Near-UV excitation blue light fluorescent powder used for white light LED and preparation method thereof

A near-ultraviolet light and phosphor technology, applied in chemical instruments and methods, luminescent materials, inorganic chemistry, etc., can solve the problem of high production cost of blue phosphors, achieve stable color development, simplify equipment, and achieve lumen efficiency. high effect

Inactive Publication Date: 2017-04-26
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a near-ultraviolet light-excited blue phosphor for white LEDs and a preparation method thereof. On the basis

Method used

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  • Near-UV excitation blue light fluorescent powder used for white light LED and preparation method thereof
  • Near-UV excitation blue light fluorescent powder used for white light LED and preparation method thereof
  • Near-UV excitation blue light fluorescent powder used for white light LED and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0031] Example 1:

[0032] This embodiment provides a blue phosphor for white light LED excited by near ultraviolet light, and the chemical formula of the blue phosphor is Ca 4-x ZrGe 3 O 12 : XBi 3+ ; Among them, x = 0.12, the chemical formula of the blue phosphor is Ca 3.88 ZrGe 3 O 12 :0.12Bi 3+ . According to this composition, the ratio of each raw material is calculated as shown in Table 1.

[0033] Table 1 Ca 3.88 ZrGe 3 O 12 :0.12Bi 3+ Raw material ratio of phosphor

[0034] raw material quality CaCO 3

[0035] The preparation method of the near-ultraviolet light-excited blue phosphor for white LEDs of this embodiment is as follows: according to the raw material ratio in Table 1, the above-mentioned raw materials are accurately weighed, carefully ground in an agate mortar, and then filled Small alumina crucible. It was calcined at 1300°C for 8 hours, cooled to room temperature naturally, and then taken out, and the product was crushed and ground to obtain phosphors.

[00...

Example Embodiment

[0042] Example 2:

[0043] This embodiment provides a blue phosphor for white light LED excited by near ultraviolet light, and the chemical formula of the blue phosphor is Ca 4-x ZrGe 3 O 12 : XBi 3+ ; Among them, x = 0.01, the chemical formula of the blue phosphor is Ca 3.99 ZrGe 3 O 12 :0.01Bi 3+ . According to this composition, the ratio of each raw material is calculated as shown in Table 2.

[0044] Table 2 Ca 3.99 ZrGe 3 O 12 :0.01Bi 3+ Raw material ratio of phosphor

[0045] raw material quality CaCO 3

[0046] The method for preparing blue phosphors for white LEDs excited by near-ultraviolet light in this embodiment is as follows: according to the raw material ratio in Table 2, the above-mentioned raw materials are accurately weighed, carefully ground in an agate mortar, and then filled Small alumina crucible. Keep it at 500°C for 3 hours, cool it to room temperature, take it out, grind it again, calcine it at 1400°C for 3 hours, cool it to room temperature, take it out...

Example Embodiment

[0048] Example 3:

[0049] This embodiment provides a blue phosphor for white light LED excited by near ultraviolet light, and the chemical formula of the blue phosphor is Ca 4-x ZrGe 3 O 12 : XBi 3+ ; Among them, x = 0.04, the chemical formula of the blue phosphor is Ca 3.96 ZrGe 3 O 12 :0.04Bi 3+ . According to this composition, the ratio of each raw material is calculated as shown in Table 3.

[0050] Table 3 Ca 3.96 ZrGe 3 O 12 :0.04Bi 3+ Raw material ratio of phosphor

[0051] raw material quality CaCO 3

[0052] The preparation method of the near-ultraviolet light-excited blue phosphor for white LEDs of this embodiment is as follows: according to the raw material ratio in Table 3, accurately weigh the above-mentioned raw materials, carefully grind them in an agate mortar, and put them in Small alumina crucible. It was calcined at 1350°C for 6 hours, cooled naturally to room temperature, and then taken out. The product was crushed and ground to obtain phosphors.

[0053] Th...

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Abstract

The invention provides near-UV excitation blue light fluorescent powder used fro a white light LED and a preparation method thereof. The chemical formula of the blue light fluorescent powder is Ca4-xZrGe3O12:xBi3+, wherein 0.01<=x<=0.4. The method includes the concrete steps that a calcium-containing compound, a zirconium-containing compound, a bismuth-containing compound and a germanium-containing compound are mixed with a cosolvent boron-containing compound to be calcined for 3-8 hours at the temperature of 1300-1400 DEG C and cooled to obtain the fluorescent powder. Non-rare earth ions are adopted as an activator, germinate without rare earth elements is adopted as a substrate material, and the activator and the substrate material are synergistically cooperated to obtain the blue light fluorescent powder Ca4-xZrGe3O12:xBi3+ (0.01<=x<=0.04). Emitted blue light is stable in color development, luminous efficiency is high, no rare earth elements are contained, and the high cost of the blue light fluorescent powder is lowered.

Description

technical field [0001] The invention belongs to the field of inorganic photoluminescent materials and relates to a white LED excited by near ultraviolet light, in particular to a blue fluorescent powder for white LED excited by near ultraviolet light and a preparation method thereof. Background technique [0002] White light LED is widely used in the field of lighting and display because of its many advantages such as energy saving, environmental protection, small size, long life, fast response speed, all solid state, shock resistance and good safety performance. [0003] At present, there are two main ways to realize commercial white LED devices: one is to coat the GaInN blue chip with Y 3 Al 5 o 12 : Ce 3+ The representative yellow phosphor uses the yellow light of the phosphor and the blue light of the chip to form white light. The luminescent color of this device changes with the thickness of the phosphor powder and the change of the driving current. The color reprod...

Claims

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Application Information

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IPC IPC(8): C09K11/67H01L33/50C01G25/00
CPCH01L33/502C09K11/74C01G25/006C01P2002/72
Inventor 蒋自强孙志华于晓晨段理闵一桐黄慈航吕婉毓
Owner CHANGAN UNIV
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