Red fluorescent powder and preparation method thereof

Abstract

The invention discloses a red fluorescent powder and a preparation method thereof. The chemical composition formula is SrBi2(1-x)Eu2xTeO7, wherein x is mole percent of the doping element Eu relative to the Bi element, and x is greater than or equal to 0.01 and smaller than or equal to 0.90. The preparation method comprises the following steps: by using strontium oxide or carbonate as the raw material of strontium element, bismuth oxide or nitrate as the raw material of bismuth element, tellurium dioxide or tellurium trioxide as the raw material of tellurium element and europium oxide or nitrate as the raw material of europium element, mixing and grinding in an agate mortar to obtain an initial mixture, sintering at 800-900 DEG C in an air atmosphere for 2-8 hours, and grinding to obtain the product. The luminescent material can effectively absorb ultraviolet light and blue light within the range of 300-500nm; the generated main emission peak is 617nm red light emission; and the fluorescent powder has the advantages of high luminescent intensity, high color purity and favorable color coordinates, and is suitable to be used as the red light part of the luminescent material for LED (light-emitting diode).

Description

technical field [0001] The invention belongs to the technical field of LED fluorescent powder, and in particular relates to a red fluorescent powder and a preparation method thereof. Background technique [0002] LED lamp is the fourth generation of lighting electric light source after incandescent lamp, fluorescent lamp and energy-saving lamp. It is called the green light source of the 21st century. Light weight, fast response and good safety features. First reported in 1997 as YAG: Ce 3+ Yellow-emitting fluorescence as a light-conversion material, so far, blue LEDs with YAG:Ce 3+ The luminous efficiency of white light LEDs combined with phosphor powder has exceeded 1001m / W, which exceeds the luminous efficiency of fluorescent materials. However, with the blue light of the blue LED and the YAG:Ce 3+ The high-brightness white light LED combined with the yellow light of phosphor powder has its inherent defects: the lack of red light leads to poor color rendering. [0003...

AI Technical Summary

Problems solved by technology

However, with the blue light of the blue LED and the YAG:Ce 3+ The high-brightness white light LED combined with the yellow light of phosphor powder has its inherent defects: the lack of red light leads to the problem of poor color rendering

Although the luminous color is pure, the main disadvantage is that the luminous efficiency is low under the excitation of near ultraviolet light or blue light, only the green powder ZnS:Cu + ,Al 3+ and blue powder BaMgAl 10 o 17 :Eu 2+ One-eighth of that, and its lifespan is shorter than that of green powder and blue powder. Red phosphor is suitable for ultraviolet, violet or blue LED chips. It has high purity, stable chemical properties, and higher emission intensity. It is the best choice for red phosphor for LED A better choice, so the development of new red phosphor is a hot spot at home and abroad

Literature survey shows that rare earth ions activated by SrBi 2 TeO 7 Phosphor powder as matrix material has no invention disclosure and report

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