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Borate-based red fluorescent powder used for white light LED and preparation method thereof

A technology of red fluorescent powder and borate, which is applied in the direction of chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems that the luminous efficiency cannot meet the actual needs, the preparation process is complicated, the reaction conditions are harsh, and the experimental conditions are met. Easy to control, easy to obtain raw materials, and low synthesis temperature

Inactive Publication Date: 2013-09-25
NANCHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the operation of the preparation process is too complicated, and the reaction conditions are also very harsh, resulting in higher production costs.
In contrast, Eu 3+ Doping molybdenum (tungsten) phosphor materials can reduce production costs, but the absorption efficiency of this type of material is not high in the near ultraviolet and blue light regions, which eventually leads to its luminous efficiency not meeting actual needs

Method used

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  • Borate-based red fluorescent powder used for white light LED and preparation method thereof
  • Borate-based red fluorescent powder used for white light LED and preparation method thereof
  • Borate-based red fluorescent powder used for white light LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] According to chemical formula La 1.4 CaB 8 o 16 :0.6Eu 3+ The molar ratio of each element in, weigh 22.8066 g of La 2 o 3 (0.0700mol), 10.0087 g of CaCO 3 (0.1000mol), 50.9504 g of H 3 BO 3 (0.8240mol) and 10.5578 g of Eu 2 o 3 (0.0300mol), the above raw materials are all analytically pure, mix the above raw materials evenly, put them into a corundum crucible, put them in a sintering furnace and raise the temperature to 450 °C at 50 °C / h, sintering time 24 h, cool to room temperature, take out and grind into The powder was put into a corundum crucible again and placed in a sintering furnace at a rate of 100 °C / h to 900 °C, the sintering time was 48 h, and the middle was taken out and ground for 3 times to obtain La 1.4 CaB 8 o 16 :0.6Eu 3+ red phosphor. The X-ray diffraction pattern of the phosphor is shown in figure 1 , excitation and emission spectra see figure 2 and image 3 . from figure 1 As you can see, La 1.4 CaB 8 o 16 :0.6Eu 3+ The phosph...

Embodiment 2

[0030] According to chemical formula La 1.6 CaB 8 o 16 :0.4Eu 3+ The molar ratio of each element in, weighed 26.0647 g of La 2 o 3 (0.0800mol), 12.8097 g of CaC 2 o 4 (0.1000mol), 51.9397 g of H 3 BO 3 (0.8400mol) and 7.0385 g of Eu 2 o 3 (0.0200mol), the above raw materials are all analytically pure, mix the above raw materials evenly, put them into a corundum crucible, put them in a sintering furnace and raise the temperature to 450 °C at 50 °C / h, sintering time 24 h, cool to room temperature, take out and grind into The powder was put into a corundum crucible again and placed in a sintering furnace at a rate of 100 °C / h to 850 °C, the sintering time was 48 h, and the middle was taken out and ground for 3 times to obtain La 1.6 CaB 8 o 16 :0.4Eu 3+ red phosphor. The X-ray diffraction pattern and fluorescence spectrum of the phosphor powder are similar to those of Example 1.

Embodiment 3

[0032] According to chemical formula La 1.6 CaB 8 o 16 :0.4Eu 3+ The molar ratio of each element in, weighed 26.0647 g of La 2 o 3 (0.0800mol), 16.4088 g of Ca(NO 3 ) 2 (0.1000mol), 29.2405 g of B 2 o 3 (0.4200mol) and 7.0385 g of Eu 2 o 3 (0.0200mol), the above raw materials are all analytically pure, mix the above raw materials evenly, put them into a corundum crucible, put them in a sintering furnace and raise the temperature to 450 °C at 50 °C / h, sintering time 24 h, cool to room temperature, take out and grind into The powder was put into a corundum crucible again and placed in a sintering furnace at a rate of 100 °C / h to 900 °C, the sintering time was 48 h, and the middle was taken out and ground for 3 times to obtain La 1.6 CaB 8 o 16 :0.4Eu 3+ red phosphor. The X-ray diffraction pattern and fluorescence spectrum of the phosphor powder are similar to those of Example 1.

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Abstract

The invention discloses a borate-based red fluorescent powder used for a white light LED. The general chemical formula of the red fluorescent powder is Ln2-xMB8O16:xEu<3+>, wherein 0.001<=x<=2, Ln is one or more elements selected from La, Y, Gd and Lu, and M is one or more alkaline earth metals selected from Ca, Sr and Ba. A preparation method of the red fluorescent powder comprises following steps: taking raw materials according to the stoichiometry of the elements Ln, Eu, M and B of the general chemical formula; mixing the raw materials uniformly and adding the mixture into a corundum crucible; placing the corundum crucible in a sintering furnace; heating the corundum crucible to a temperature of 450 to 550 DEG C at a rate of 20 to 100 DEG C / h, and sintering for 5 to 24 h; cooling and taking the mixture out of the corundum crucible; grinding the mixture into powder; adding the powder into the corundum crucible again, placing the corundum crucible in the sintering furnace; heating the corundum crucible to the temperature of 800 to 1000 DEG C at the rate of 50 to 150 DEG C / h, and sintering for 24 to 72 h; cooling and taking the mixture out of the corundum crucible; grinding the mixture; and repeating the steps above for 2 to 3 times. The red fluorescent powder of the invention can be excited by near ultraviolet or blue light to emit red fluorescence, and is suitable for the white light LED excited by a near ultraviolet or blue light LED chip. Physicochemical properties and heat stability are excellent, production technologies are simple, synthesizing temperature is low, the raw materials are easily available, and cost is low.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to fluorescent powder and a preparation method thereof. Background technique [0002] White LED has the advantages of small size, high efficiency, long life, low energy consumption, and no pollution. It is the most promising green lighting source in the 21st century and is known as the "fourth generation lighting source". At present, there are two main ways to realize white light LED by using light-converting phosphor powder. The most common and mature method is to excite yellow phosphor powder YAG:Ce with blue LED chip. 3+ , mix blue light and yellow light to produce white light. However, this method has a low color rendering index due to the lack of red components, and a cool white light is obtained. In order to obtain warm white light with a high color rendering index, the conventional method is to make up for the lack of red light component...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/00
Inventor 郭锐汤松龄谭敦强
Owner NANCHANG UNIV
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