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Granular fluorescent powder, its production and device therewith

A fluorescent powder and granular technology, which is applied in the field of rice granular fluorescent powder and its manufacture, as well as devices made of the fluorescent powder, can solve the problems of large luminous loss, many surface holes, and serious agglomeration, and achieve simple implementation methods, Good coating performance, the effect of good coating performance

Inactive Publication Date: 2007-01-17
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 2. Irregular in appearance, including many irregular clumps, figure 1 Shown is the commercially available (Y,Gd)BO 3 :Eu phosphor products, it can be seen that there is almost no similarity between particles and particles, and the agglomeration is quite serious
[0006] 1. The powder layer cannot form a high-density accumulation when it is applied to the device (such as Figure 2.a as shown, Figure 2.a It is a photo of the stacking state of ordinary commercial phosphors), the loading density is small, and there are many holes on the surface, which causes the electrons or ultraviolet rays emitted by the excitation source to absorb less efficiently, thereby reducing the luminous efficiency
[0007] 2. Due to the low penetration depth of electrons or ultraviolet rays used to excite phosphors, larger particles cause a large loss of luminescence
[0008] 3. Larger particles limit the reduction of display pixels of corresponding display devices to a certain extent, thus limiting the improvement of clarity
However, at present, the main way to prepare spherical materials is to use spray pyrolysis or thermal decomposition after spray drying. Since there is no atomization method that can obtain uniform droplets, the particle size is not uniform, and there is a hollow phenomenon.
In addition to the above disadvantages, this method also has two fatal disadvantages: 1. The luminous efficiency of the prepared phosphor is low, which generally only reaches about 70% of that of ordinary commercial phosphors.
2. Low production efficiency and high manufacturing cost

Method used

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  • Granular fluorescent powder, its production and device therewith
  • Granular fluorescent powder, its production and device therewith
  • Granular fluorescent powder, its production and device therewith

Examples

Experimental program
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Embodiment 1

[0044] Example 1: Red (Y, Gd) BO for rice grain PDP 3 :Eu phosphor and red (Y, Gd) BO for preparing rice-shaped PDP using the method of the present invention 3 : Example of Eu phosphor. The specific implementation process is as follows:

[0045] 1) (1-3 is the precursor manufacturing process) Dissolve Y separately with 1:1 nitric acid (volume ratio) 2 O 3 , Gd 2 O 3 , Eu 2 O 3 Obtain the rare earth nitrate solution, use dimethylphenol orange as an indicator, and titrate its concentration with EDTA. The concentrations are 0.8mol / l, 0.8mol / l, and 0.1mol / l.

[0046] 2) Measure the corresponding volumes of rare earth nitrate solutions according to the stoichiometric ratio, mix them, add 5 mol% excess boric acid, and stir to dissolve them in the mixed rare earth nitrate solution.

[0047] 3) Add ammonia water dropwise to the above system to fully cause precipitation reaction to the pH of the system=9, and pour the supernatant liquid of the obtained precipitate.

[0048] 4) Add 3:1 citr...

Embodiment 2

[0052] Example 2: Green BaAl for Rice PDP 12 O 19 : Mn phosphor and green BaAl for preparing rice grain-like PDP by using the method of the present invention 12 O 19 : An example of Mn phosphor. The specific implementation process is as follows:

[0053] 1) (Step 1 is the process of manufacturing precursors) Combine high-activity Al powder and Ba(NO 3 ) 2 , MnCl 2 (All are spectrally pure) Mix according to the stoichiometric ratio, add water 10 times the weight of the mixed powder, stir, heat to 80°C, and add ammonia water dropwise to pH 8.5-9;

[0054] 2) Add glycine (A.R.) equal to the weight of the mixed powder to the product obtained in step 1, and stir thoroughly;

[0055] 3) Put the mixture obtained in step 2 into a crucible, and place it in a high-temperature furnace at 500° C. to initiate a reaction. It was then calcined in air at 1200°C for 1 hour.

[0056] 4) Put the product of step 3 in N 2 : H 2 In a reducing atmosphere of 25:75 (volume ratio), calcination at about 130...

Embodiment 3

[0057] Example 3: Rice grain PDP, blue BaMgAl for fluorescent lamps 10 O 17 : Eu phosphor and the method of the present invention to prepare rice-shaped PDP, blue BaMgAl for fluorescent lamps 10 O 17 : Example of Eu phosphor. The specific implementation process is as follows:

[0058] 1) (Step 1 is the process of manufacturing precursors) Combine high-activity Al powder and Ba(NO 3 ) 2 , EuCl 3 (All are spectrally pure) Mix according to the stoichiometric ratio, add 10 times the weight of the mixed powder with water, stir, heat to 80°C, drop ammonia water until the pH value reaches 8.5-9;

[0059] 2) Add glycine (A.R.) equal to the weight of the mixed powder to the product obtained in step 1, and stir thoroughly;

[0060] 3) Put the mixture obtained in step 2 into a crucible, and place it in a high-temperature furnace at 500° C. to initiate a reaction. It was then calcined in air at 1200°C for 1 hour.

[0061] 4) Put the product of step 3 in N 2 : H 2 In a reducing atmosphere of 2...

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Abstract

A rice-grain fluorescent powder, its production and related device are disclosed. The average grain diameter is 0.1-5um, ratio of length and width is 1.2-5, its shapes include rice grain, girdling grain and cylindrical grain. The process is carried out by preparing precursor, adding into gas barrier material and high-temperature roasting. The fluorescent powder grain is between 0.01-2um and adjustable. It is simple and cheap, has better homogeneity and higher luminescent strength. It can be used for plasma illuminating device, filed-transmitting device, fluorescent tube and white light LED device.

Description

Technical field [0001] The invention discloses a type of phosphor powder and its manufacturing and using methods. Specifically, the present invention is a rice-shaped phosphor and a manufacturing method of the phosphor, and the present invention also discloses a device made of the phosphor. Background technique [0002] Phosphors, also known as luminescent materials, are a type of material that can release photons under appropriate excitation conditions. It has been widely used in light-emitting devices such as lighting and displays. However, the currently used luminescent materials are basically synthesized by high-temperature solid-phase method, and most of their particle morphologies are as attached. figure 1 As shown, it has the following characteristics: [0003] 1. Large particle size and wide distribution. Most particle size D 50 3-10μm, particle distribution D 10 -D 90 It is 1-15μm or even wider. [0004] 2. Irregular appearance, including many irregular clumps, figure 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78F21K2/08H01J17/04H01L51/30
CPCY02B20/181Y02B20/00
Inventor 鱼志坚黄小卫崔向中李红卫庄卫东何华强
Owner GRIREM ADVANCED MATERIALS CO LTD