Red luminescent powder mixed with europium and its method

A red phosphor, alkaline earth technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of high price of rare earth phosphors

Inactive Publication Date: 2003-05-07
深圳中科院知识产权投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of rare earth phosphors is that the price is relatively high. 2 o ...

Method used

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  • Red luminescent powder mixed with europium and its method
  • Red luminescent powder mixed with europium and its method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The raw material is La 2 o 3 (99.99%), CaCO 3 (analytical pure), H 3 BO 3 (analytical pure), Eu 2 o 3 (99.99%). The molar ratio between them is correspondingly 0.1:4:3.15:0.4. Fully grind the raw materials, pre-fire at 900°C for 10 hours, cool to room temperature, grind again, put them into a corundum crucible, and sinter at 1200°C for 10 hours. Take out and grind to get the sample. The obtained sample was a pure white powder, due to H 3 BO 3 There is volatilization during the reaction, and the product La 0.2 Ca 4 O(BO 3 ) 3 :Eu 0.8 . Its emission spectrum when excited at 254nm is as attached Figure 1 Show. Its main peak is at 610nm, and Y 2 o 3 :Eu 3+ resemblance. Integrate the two curves in the 570-650nm range respectively, and then divide, the sample of the present embodiment and Y 1.8 o 3 :Eu 3+ 0.2 The ratio of the integrated areas of the emission curves is 1.439.

Embodiment 2

[0014] La 2 o 3 , CaCO 3 、H 3 BO 3 、Eu 2 o 3 The molar ratio between them is 0.1:4:3.15:0.4 accordingly. Grind the raw materials thoroughly and sinter at 900°C for 10 hours. Take out and grind to get the sample. The obtained sample was a pure white powder, due to H 3 BO 3 There is volatilization during the reaction, and the product La 0.2 Ca 4 O(BO 3 ) 3 :Eu 0.8 . When excited with 254nm, its main peak is 610nm, and Y 2 o 3 :Eu 3+ resemblance. The sample of this embodiment 2 and Y 1.8 o 3 :Eu 3+ 0.2 The ratio of the integral area in the range of 570-650nm for the emission curve excited at 254nm is about 0.60.

Embodiment 3

[0016] Y 2 o 3 , CaCO 3 、H 3 BO 3 、Eu 2 o 3 The molar ratio between them is 0.1:4:3.15:0.4 accordingly. Grind the raw materials thoroughly, pre-fire at 900°C for 7 hours, cool to room temperature, grind thoroughly again, put them into a corundum crucible, and sinter at 1500°C for 1 hour. Take out and grind to get the sample. The obtained sample was a pure white powder, due to H 3 BO 3 There is volatilization during the reaction, the product Y 0.2 Ca 4 O(BO 3 ) 3 :Eu 0.8 . When excited with 254nm, its main peak is 610nm, and Y 2 o 3 :Eu 3+ resemblance. The sample of this embodiment 3 and Y 1.8 o 3 :Eu 3+ 0.2 The ratio of the integral area of ​​the emission curve excited at 254 nm in the range of 570-650 nm is 0.95.

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Abstract

An Eu-doped red fluorescent powder has a chemical formula: aMo:bRE2O3:3B2O3:cEu2O3, where a=6-8, b=0-0.999, c=0.001-2.0, M is chosen from Mg, Ca, Sr and Ba, and RE is La, Y and/or Gd. It is prepared through proportioning, grinding, sintering at 900-1500 deg.C for 1-10 hr, cooling, and grinding. Its advantages are good match with 254 nm Hg line for charge migration band, high spectrum peak, and low cost.

Description

technical field [0001] The invention belongs to a preparation method of red fluorescent powder. Background technique [0002] Red phosphors must be used in tri-primary fluorescent lamps with a high color rendering index and color displays (such as TVs, computers, etc.). As T. Welker of Phillips Research Laboratories said in Journal of Luminescence 1991, Volume 48-49, pages 49-56: "For red phosphors for lamps, there is only one phosphor used in the world, and it is Y 2 o 3 :Eu 3+ . Despite its higher price, this phosphor is close to the ideal phosphor for tri-primary lamps. Its quantum efficiency is close to 100%, and its excitation band overlaps fairly well with the 254nm mercury line. The sharp line at 613nm is its main emission peak". It should also be mentioned that Y 2 o 2 S:Eu 3+ , which is related to Y 2 o 3 :Eu 3+ The performance is similar, each has its own strengths, and it is generally used in displays excited by cathode rays. It can be said that in re...

Claims

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Application Information

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IPC IPC(8): C09K11/78
Inventor 苏锵赫泓
Owner 深圳中科院知识产权投资有限公司
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