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Red phosphor for luminescence diode and preparing method thereof

A technology of red phosphor and light-emitting diode, which is applied in the field of preparation of phosphate red phosphor, can solve problems such as failure to realize red light emission, and achieve the effects of stable chemical properties of products, low production costs, and cheap and easy-to-obtain raw materials

Active Publication Date: 2007-10-17
中科光电(长春)股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, Z.C.Wu et al. reported a divalent europium-activated light-emitting diode with blue phosphor LiSrPO 4 :Eu 2+ (A novel blue-emitting phosphor LiSrPO 4 :Eu 2+ for white LEDs, J.Solid State Chem.179(2006) 2356-2360), although this phosphor can be effectively excited by gallium nitride light source, it also fails to achieve red light emission
There is no phosphate phosphor powder for red light emitting diodes activated by divalent europium until the present invention

Method used

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  • Red phosphor for luminescence diode and preparing method thereof
  • Red phosphor for luminescence diode and preparing method thereof
  • Red phosphor for luminescence diode and preparing method thereof

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Effect test

Embodiment 1

[0015] Raw material is CaCO 3 (analytical pure), CaHPO 4 (analytical pure), Eu 2 o 3 (99.99%), the molar ratio between them is 0.98: 1: 0.01, the raw material is added into ethanol and fully ground, dried, placed in a corundum crucible, and then put into a high-temperature furnace under a CO atmosphere and roasted at 1350 ° C for 10 Hours, naturally cooled to room temperature to obtain a red fluorescent powder for light-emitting diodes.

[0016] The obtained red fluorescent powder for light-emitting diodes is yellow-white powder. Its excitation peak is shown in Figure 1; its emission spectrum is broadband emission, as shown in Figure 2 and Figure 3; when excited with 398nm near-ultraviolet light and 465nm blue light, the maximum emission wavelength of the phosphor is located around 600nm and 612nm respectively.

Embodiment 2

[0018] Raw material is CaCO 3 (analytical pure), CaHPO 4 (analytical pure), Eu 2 o 3 (99.99%), the molar ratio between them is 0.98:1:0.01, add ethanol to the raw material and fully grind it evenly, dry it, put it in a corundum crucible, put it into a high-temperature furnace and roast 8 pieces at 1400°C under a CO atmosphere. Hours, naturally cooled to room temperature to obtain a red fluorescent powder for light-emitting diodes.

[0019] The obtained red phosphor powder for light-emitting diodes is slightly yellow powder, and its excitation peak is as shown in Figure 1; its emission spectrum is broadband emission, as shown in Figure 2 and Figure 3; When excited, the maximum emission wavelengths of the phosphors are located around 600nm and 612nm respectively.

Embodiment 3

[0021] Raw material is CaCO 3 (analytical pure), CaHPO 4 (analytical pure), Eu 2 o 3 (99.99%), the molar ratio between them is 0.98:1:0.01, the raw materials are added to ethanol and fully ground evenly, dried, placed in a corundum crucible, put into a high-temperature furnace and roasted at 1450 ° C under a CO atmosphere. Hours, naturally cooled to room temperature to obtain a red fluorescent powder for light-emitting diodes.

[0022] The obtained red phosphor powder for light-emitting diodes is light yellow powder, the color of the sample is darker than that of Example 2, and its excitation peak is as shown in Figure 1; its emission spectrum is broadband emission, as shown in Figure 2 and Figure 3; When excited with 398nm near-ultraviolet light and 465nm blue light, the maximum emission wavelengths of the phosphor are located around 600nm and 612nm respectively.

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Abstract

The invention relates to a red light fluorescent powder for the injection luminescence diode and its producing method. The chemical formula of the invention is Ca4(1-x)O(PO4)2:xEu2+, wherein, x=0.01-10%. The producing method includes mixing the carbonate, oxide, phosphate, oxalate, nitrate which represents the element in formula, grinding and mixing uniformly, sintering for 3-7 hours at 1350-1550 DEG C at deoxidized atmosphere, getting a red light fluorescent powder for the injection luminescence diode, emitting red light excited by the ultraviolet light or blue light gallium nitride as light source, with the main emitting wavelengh respectively near 612 nm. The excitation band overlaps with the emitting peak of the blue light gallium nitride LED, which can be effectively excited and used as a red fluorescent powder for near ultraviolet or blue LED.

Description

technical field [0001] The invention relates to a preparation method of phosphate red fluorescent powder, in particular to a red fluorescent powder for light-emitting diodes and a preparation method. technical background [0002] White light-emitting diodes (LEDs) using blue-emitting gallium nitride as the excitation light source have attracted widespread attention due to their low energy consumption, long life, small size, light weight, compact structure, no pollution, and good stability. At present, white light can be used to excite yellow phosphor YAG:Ce by using gallium nitride blue light as the excitation source. 3+ The resulting blue-yellow mixed light is achieved. In this device, the blue light emitted by gallium nitride is absorbed by the phosphor and converted into long-wavelength yellow light emission, and the unabsorbed blue light is recombined with the yellow light emitted by the phosphor to obtain white light. The white light synthesized by this method has a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/81H01L33/00H01L33/50
Inventor 李成宇庞然苏锵
Owner 中科光电(长春)股份有限公司
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