCY02B20/181Y02B20/00
Inventor 闫世润胡学芳杨浩万国江胡建国马林
Owner FUDAN UNIV