Preparation process of fluorescent powder for white light LED excited by blue light

A technology of blue light excitation and fluorescent powder, applied in chemical instruments and methods, the use of gas discharge lamps, luminescent materials, etc., can solve the problems of long preparation cycle, carbon pollution, explosion, etc., and achieve easy control of production conditions and reduce production costs , The effect of simple preparation process

Inactive Publication Date: 2007-07-18
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

The mixed gas of nitrogen and hydrogen has strict requirements for burning conditions, long burning time, long preparation cycle, high cost, and it is easy to cause explosion due to the existence of hydrogen in the preparation process.
Chinese patent CN1730607A discloses a method for preparing cerium-activated garnet-structured luminescent materials. This patent is obtained by directly mixing carbon powder into the raw materials. This preparation method is due to the direct addition of carbon to the raw materials. If the amount of carbon added is insufficient , Tetravalent cerium ions cannot be effectively reduced, if too much carbon is added, it will lead to direct carbon pollution, and it is difficult to obtain efficient luminescent materials
Therefore, this preparation method cannot well meet the needs of actual production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] weigh Y 2 o 3 9.991g, Al 2 o 3 7.647g, AlF 3 0.4g, CeO 2 0.258g. Use a ball mill to grind and mix thoroughly, put it into a smaller alumina crucible, cover it with a non-sealed lid, and then put it into a larger alumina crucible, put ink or carbon between the outer crucible and the inner crucible , cover the outer crucible with a sealing cover, put it into a high-temperature furnace, burn it for 4 hours at 1400°C, take it out after cooling, remove the ink or carbon, disperse it by ball milling, wash it after sieving, and then dry it to obtain the composition Y 2.95 Ce 0.05 al 5 o 12 Phosphors for white LEDs with a luminance of 108 when excited at 460nm.

Embodiment 2

[0019] weigh Y 2 o 3 9.991g, Al 2 o 3 7.647g, CeO 2 0.258g, H 3 BO 3 0.2g. Other conditions are the same as embodiment 1, and the obtained composition is Y 2.95 Ce 0.05 al 5 o 12 Phosphors for white LEDs with a luminance of 105 when excited at 460nm.

Embodiment 3

[0021] weigh Y 2 o 3 9.991g, Al 2 o 3 7.647g, MgF 2 0.3g, CeO 2 0.258g. Other conditions are the same as embodiment 1, and the obtained composition is Y 2.95 Ce 0.05 al 5 o 12 Phosphors for white LEDs with a luminance of 105 when excited at 460nm.

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Abstract

The present invention is preparation process of phosphor powder for blue light excited white light LED. The phosphor powder has the chemical formula of (R3-x-yCexLny)A5O12, where, R is at least one of Y, La, Gd, Tb, Lu and Sc; Ln is at least one of Pr, Dy, Nd, Sm, Dy and Bi; A is at least one of B, Al, Ga, Si, Mn and Mg; x is 0.01-1.2; and y is 0-0.2. The preparation process of the phosphor powder includes mixing oxides, hydroxides or salts corresponding to the elements in the formula and proper amount of flux; setting the mixture into the inner crucible with an unsealed cover, setting graphite or carbon between the outer crucible and the inner crucible, and covering the outer crucible with sealing cover; igniting inside a high temperature furnace at 1350-1700 deg.c, for 1-8 hr; cooling, crushing, washing and stoving to obtain the phosphor powder.

Description

technical field [0001] The invention relates to a method for preparing blue-excited phosphor powder for white light LEDs. Background technique [0002] In recent years, the all-solid-state white LED lighting source, which has many advantages such as energy saving, environmental protection, long life, no radiation, resistance to harsh environments, and short response time, has continuously expanded its application fields and has gradually replaced incandescent lighting from "special lighting". Lamps and fluorescent lamps will become a new generation of green lighting sources and show broad application prospects and great development potential. Its wide application will cause a revolution in the lighting industry, and will drive the rapid development of a large number of related industries. The currently practical white light LED is a high-brightness white light produced by combining the blue light emitted by gallium nitride light-emitting diodes with garnets composed of vari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/77H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 尤洪鹏李文洪广言
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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