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Fluorescent material and preparation method thereof

A technology of fluorescent materials and compounds, applied in the field of luminescent materials, can solve problems such as energy loss, color reabsorption, and affecting the service life of white light LEDs, and achieve the effect of reducing difficulty and increasing service life

Inactive Publication Date: 2010-09-01
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the different luminous efficiencies of different phosphors, it is necessary to adjust the ratio of the phosphor mixture to obtain white light, which makes the preparation process of white LEDs difficult to control.
At the same time, due to the different aging rates of different phosphors, the obtained white light is not stable, which affects the service life of white LEDs
In addition, there are problems such as color reabsorption and energy loss between phosphor mixtures, which affect the performance of white LEDs.

Method used

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  • Fluorescent material and preparation method thereof
  • Fluorescent material and preparation method thereof
  • Fluorescent material and preparation method thereof

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preparation example Construction

[0054] The present invention also provides a method for preparing a fluorescent material, the fluorescent material has an atomic ratio composition represented by the general formula (I):

[0055] m 9(1-x-y) Ln(PO 4 )7 :Eu x , Mn y

[0056] (I)

[0057] Its preparation method includes:

[0058] Grinding and mixing the M-containing compound, the Ln-containing compound, the Eu-containing compound, the Mn-containing compound and ammonium dihydrogen phosphate and / or diammonium hydrogen phosphate to obtain a mixture;

[0059] Calcining the mixture under a reducing atmosphere to obtain a fluorescent material;

[0060] The M is one or more of Mg, Ca, Sr or Ba, and the M-containing compound is one or more of the oxide, hydroxide or carbonate of M;

[0061] Ln is one or more of La, Lu, Gd, Dy, Tb, Y, Ce, Pr, Nd, Sm, Ho, Er, Tm or Yb, and the compound containing Ln is an oxide of Ln, containing One or more of hydroxides of Ln or carbonates containing Ln;

[0062] The Eu-containi...

Embodiment 1

[0071] Weigh 0.4279gCaCO 3 , 0.0906gGd 2 o 3 , 0.4026gNH 4 h 2 PO 4 , 0.0079gEu 2 o 3 and 0.0207gMnCO 3 , thoroughly grind and mix the above-mentioned substances, place them in a corundum crucible, bake them in a high-temperature furnace at 1200°C in a CO atmosphere for 4 hours, take them out when cooled to 1000°C, and after grinding and dispersing, the composition of Ca is obtained. 8.55 Gd(PO 4 ) 7 :Eu 0.01 , Mn 0.04 fluorescent material.

[0072] Carry out X-ray powder diffraction (XRD) to the fluorescent material prepared in this embodiment with Bruker D8Focus type diffractometer, test condition is: CuKα radiation, λ=0.15405nm, acceleration voltage and emission current are respectively 40kV and 40mA, scanning range: 2θ =10-80°; test results see figure 1 , figure 1 For the XRD spectrogram of the fluorescent material prepared in Example 1 of the present invention, by figure 1 It can be seen that the fluorescent material obtained in the embodiment of the presen...

Embodiment 2

[0075] Weigh 0.4279gCaCO 3 , 0.0565gY 2 o 3 , 0.4026gNH 4 h 2 PO 4 , 0.0109gEu 2 (CO 3 ) 3 and 0.0207gMnCO 3 , carry out thorough grinding and mixing, put it into a corundum crucible, put it into a high-temperature furnace and bake it in a CO atmosphere at 1200 ° C for 4 hours, take it out when it is cooled to 1000 ° C, and after grinding and dispersing, the composition of Ca is obtained. 8.55 Y(PO 4 ) 7 :Eu 0.01 , Mn 0.04 fluorescent material.

[0076] Carry out X-ray powder diffraction (XRD) to described fluorescent material with Bruker D8Focus type diffractometer, the result shows that the fluorescent material that the embodiment of the present invention obtains is a single substance, has realized Eu and Mn in Ca 8.55 Y(PO 4 ) 7 Doping in.

[0077] Excitation and emission tests were carried out on the fluorescent material with a Hitachi F-7000 fluorescence spectrometer, and a 150W xenon lamp was used as the excitation light source. Excited by ultraviolet li...

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Abstract

The invention provides a fluorescent material, which comprises components in an atomic ratio shown in a general formula (I): M9(1-x-y)Ln(PO4)7:Eux, Mny (I), wherein M is one or more of Mg, Ca, Sr and Ba; Ln is one or more of La, Lu, Gd, Dy, Tb, Y, Ce, Pr, Nd, Sm, Ho, Er, Tm and Yb; and x+y is more than or equal to 0.001 and less than or equal to 0.1. The fluorescent material has stable performance, and can emit high-intensity blue and green light and red light when excited by light with the wavelength between 250 and 430nm so as to obtain white light. The fluorescent material is not needed to be mixed with other fluorescent materials, and the white light can be obtained; and the problems of control of mixture ratio, color re-absorption and the like do not exist, so the obtained white light is stable; therefore, the difficulty in preparing white LEDs is reduced, and the service life of the white LEDs is prolonged.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a fluorescent material and a preparation method thereof. Background technique [0002] White light-emitting diodes (LEDs) have excellent performances such as energy saving, environmental protection, long service life, small size, impact resistance, and high efficiency. They are widely used in many fields such as LCD backlight, indicator lights, and outdoor lighting. [0003] Currently, commercial white LEDs are Y 3 al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) as luminescent powder, which is coated on the InGaN chip emitting blue light, and white light is obtained by mixing yellow light and blue light. However, YAG:Ce 3+ There is a lack of red components in the phosphor, so the color rendering is relatively poor, and because the luminescent color of the device changes with the change of the driving voltage and the thickness of the phosphor, the performance of the obtained wh...

Claims

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Application Information

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IPC IPC(8): C09K11/81
CPCY02B20/181Y02B20/00
Inventor 尤洪鹏郭宁洪广言
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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