Red phosphor for Eu-activated light emitting diode and preparation method thereof

A technology of red fluorescent powder and light-emitting diodes, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of harsh preparation conditions, high price, low color rendering index, etc., and achieve easy operation and industrial production, and the method is simple and easy , reduce the effect of using

Inactive Publication Date: 2011-09-21
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The third method is currently the most widely used and the most mature, but its disadvantages are also very obvious. Because the white light formed by the combination of the two primary colors of yellow light and blue light lacks red components, the color rendering index is low.
Sulfides have low luminous efficiency and poor stability. Although nitrides overcome these shortcomings, the preparation conditions are harsh and expensive. Therefore, a stable performance, low price, and efficient excitation by ultraviolet, violet or blue LED chips have been developed. Red phosphor has become a hot research topic at home and abroad

Method used

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  • Red phosphor for Eu-activated light emitting diode and preparation method thereof
  • Red phosphor for Eu-activated light emitting diode and preparation method thereof
  • Red phosphor for Eu-activated light emitting diode and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] Weigh CaCO 3 (Analytical pure) 0.6301g, Al 2 o 3 (99.99%) 0.1672g, Nb 2 o 5 (99.99%) 0.4358g, Eu 2 o 3 (99.99%) 0.0462g, Li 2 CO 3 (99.99%) 0.02g, the above-mentioned raw materials are accurately weighed and mixed uniformly and then loaded into an alumina crucible and roasted in the air. The roasting temperature is 1400° C., and the holding time is 18 hours. After waiting for the temperature to drop to room temperature, the product obtained is taken out and Broken, the chemical composition obtained is (Eu 0.04 Ca 0.96 ) 2 AlNbO 6.04 of red phosphor. Its XRD pattern is shown in figure 1 , with Ca 2 AlNbO 6 The diffraction peaks of the XRD powder diffraction standard card (JCPDFNo.53-1283) completely match, indicating that the synthesized phosphor has no impurity phase, and the diffraction peak intensity is high and relatively sharp, indicating that the synthesized phosphor has good crystallinity. Its excitation spectrum see figure 2 , indicating that the...

Embodiment 2

[0031] Weigh CaCO 3 (Analytical pure) 0.6190g, Al 2 o 3 (99.99%) 0.1659g, Nb 2 o 5 (99.99%) 0.4326g, Eu 2 o 3 (99.99%) 0.0573g, Li 2 CO 3 (99.99%) 0.02g, the above-mentioned raw materials are accurately weighed and mixed uniformly and then loaded into an alumina crucible and roasted in the air. The roasting temperature is 1500 ° C, and the holding time is 18 hours. After waiting for the temperature to drop to room temperature, the product obtained is taken out and Broken, the chemical composition obtained is (Eu 0.05 Ca 0.95 ) 2 AlNbO 6.05 of red phosphor.

Embodiment 3

[0033] Weigh CaCO 3 (Analytical pure) 0.6528g, Al 2 o 3(99.99%) 0.1696g, Nb 2 o 5 (99.99%) 0.4423g, Eu 2 o 3 (99.99%) 0.0243g, Li 2 CO 3 (99.99%) 0.02g, the above-mentioned raw materials are accurately weighed and mixed uniformly and then loaded into an alumina crucible and roasted in the air. The roasting temperature is 1450° C., and the holding time is 18 hours. After waiting for the temperature to drop to room temperature, take out the product obtained and Broken, the chemical composition obtained is (Eu 0.02 Ca 0.98 ) 2 AlNbO 6.02 of red phosphor.

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Abstract

A Eu-activated light emitting diode and a method for preparing the red phosphor are disclosed in the invention. The general chemical formula of the phosphor is that: the molecular formula for the phosphor containing ions without charge compensation is (EuxCa1-x)2AlNbO6+x; the molecular formula for the phosphor containing ions with charge compensation is (EuxRxCa1-2x)2AlNbO6, R represents an alkali metal ion such as Li+, Na+ or K+. The dopant concentration x of Eu3+ ranges from 0.01 percents by weight to 0.10 percents by weight. The emission peak wavelength of the red phosphor is 617nm, and the excitation spectrum of the phosphor consists mainly of an excitation peak of 308nm, an excitation peak of 398nm and an excitation peak of 466nm. The red phosphor prepared in the invention is capableof emitting strong red light at a wavelength of 610-630nm upon excited by ultraviolet light, purple light or blue light, Thereby that the packaging requirements for white light LED can be satisfied favorably, the color rendering index can be increased, and the color temperature can be decreased. The method for preparing the phosphor is simple and easy to perform, and is easy to apply in industry.

Description

technical field [0001] The invention relates to a rare-earth luminescent material, in particular to a red fluorescent powder for a europium-activated light-emitting diode and a preparation method thereof. technical background [0002] White light-emitting diode (hereinafter referred to as LED), as a new type of green and environmentally friendly solid-state lighting source, has the advantages of small size, light weight, low energy consumption, long life, high brightness, and small environmental pollution. It is a valuable new light source and has broad application prospects in many fields. [0003] At present, there are three main ways to realize white LED lighting: [0004] The first is to form white light through the combination of red, green and blue LED chips. However, this method needs to consider the different driving characteristics of the three chips, and the circuit design is very complicated. [0005] The second is the integrated single-chip method, also called...

Claims

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Application Information

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IPC IPC(8): C09K11/67
Inventor 赵呈春杭寅尹继刚张连翰胡鹏超弓娟
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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