Process for production of fluorescent substance

A technology of fluorescent substances and phosphors, applied in chemical instruments and methods, luminescent materials, nitrogen compounds, etc., can solve problems such as intractable, expensive compounds, chemical instability, etc.

Inactive Publication Date: 2012-03-21
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this method can prevent by-product formation, the Sr used as a Sr source in this method 3 N 2 The chemical instability makes it easy to decompose in the air, so it is very difficult to handle
In addition, Sr 3 N 2 is an expensive compound

Method used

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  • Process for production of fluorescent substance
  • Process for production of fluorescent substance
  • Process for production of fluorescent substance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Weigh 7.46g SrO, 1.41g Eu respectively 2 o 3 and 5.62g Si powder as raw material and dry mixed. In the obtained mixture, the composition ratio (molar ratio) of elements Sr:Eu:Si was 1.8:0.2:5.0. Put the mixture in a BN container, and then place H in it at 1500°C under atmospheric pressure 2 and N 2 The flow rates were respectively 5 L / min and 5 L / min in a reducing atmosphere for 8 hours to obtain the intermediate product in the first step. This intermediate emits orange light with a peak at about 650 nm when excited by 365 nm UV light. The observed emission spectra are shown in figure 1 middle. In addition, the intermediate product was measured by X-ray diffraction using Cu-Kα line to obtain figure 2 The diffraction pattern shown. The diffraction pattern has many diffraction lines corresponding to the lines of the pattern shown by Xie et al. in Chem. 2 Si 5 N 8 components shown. This intermediate product was then subjected to compositional analysis to dete...

Embodiment 2

[0070] Weigh 9.33g SrO, 1.76g Eu respectively 2 o 3 and 4.68g Si 3 N 4 As raw material and dry blended. In the obtained mixture, the composition ratio (molar ratio) of elements Sr:Eu:Si was 0.9:0.1:1.0. Put the mixture in a container made of SiC, and then place H in it under atmospheric pressure at 1400°C 2 and N 2 The flow rates were respectively 5 L / min and 5 L / min in a reducing atmosphere for 8 hours to obtain the intermediate product in the first step. This intermediate emits orange light with a peak at about 640 nm when excited by 365 nm UV light. In addition, the intermediate product was subjected to X-ray diffraction measurement, thereby confirming that it contained (Sr, Eu) 2 Si 5 N 8 components shown. This intermediate product was then subjected to compositional analysis to determine the molar ratio of oxygen to the sum of strontium and europium. As a result, the ratio was found to be 0.73, thus proving that the intermediate product contained only a small a...

Embodiment 3 and 4

[0073] Weigh 10.95g Sr(OH) respectively 2 , 1.76g Eu 2 o 3 and 5.62g Si powder as raw material and dry mixed. In the obtained mixture, the composition ratio (molar ratio) of elements Sr:Eu:Si was 0.9:0.1:2.0. Put the mixture in a BN container, and then at 1600°C under atmospheric pressure, Hx and N 2The flow rates were respectively 5 L / min and 5 L / min in a reducing atmosphere for 8 hours to obtain the intermediate product in the first step. This intermediate emits yellow-orange light with a peak at about 650 nm when excited by 365 nm UV light. In addition, the intermediate product was subjected to X-ray diffraction measurement, and thus proved to contain (Sr, Eu) 2 Si 5 N 8 components shown. This intermediate product was then subjected to compositional analysis to determine the molar ratio of oxygen to the sum of strontium and europium. As a result, the ratio was found to be 0.34, thus proving that the intermediate product contained only a small amount of oxygen.

[...

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Abstract

The embodiment provides a process for production of an oxynitride fluorescent substance. In the process, a compound represented by the formula: (Sr,Eu) 2 Si 5 N 8 , silicon nitride and aluminum nitride are mixed and then fired in a nitrogen atmosphere under high pressure.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from Japanese Patent Application No. 2010-193789 filed on August 31, 2010 and Japanese Patent Application No. 2011-21727 filed on February 3, 2011; the entire contents of which are incorporated herein as refer to. technical field [0003] This embodiment relates to a production method of an oxynitride fluorescent substance. Background technique [0004] LED devices emitting white light are now generally used as light sources in lighting and the like, which are single devices including a combination of a fluorescent substance and a semiconductor light emitting element such as an LED to emit white light. Phosphors employed in LED devices that emit white light need to exhibit high luminous efficiency when excited by near-ultraviolet to blue light. Various oxynitride fluorescent substances have been proposed as fluorescent substances. For example, WO07 / 105631 discloses a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
CPCC01B21/0821C01B21/0826C01P2002/52C01P2002/72C01P2002/84C09K11/77348C09K11/77C09K11/55C09K11/59C09K11/64C09K11/7728
Inventor 松田直寿福田由美加藤雅礼
Owner KK TOSHIBA
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