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Fluorescent powder for white light-emitting diodes (LEDs) and backlight LEDs

A fluorescent powder and backlight technology, applied in the field of fluorescent powder, can solve the problems of low brightness, low color rendering, high color temperature, etc., and achieve the effect of low synthesis temperature, uniform distribution of luminous ions, and high brightness

Inactive Publication Date: 2012-02-15
上海穗杉实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the white light obtained by this method has too high color temperature, low color rendering, and low brightness.

Method used

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  • Fluorescent powder for white light-emitting diodes (LEDs) and backlight LEDs
  • Fluorescent powder for white light-emitting diodes (LEDs) and backlight LEDs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Example 1 Weigh 0.90 moles of La(NO 3 ) 3 , dissolved in 1000 ml of distilled water, 0.1 mol of Ce(NO 3 ) 3 , 2 moles of Sr(NO 3 ) 2 , 1 mole of Al(NO 3 ) 3 , and stirred for 60 minutes. Add 1.0 mol of oxalic acid, stir for 60 minutes, add 100 ml of ammonia, stir for 30 minutes, add 0.001 mol of BaF 2 Co-solvent, filtered. Constant temperature at 1000°C for 6 hours in a box furnace, broken, put into a crucible, and then constant temperature at 1300°C for 6 hours in a reducing atmosphere, crushed, ball milled, washed, dried at 120°C for 5-10 hours, passed through a 200-mesh drying net , to obtain the phosphor powder.

Embodiment 2

[0016] Example 2 Weigh 0.95 moles of Y (NO 3 ) 3 , dissolved in 1000 ml of distilled water, 0.1 mol of Ce(NO 3 ) 3 , 2 mol Ba(NO 3 ) 2 , 1 mole of Al(NO3)3, stirred for 60 minutes. Add 1.0 mol of oxalic acid, stir for 60 minutes, add 100 ml of ammonia, stir for 30 minutes, add 0.001 mol of SrF 2 Co-solvent, filtered. Keep the temperature at 1000°C for 6 hours in a box furnace, crush it, put it into a crucible, and then keep the temperature at 1300°C for 6 hours in a reducing atmosphere, crush, ball mill, wash, dry at 120°C for 10 hours, and pass through a 200-mesh drying screen to obtain the obtained Phosphor powder.

Embodiment 3

[0017] Example 3 Weigh 0.95 moles of La(NO 3 ) 3 , dissolved in 1000 ml of distilled water, 2 moles of Ca(NO 3 ) 2 , 0.05 mol of Ce(NO 3 ) 2 , 1 mole of Al(NO 3 ) 3 , and stirred for 60 minutes. Add 1.0 mol of oxalic acid, stir for 60 minutes, add 100 ml of ammonia water, stir for 30 minutes, add 0.001 mol of NH 4 Cl co-solvent, filtered. In a box furnace at a constant temperature of 1000 degrees Celsius for 6 hours, broken, put into a crucible, in a reducing atmosphere of 1300 degrees Celsius, kept at a constant temperature for 6 hours, crushed, ball milled, washed, dried at 120 degrees Celsius for 10 hours, passed through a 200-mesh drying net to obtain the described Phosphor.

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Abstract

The invention belongs to the technical field of light-emitting diode (LED) light source and in particular relates to fluorescent powder for white LEDs and backlight LEDs. The chemical structural formula of the fluorescent powder is RE1xCexM2AlO5, wherein M is one or more of alkaline-earth metals; RE is one or more of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm and Lu in rare-earth elements; and x is more than or equal to 0.001 and less than 1. During preparation, nitrates of various elements serve as original reactants; NH4X, BaX2, SrX2, boric acid or borate serves as a cosolvent; a liquid phase method is adopted; the materials are burned at high temperature in air and then are reduced in reducing atmosphere; the prepared fluorescent powder has higher brightness and stability and a more complete crystal form. During preparation, oxalate and ammonia water serve as precipitating agents, so that the elements RE, Ce, Al and M in the structural formula are precipitated completely, and the phase purity of the fluorescent powder can be improved. The fluorescent powder can be used for preparing the white LEDs and the backlight LEDs.

Description

technical field [0001] The invention belongs to the technical field of LED light sources, and in particular relates to a fluorescent powder for LED devices. Background technique [0002] LED technology is a highly efficient light-emitting device that converts electrical energy into light energy. It has the incomparable advantages of incandescent lamps and ordinary compact phosphors, non-toxic, long life and low calorific value. It has many advantages such as small size, low working voltage, good safety performance and environmental protection. Grams are widely used in the field of lighting and display backlight. [0003] At present, LED white light emitting technology is mainly realized by using YAG which can absorb blue light emitted by LED and produce yellow light. However, the white light obtained by this method has too high color temperature, low color rendering, and low brightness. Therefore, it is of great significance to find phosphors with high efficiency, stabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
CPCY02B20/00
Inventor 曾菲贾吉来赵宏炜丁艳宾张敏周庆庆祖利娟
Owner 上海穗杉实业股份有限公司
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