Rare-earth-ion-doping stronium pyrophosphoric fluorescent power used in white light LED and preparing method of rare-earth-ion-doping stronium pyrophosphoric fluorescent power

Abstract

The invention discloses rare-earth-ion-doping stronium pyrophosphoric fluorescent power used in a white light LED and a preparing method of the rare-earth-ion-doping stronium pyrophosphoric fluorescent power. The chemical formula of the rare-earth-ion-doping stronium pyrophosphoric fluorescent power is Sr 2 (1.5x 1.5 y) P2O7:xDy 3+, yCe3+, 0<x<=0.085, 0<=y<=0.10, and 0<x+y<=0.15. The preparing method comprises the specific steps of weighing stronium salt, dysprosium oxide and cerium salt; using concentrated acid to dissolve dysprosium oxide; adding stronium salt and cerium salt and continuously stirring the mixture till the solution is fully mixed; preparing a precipitant solution, and slowly and dropwise adding the precipitant solution into the mixed solution, adjusting the pH value to 7-8, conducting leaching and drying after a full reaction, and then obtaining a precursor after grinding; placing the precursor into a reducing atmosphere stove to conduct calcination for 1-3 hours at the temperature of 700-900 DEG C to obtain a target product. The fluorescent power has strong absorption within 300-320 nm, the wavelengths of emitting peak values are 385 nm, 480 nm, 573 nm and 661 nm separately, three colors including red, green and blue are covered, the illumination intensity is high and stable, and thus the rare-earth-ion-doping stronium pyrophosphoric fluorescent power is suitable for being used in the white light LED excited by near ultraviolet.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials for near-ultraviolet excited white light LEDs, and in particular relates to a Ce 3+ , Dy 3+ Doped strontium pyrophosphate single-matrix nanoscale phosphor and its preparation method. Background technique [0002] At present, there are three ways to realize white LED. The first method is to combine InGaN Blu-ray chip with Y 3 Al 5 o 12 : Ce 3 + (YAG: Ce) yellow phosphor combination, however, the white light LED obtained by this method has become the most commonly used commercial white light LED due to its simple structure and low cost, but because of the lack of red light components, the color rendering index Low temperature and poor color temperature stability, the lighting effect is not always ideal. The second method is to assemble red, green, and blue three primary color LED chips together, and realize white light by controlling the current of the three primary color chips...

AI Technical Summary

Problems solved by technology

The first method is to combine InGaN Blu-ray chip with Y 3 al 5 o 12 : Ce 3 + (YAG: Ce) yellow phosphor combination, however, the white light LED obtained by this method has become the most commonly used commercial white light LED due to its simple structure and low cost, but because of the lack of red light components, the color rendering index Low and poor color temperature stability, the lighting effect is not always ideal

The second method is to assemble red, green, and blue three primary color LED chips together, and realize white light by controlling the current of the three primary color chips, but the circuit assembly of the three primary color chips is complicated, the cost is high, and the heat dissipation problem is serious. In addition, the power supply parameters Fluctuation, difficult to obtain stable white light

The third method is to use a near-ultraviolet chip to excite red, green, and blue phosphors. Adjusting the ratio of the three-color phosphors according to the principle of three primary colors can obtain ideal white light. However, there is strong reabsorption between different phosphors, which will reduce the emission efficiency. , and the difference in physical properties between phosphors will affect the luminous life of white light. After long-term use, color shift is prone to occur, and the white light obtained is unstable and not durable.

[0004] However, rare earth ion doped Sr 2 P 2 o 7 There is almost no research on the white phosphor powder of the matrix, and its preparation method is relatively simple, almost all of which are high-temperature solid-phase methods. Larger than 10 microns, poor luminous performance

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