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Method for improving luminous intensity of (Y,Gd)AG:Ce fluorescent powder through modification of bismuth nitrate pentahydrate

A technology of bismuth nitrate pentahydrate and luminous intensity, which is applied in the direction of luminescent materials, chemical instruments and methods, can solve the problems of low color rendering index, low luminous efficiency, and reduced luminous intensity of white light LEDs, and achieve simple and high process requirements. The effect of low emission intensity and synthesis temperature

Inactive Publication Date: 2014-12-10
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current white LED composed of YAG:Ce phosphor and blue LED has low color rendering index, less red component, and low luminous efficiency.
In response to these problems, some scholars have proposed to use double doping to improve the red component, such as adding a Gd 3+ , Sm 3+ plasma, but if doped with Gd 3+ Ions also lead to a decrease in luminous intensity, and there is little research on how to solve this problem

Method used

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  • Method for improving luminous intensity of (Y,Gd)AG:Ce fluorescent powder through modification of bismuth nitrate pentahydrate
  • Method for improving luminous intensity of (Y,Gd)AG:Ce fluorescent powder through modification of bismuth nitrate pentahydrate
  • Method for improving luminous intensity of (Y,Gd)AG:Ce fluorescent powder through modification of bismuth nitrate pentahydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1. According to (Y 1.94 Gd 1 Ce 0.06 )Al 5 o 12 Chemical formula weighing 0.986g Y 2 o 3 , 0.816g Gd 2 o 3 , 0.117g Ce(NO 3 ) 3 ·6H 2 O and 8.438g Al(NO 3 ) 3 9H 2 O, then put the weighed Y 2 o 3 and Gd 2 o 3 Dissolve in nitric acid solution and stir well to produce yttrium nitrate and gadolinium nitrate, then dissolve yttrium nitrate, gadolinium nitrate, aluminum nitrate and cerium nitrate in 130mL deionized water to prepare 0.067mol / L yttrium nitrate, 0.035mol The mixed nitrate solution of / L gadolinium nitrate, 0.002mol / L cerium nitrate and 0.173mol / L aluminum nitrate;

[0030] Step 2, drop the prepared mixed nitrate solution into the ammonium bicarbonate solution using the back-drop coprecipitation method, wherein the 0.728mol / L ammonium bicarbonate solution includes a mass fraction of 3.5% of the nitrate in the mixed nitrate solution Sodium lauryl sulfate, ensure that the pH value is 7.2 during the titration process, and leave it to age at ro...

Embodiment 2

[0036] Step 1. According to (Y 1.94 Gd 1 Ce 0.06 )Al 5 o 12 Chemical formula weighing 0.986g Y 2 o 3 , 0.816g Gd 2 o 3 , 0.117g Ce(NO 3 ) 3 ·6H 2 O and 8.438g Al(NO 3 ) 3 9H 2 O, then put the weighed Y 2 o 3 and Gd 2 o 3 Dissolve in nitric acid solution and stir well to produce yttrium nitrate and gadolinium nitrate, then dissolve yttrium nitrate, gadolinium nitrate, aluminum nitrate and cerium nitrate in 130mL deionized water to prepare 0.067mol / L yttrium nitrate, 0.035mol The mixed nitrate solution of / L gadolinium nitrate, 0.002mol / L cerium nitrate and 0.173mol / L aluminum nitrate;

[0037] Step 2, drop the prepared mixed nitrate solution into the ammonium bicarbonate solution using the back-drop coprecipitation method, wherein the 0.728mol / L ammonium bicarbonate solution includes a mass fraction of 3.5% of the nitrate in the mixed nitrate solution Sodium lauryl sulfate, ensure that the pH value is 7.4 during the titration process, and leave it to age at ro...

Embodiment 3

[0043] Step 1. According to (Y 1.94 Gd 1 Ce 0.06 )Al 5 o 12 Chemical formula weighing 0.986g Y 2 o 3 , 0.816g Gd 2 o 3 , 0.117g Ce(NO 3 ) 3 ·6H 2 O and 8.438g Al(NO 3 ) 3 9H 2 O, then put the weighed Y 2 o 3 and Gd 2 o 3 Dissolve in nitric acid solution and stir well to produce yttrium nitrate and gadolinium nitrate, then dissolve yttrium nitrate, gadolinium nitrate, aluminum nitrate and cerium nitrate in 130mL deionized water to prepare 0.067mol / L yttrium nitrate, 0.035mol The mixed nitrate solution of / L gadolinium nitrate, 0.002mol / L cerium nitrate and 0.173mol / L aluminum nitrate;

[0044] Step 2, drop the prepared mixed nitrate solution into the ammonium bicarbonate solution using the back-drop coprecipitation method, wherein the 0.728mol / L ammonium bicarbonate solution includes a mass fraction of 3.5% of the nitrate in the mixed nitrate solution Sodium lauryl sulfate, ensure that the pH value is 7.6 during the titration process, and leave it to age at ro...

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Abstract

The invention belongs to the field of fluorescent powder preparation and in particular relates to a method for improving the luminous intensity of (Y,Gd)AG:Ce fluorescent powder through modification of bismuth nitrate pentahydrate. In order to solve the problem of deficiency of low color rendering index of a white LED (light-emitting diode) formed by combining Ce-doped YAG fluorescent powder with a blue LED, the (Y,Gd)AG:Ce fluorescent powder is prepared by adopting a bismuth nitrate pentahydrate modified reverse-titration co-precipitation method, and the energy of Bi<3+> can be transmitted to Ce<3+> through sensitized luminescence of Bi<3+> to enable Ce<3+> to obtain more energy. Therefore, the luminescence of the (Y,Gd)AG:Ce fluorescent powder is enhanced on the basis of wavelength redshift, and then the performance of yellow fluorescent powder is improved.

Description

technical field [0001] The invention belongs to the field of fluorescent powder preparation, and in particular relates to a method for improving the luminous intensity of (Y, Gd)AG:Ce fluorescent powder by modifying bismuth nitrate pentahydrate. Background technique [0002] Compared with traditional incandescent fluorescent lamps, LED has the advantages of safety and environmental protection, green and non-toxic, long life and high efficiency, making it a new light source to replace traditional light sources. The current synthetic white LED technology is mainly composed of blue LED and yellow phosphor. The performance of yellow phosphor directly affects the color rendering and lumen efficiency of white LEDs. Based on these factors, yellow phosphor has attracted extensive attention of researchers at home and abroad in recent years. However, the current white LED composed of YAG:Ce phosphor and blue LED has low color rendering index, less red component, and low luminous eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/74
Inventor 阙文修周婷
Owner XI AN JIAOTONG UNIV
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