A carbon-coated bam:eu2+ blue phosphor and preparation method thereof

A blue phosphor, carbon coating technology, used in chemical instruments and methods, luminescent materials, nanotechnology for materials and surface science, etc. Uniformity and other problems, to achieve the effect of convenient operation, improved thermal stability, and good reaction controllability

Inactive Publication Date: 2016-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Application Information

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Problems solved by technology

This method solves the attenuation problem of the current blue phosphor to a certain extent, but because the method is a liquid-phase method, the liquid-phase method has high requirements on the pH of the solution and is likely to cause uneven coating layers, which are difficult to control and the process is difficult. Complicated, resulting in poor reproducibility of the product

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  • A carbon-coated bam:eu2+ blue phosphor and preparation method thereof
  • A carbon-coated bam:eu2+ blue phosphor and preparation method thereof
  • A carbon-coated bam:eu2+ blue phosphor and preparation method thereof

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Embodiment

[0020] A carbon-coated BAM: Eu 2+ (BaMgAl 10 o 17 : Eu 2+ ) blue phosphor, characterized in that, in the BAM: Eu 2+ The surface of the blue fluorescent powder is coated with a carbon layer with a thickness of 1-20nm.

[0021] A carbon-coated BAM: Eu 2+ (BaMgAl 10 o 17 : Eu 2+ ) The preparation method of blue fluorescent powder, comprises the following steps:

[0022] Step 1: Add BAM:Eu 2+ (BaMgAl 10 o 17 : Eu 2+ ) The blue fluorescent powder is evenly spread on the quartz boat, and the thickness of the fluorescent powder is controlled to be 1-2 mm;

[0023] Step 2: Lay the above with BAM:Eu 2+ The quartz boat of the blue fluorescent powder is placed in a sintering furnace, evacuated to below 100Pa, and then nitrogen gas with a purity (in volume percentage) of 99.95% is introduced until the gas pressure is 1 standard atmospheric pressure, and the flow rate of the nitrogen gas is 0.1 ~1L / min;

[0024] Step 3: heat up to 200-900°C at a heating rate of 5°C / min, keep...

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Abstract

The invention provides a carbon-coated BAM:Eu2+ blue fluorescent powder and a preparation method thereof, belonging to the technical field of rare earth luminescent materials. In the present invention, carbon-coated BAM:Eu2+ phosphor is prepared by feeding methane in a high-temperature environment, and then the coated phosphor is subjected to high-temperature heat treatment to improve the crystallinity of the phosphor, thereby further improving the carbon-coated BAM. : the luminous intensity of the Eu2+ fluorescent powder, the coated fluorescent powder also has good thermal stability, and the invention has simple process, easy operation, good repeatability and easy large-scale production.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, in particular to a carbon-coated BaMgAl 10 o 17 : Eu 2+ (BAM: Eu 2+ ) blue fluorescent powder and its preparation method. Background technique [0002] BaM g Al 10 o l7 : Eu 2+ (BAM: Eu 2+ ) blue phosphor is widely used in plasma display (Plasma Display Panel, referred to as PDP) because of its excellent luminous efficiency under the excitation of ultraviolet and vacuum ultraviolet light. However, the BAM phosphor will have brightness attenuation during the screen coating process and the working process, which will affect the performance of the PDP. This is because in the process of screen-coating PDP, after screen printing, high-temperature firing at 600°C is required to remove the organic solvent, which will make Eu as the luminescence center 2+ Partially oxidized to Eu 3+ ; and during the working process, vacuum ultraviolet excitation radiation will cause at...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/64B82Y30/00B82Y40/00
Inventor 尹良君董俊韬简贤张晨贵陈国璋王超栾春红
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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