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Fluorescent powder for white light luminescent diode and preparing method thereof

A technology of light-emitting diodes and manufacturing methods, which is applied in the direction of luminescent materials, chemical instruments and methods, and the use of gas discharge lamps, etc., which can solve the problems of poor thermal stability and low luminous brightness of phosphors, achieve improved particle size distribution, and ensure luminescence Effects of efficiency and good temperature characteristics

Active Publication Date: 2010-02-17
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the current situation that the existing YAG:Ce phosphor powder for white light emitting diodes has low luminous brightness and poor thermal stability, the present invention provides a phosphor powder for high-efficiency white light emitting diodes and a manufacturing method thereof

Method used

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  • Fluorescent powder for white light luminescent diode and preparing method thereof
  • Fluorescent powder for white light luminescent diode and preparing method thereof
  • Fluorescent powder for white light luminescent diode and preparing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Raw materials are selected from Lu 2 o 3 , La 2 o 3 , CeO 2 、Dy 2 o 3 、Al 2 o 3 , the raw material purity is 99.9~99.99% central particle diameter d50=3 μ m, and its composition is (Lu 0.979 La 0.003 ) 3 Al 5 o 12 : Ce 0.05 , Dy 0.006 , the reaction raw material is prepared into a 10% suspension with deionized water, and the pH value of the suspension is adjusted to 3.5 with a HCl solution with a concentration of 0.05M. After ultrasonic oscillation, it is left to stand for 8hrs, and then evaporated to dryness at 100°C for 10hrs to obtain the reaction precursor body. Add 1.5% of BaF to the reaction precursor based on the weight of the precursor reaction precursor 2 and 1.4% H 3 BO 3 , after mixing evenly, put the corundum crucible in N 2 -H 2 Under the protection of mixed gas, the temperature was raised to 1450°C at a rate of 2.5°C / min, kept for 10 hours, and cooled to room temperature with the furnace. Ball mill the synthesized phosphor powder, pass ...

Embodiment 2

[0051] Raw materials are selected from Lu 2 o 3 , Y 2 o 3 、Gd 2 o 3 , CeO 2 、Dy 2 o 3 、Al 2 o 3 , the raw material purity is 99.9~99.99% central particle diameter d50=3 μ m, and its composition is (Lu 0.577 Y 0.4 Gd 0.005 ) 3 Al 5 o 12 : Ce 0.05 , Dy 0.004 , the reaction raw materials were prepared into 8% suspension with deionized water, and the concentration was 0.15M H 2 SO 4 The solution adjusts the pH value of the suspension to 2. After ultrasonic oscillation, it is left to stand for 18 hrs, and then evaporated to dryness at 100° C. for 10 hrs to obtain a reaction precursor. Add 2.0% BaF accounting for the weight of the precursor reaction precursor to the reaction precursor 2 , 0.5%H 3 BO 3 and 0.5% Na 2 CO 3 After mixing evenly, place in a corundum crucible in N 2 -H 2 Under the protection of mixed gas, the temperature was raised to 1550 °C at a rate of 2.5 °C / min, kept for 5 hours, and cooled to room temperature with the furnace. Ball mill the ...

Embodiment 3

[0053] Raw materials are selected from Lu 2 o 3 、Gd 2 o 3 , CeO 2 , Sm, Al 2 o 3 , the raw material purity is 99.9~99.99%, the central particle diameter d50=3μm, and the composition of phosphor powder is (Lu 0.375 Gd 0.6 ) 3 Al 5 o 12 : Ce 0.07 , Sm 0.004 , the reaction raw material was prepared into 8% suspension with deionized water, and the pH value of the suspension was adjusted to 4.5 with HCl solution with a concentration of 0.35M. After ultrasonic oscillation, it was left to stand for 24hrs, and then evaporated to dryness at 100°C for 10hrs to obtain the reaction precursor body. Add 1.5% BaF accounting for the weight of the precursor reaction precursor to the reaction precursor 2 , 0.5%NH 4 F and 0.6% Na 2 CO 3 After mixing evenly, place in a corundum crucible in N 2 -H 2 Under the protection of mixed gas, the temperature was raised to 1565 °C at a rate of 2.5 °C / min, kept for 3 hours, and cooled to room temperature with the furnace. Ball mill the syn...

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Abstract

The invention relates to a fluorescent powder used for white light luminescence diode and its preparation method, the fluorescent powder has chemical structural formula: (Lu1-s-(x+y) / 3Rs)3Al5O12:Cex,My, wherein R is at least one of La, Y, Gd, Tb; M is at least one of Pr, Dy, Sm; 0.0005<is equal to s<0.1; 0.005<is equal to x<is equal to 0.15; 0.001<is equal to y<is equal to 0.08]. The invention has advantages of high light brightness, fine particle size and centralized distribution, which can nicely satisfy the packaging requests for white light LED.

Description

technical field [0001] The invention relates to a fluorescent powder and a manufacturing method thereof, in particular to a white light emitting diode fluorescent powder and a manufacturing method thereof. Background technique [0002] In the 1990s, Nichia Corporation of Japan successfully developed high-efficiency blue LEDs and reported 3 al 5 o 12 : Ce 3+ (YAG:Ce) yellow light-emitting fluorescence is used as a light conversion material, and white LEDs combined with GaN blue LEDs are known to surpass incandescent lamps, New non-polluting green solid-state lighting source for fluorescent lamps and HID lamps. [0003] Yttrium aluminum garnet Y 3 al 5 o 12 : Ce(YAG), as an important phosphor, has the advantages of high quantum efficiency, good chemical stability and radiation resistance. Under the excitation of blue light at about 460nm, it can emit yellow-green light with a wavelength of about 540-560nm. In order to further improve the performance indicators of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80H01L33/00H01L33/50
CPCY02B20/181Y02B20/00
Inventor 何锦华梁超符义兵蒋建清董岩邵起越
Owner JIANGSU BREE OPTRONICS CO LTD