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A kind of blue fluorescent powder for white light LED and preparation method thereof

A blue phosphor, white light technology, applied in the field of fluorescent materials, can solve problems such as increased experimental risk, limitation of luminous efficiency, complicated preparation process, etc., and achieves good chemical stability and thermal stability, easy to operate, and a wide range of raw material sources. Effect

Active Publication Date: 2017-01-18
徐州博创建设发展集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Where C is one or more of Ca, Mg, and Ba, X is one or more of Li, Na, and K plus an equal amount of Al, and M is one or more of Al, Ga, and In ; where 01-x Eu x (AlPO 4 ) z The components of O, where x=0.001~0.1; z=0.9~1.2, can be effectively excited by ultraviolet light and blue light, and emit broadband visible fluorescence with a central peak at around 440 nm, but the reducing gas is CO or H 2 +N 2 , these not only put forward higher requirements for the equipment, but also increase the risk of the experiment, and the operation is more complicated
Another example is that the Chinese invention patent CN101735804A reports a blue phosphor powder for white light LED, and its chemical formula is: Ca 1- x SiO 3 :xEu 2+ , where 02 +N 2 and other dangerous reducing atmospheres, so these limit its application, and its luminous efficiency is limited

Method used

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  • A kind of blue fluorescent powder for white light LED and preparation method thereof
  • A kind of blue fluorescent powder for white light LED and preparation method thereof
  • A kind of blue fluorescent powder for white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of Sc 3.996 Ce 0.004 Al 6 Si 3 o 21 , according to the chemical formula Sc 3.996 Ce 0.004 Al 6 Si 3 o 21 The stoichiometric ratio of each element in is weighed scandium oxide Sc 2 o 3 : 2.762 grams, cerium nitrate Ce (NO 3 ) 3 ·6H 2 O: 0.018 g, aluminum oxide Al 2 o 3 : 3.059 g, silicon dioxide SiO 2 : 1.803 g, ground and mixed in an agate mortar, pre-calcined in an air atmosphere, the pre-calcined temperature is 400 ° C, the pre-calcined time is 8 hours, then cooled to room temperature, the sample is taken out, fully ground and mixed uniformly, in the Activated carbon powder is calcined in a reducing atmosphere of CO generated by combustion. The calcination temperature is 1200°C, and the calcination time is 10 hours. After cooling to room temperature, the sample is taken out, ground and mixed evenly to obtain phosphor.

[0036] See attached figure 1 , which is the X-ray powder diffraction pattern of the material sample prepared according to...

Embodiment 2

[0042] Preparation of Sc 3.96 Ce 0.04 Al 6 Si 3 o 21 , according to the chemical formula Sc 3.96 Ce 0.04 Al 6 Si 3 o 21 The stoichiometric ratios of the elements in the 3 ) 3 ·3H 2 O: 3.762 grams, cerium oxide CeO 2 : 0.023 g, alumina Al 2 o 3 : 1.020 g, silicon dioxide SiO 2 : 0.601 g, ground and mixed in an agate mortar, pre-calcined in an air atmosphere, the pre-calcined temperature is 100 ° C, the pre-calcined time is 10 hours, then cooled to room temperature, the sample is taken out, fully ground and mixed uniformly, in the composition 95% N 2 +5%H 2 Calcined in a mixed gas of 800° C. for 12 hours, cooled to room temperature, took out the sample, ground and mixed evenly to obtain phosphor.

[0043] The main structural properties, sample morphology, excitation spectrum, luminescence spectrum and decay curve of the sample prepared in this example are similar to those in Example 1.

Embodiment 3

[0045] Preparation of Sc 3.4 Ce 0.6 Al 6 Si 3 o 21 , according to the chemical formula Sc 3.4 Ce 0.6 Al 6 Si 3 o 21 The stoichiometric ratio of each element in is weighed scandium oxide Sc 2 o 3 : 0.470 g, cerium nitrate Ce (NO 3 ) 3 ·6H 2 O: 0.521 g, aluminum nitrate Al(NO 3 ) 3 9H 2 O: 4.502 g, silicon dioxide SiO 2 : 0.361 g, ground and mixed uniformly in an agate mortar, pre-calcined in an air atmosphere, the pre-calcined temperature is 600 ° C, the pre-calcined time is 3 hours, then cooled to room temperature, and the sample is taken out; fully ground and mixed uniformly, in the Activated carbon powder is calcined in a reducing atmosphere of CO generated by combustion, the calcination temperature is 1300°C, the calcination time is 4 hours, and then cooled to room temperature, the sample is taken out, ground and mixed evenly to obtain the phosphor.

[0046] The main structural properties, sample morphology, excitation spectrum, luminescence spectrum and de...

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Abstract

The invention relates to a blue fluorescent powder for white-light LED and a preparation method thereof. The chemical formula of the powder is Sc<4-4x>Al6Si3O21:4xCe<3+>; wherein in the formula, x represents the mole doping amount of rare earth activated ions (Ce3+), which are doped on the Sc3+ positions, 0.001<=x<=0.700. The prepared fluorescent powder can be well activated by the ultraviolet lights with a wavelength of 300 to 400 nanometers. The fluorescent powder can emit blue lights having a main peak at 425 nanometers, and thus the fluorescent powder can be well matched with an ultraviolet LED. The fluorescent is prepared by mixing compounds containing the required elements through a high-temperature solid-phase method or chemical synthesis method. The technology is simple and flexible, the repeatability is good, the operation is easy, the sources of the raw materials are wide, the chemical stability and thermal stability of the obtained products are both very good, crystallizing property of the synthesized fluorescent powder is good, the morphology is regular, the particle size is uniform, the luminescent efficiency is high, and thus the fluorescent powder is suitable for the preparation of LEDs excited by ultraviolet lights or near ultraviolet lights.

Description

technical field [0001] The invention relates to a blue fluorescent material and a preparation method thereof, in particular to a blue fluorescent powder for white LEDs and a preparation method thereof, belonging to the technical field of fluorescent materials. Background technique [0002] In recent years, with the global rise of the semiconductor lighting business of light-emitting diodes (LEDs), white LEDs and various colored LEDs have attracted great attention as a new generation of light sources. Compared with traditional incandescent lamps and fluorescent lamps, this fourth-generation lighting source has many advantages such as durability, no pollution, stable performance, short response time, and high efficiency. At present, the combination of ultraviolet LED chips and three primary color phosphors has the best color rendering performance, and the color temperature can be matched arbitrarily in the range of 2500-10000K. Photochromic fluorescent materials with different...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80
CPCY02B20/00
Inventor 乔学斌
Owner 徐州博创建设发展集团有限公司
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