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Alkaline earth metal silicate phosphor activated by divalent europium and preparation method thereof

An alkaline earth metal and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of different temperature characteristics and light maintenance characteristics, and high circuit design requirements

Inactive Publication Date: 2011-12-14
FUDAN UNIV +1
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Problems solved by technology

The first method combines red, green and blue single-color LEDs to produce white light, which has the advantages of high efficiency, dynamic adjustment of color temperature, and good color rendering. However, the forward voltage and light output of the three color LEDs are different, and their temperature characteristics are different. It is also different from the light maintenance characteristic. It must have the light output signal sampling and feedback function, and perform dynamic control so that the coordinates of the chromaticity point of the emitted white light remain unchanged, so the requirements for circuit design are relatively high.

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  • Alkaline earth metal silicate phosphor activated by divalent europium and preparation method thereof
  • Alkaline earth metal silicate phosphor activated by divalent europium and preparation method thereof

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Embodiment

[0016] 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 high-purity reagents strontium carbonate (SrCO3), barium carbonate (BaCO3), silicon dioxide (SiO2), and europium trioxide (Eu2O3) according to the chemical formula. Wherein, the mole fraction of Eu in the cations is between 0.02-0.2, more preferably between 0.05-0.15. Then weigh the flux that accounts for 0.5% to 5% of the mass of the chemical formula, preferably 2 to 3% of the mass of the chemical formula. Grind them with a little ethanol in a mortar for 2 to 3 hours, and mix them well. And flux and add a little absolute ethanol, grind in a mortar for 3 hours, make it fully mixed. It was then dried and filled into corundum crucibles and compacted. By means of temperature programming, the H 2 / N 2 In reducing atmosphere (H 2 accounted for 10%) and sintered at 800°C and 1350°C for 0.5 hours and 6 hours, respectively. After cooling d...

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Abstract

The invention belongs to the technical field of rare earth luminescent materials, in particular to an alkaline earth metal silicate fluorescent powder activated by divalent europium and a preparation method thereof. The composition of the phosphor is: SrxBayEuzSiO2+x+y+z, where 2≤x<5, 0

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a europium-activated alkaline earth metal silicate non-integral compound fluorescent powder and a preparation method thereof. Background technique [0002] Compared with traditional lighting sources, white light-emitting diodes (LEDs) have the advantages of energy saving, high efficiency, small size, long life, fast response, low driving voltage, and anti-vibration, and have 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 LED chips to excite other luminescent materials to form white light, that is, use blue LEDs to excite yellow-emitting phosphors, or use near-ultraviolet LED to excite red, green and blue phosphors. The first method combines red, gre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/79
Inventor 闫世润胡建国马林徐永刚郭恩梨
Owner FUDAN UNIV
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