Bivalence europium enabled alkaline earth metal silicate fluorescent powder and method of producing the same

Abstract

The invention discloses a making method of alkaline-earth metal silicate phosphor powder activated with bivalence europium and belongs to technical domain of rare-earth luminescent material, wherein the composition of the phosphor powder is SrxBayEuzSiO2+x+y+z (2<=x<5, 0<y<=0. 01, 0<z<=0. 15, 2. 5<=x+y+<=5 ), which is characterized by the following: the range of wavelength agitated with the phosphor powder is from ultraviolet light to blue light to blue-green light (lamda exc equals 300-500nm); the emitting peak wavelength is lamda em equals 565nm-586nm and the half depth-width of emission peak (FWHM) is within 70-90nm. The phosphor powder can be used for yellow or yellow-orange component of white light LED as displaying material emitted by ultraviolet purple light as well.

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...

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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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