Single-matrix white-light LED fluorescent powder activated by mixed-state europium and preparation method of fluorescent powder

A single-matrix, mixed-state technology, applied in the field of phosphors, can solve the problems affecting the application, luminous efficiency, chemical stability, and the inability to meet the fluorescence and thermal stability, and can not achieve continuous tunability of luminescence, etc., to improve the color rendering index, fluorescence The effect of high thermal stability and wide excitation wavelength

Pending Publication Date: 2021-09-21
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Europium is the most active metal among the rare earth elements. At present, the disilicate La 2 Si 2 o 7 Among the phosphors used as the matrix, the only phosphor activated by europium that has been reported is La 2 Si 2 o 7 :Eu 3+ , which, although it has good luminescent properties, only behaves as Eu 3+ The character

Method used

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  • Single-matrix white-light LED fluorescent powder activated by mixed-state europium and preparation method of fluorescent powder
  • Single-matrix white-light LED fluorescent powder activated by mixed-state europium and preparation method of fluorescent powder
  • Single-matrix white-light LED fluorescent powder activated by mixed-state europium and preparation method of fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] a) According to the formula La 1.998 Si 2 O 7 : 0.002Eu 2+ / Eu 3+ (X = 0.001) of the elements in the stoichiometric ratio of ingredients, lanthanum nitrate 19.98mL 1M (La (NO 3 ) 3 ), 6.2499g orthosilicate (TEOS), 0.2mL 0.1M europium nitrate (Eu (NO 3 ) 3 ) 3g of ethanol was added, stirred and mixed uniformly, followed by addition of 0.4011g of silicon carbide (SiC), stirred and mixed uniformly, and then stirred to form a sol at 50 ~ 80 ℃;

[0037] b) the resulting sol was allowed to stand in an oven at 120 ℃ 6 hours for gel extraction grinding standby;

[0038] c) The resulting gel was placed in a box furnace under air atmosphere, temperature rise rate of 8 ℃ / min the temperature was raised from room temperature to 500 deg.] C, incubated for 6 hours, cooled to room temperature, take out the grinding, to obtain a calcined product;

[0039] d) The resulting calcined product was placed in a tube furnace, under a nitrogen atmosphere (nitrogen flow rate of ...

Example Embodiment

[0041] Example 2

[0042] In the present embodiment, on the basis of the embodiment 1, increase Eu 2+ Doping:

[0043] a) According to the formula La 1.994 Si 2 O 7 : 0.006Eu 2+ / Eu 3+ (X = 0.003) in the stoichiometric ratio of the elements compounding the 19.94mL 1M lanthanum nitrate (La (NO 3 ) 3 ) Solution, 6.2499g orthosilicate (TEOS), 0.6mL 0.1M europium nitrate (Eu (NO 3 ) 3 ) 3g was added an aqueous solution of ethanol, mixing evenly, then added 0.4011g of silicon carbide (SiC), stirred and mixed uniformly, and then stirred at 80 deg.] C to form a sol;

[0044] b) the resulting sol was allowed to stand in an oven at 120 ℃ 6 hours for gel extraction grinding standby;

[0045] c) The resulting gel was placed in a box furnace under air atmosphere, temperature rise rate of 8 ℃ / min the temperature was raised from room temperature to 500 deg.] C, incubated for 6 hours, cooled to room temperature, take out the grinding, to obtain a calcined product;

[0046] d) The resulting ca...

Example Embodiment

[0048] Example 3

[0049] In the present embodiment, on the basis of Example 2, changing the amount of Eu ion doping:

[0050] a) According to the formula La 2(1-x) Si 2 O 7 : 2xEu 2+ / Eu 3+ (X = 0.0002,0.0005,0.0008,0.0010,0.0050,0.0080,0.01) the stoichiometric ratio of the elements in the ingredients, the 19.996,19.99,19.984,19.98,19.90,19.84mL 1M lanthanum nitrate (La (NO 3 ) 3 ), 6.2499g orthosilicate (TEOS), 0.04mL, 0.1mL, 0.16mL, 0.2mL, 1mL, 1.6mL 0.1M europium nitrate (Eu (NO 3 ) 3 ) 3g of ethanol was added, stirred and mixed uniformly, followed by addition of 0.4011g of silicon carbide (SiC), stirred and mixed uniformly, and then stirred at 80 deg.] C to form a sol;

[0051] b) the resulting sol was allowed to stand in an oven at 120 ℃ 6 hours for gel extraction grinding standby;

[0052]c) The resulting gel was placed in a box furnace under air atmosphere, temperature rise rate of 8 ℃ / min the temperature was raised from room temperature to 500 deg.] C, incubated for 6 ...

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Abstract

The invention discloses a single-matrix white-light LED fluorescent powder activated by mixed-state europium and a preparation method of the fluorescent powder. The single-matrix white-light LED fluorescent powder activated by the mixed-state europium is characterized in that: La2Si2O7 is used as a matrix, Eu<2+> and Eu<3+> are mixed and doped, the chemical composition general formula of the fluorescent powder is La2(1-x)Si2O7:2xEu<2+>/Eu<3+>, x is the total mole percent of doping agents Eu<2+> and Eu<3+>, and x is larger than or equal to 0.0001 and smaller than or equal to 0.1. The La2(1-x)Si2O7:2xEu<2+>/Eu<3+> fluorescent powder shows continuous emission of blue light, green light, white light, yellow light and red light, can directly realize white light emission in cooperation with an ultraviolet light LED chip, has a good application prospect in the field of ultraviolet-based white light LED illumination, and has the advantages of good crystallinity, wide excitation wavelength, high luminous efficiency, stable chemical properties, high fluorescence thermal stability and the like.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a single-matrix white light LED fluorescent powder activated by mixed state europium and a preparation method thereof, belonging to the technical field of fluorescent powder. Background technique [0002] White LEDs have the advantages of low power consumption, high luminous efficiency, long life, and no pollution, and have been widely used in indoor and road lighting and display fields. At present, white LEDs are gradually developing from the pursuit of light efficiency to the improvement of light quality, light quality, and multi-functional applications. It is necessary to create a more comfortable, efficient, and energy-saving lighting environment, and expand functional applications such as agricultural lighting, smart lighting, and visible light communication. [0003] In order to meet the needs of a comfortable light environment and diverse lighting oc...

Claims

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Application Information

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IPC IPC(8): C09K11/79H01L33/50
CPCC09K11/77922H01L33/502Y02B20/00
Inventor 万洁琼黄晋龙吴笑含李岩
Owner SHANGHAI UNIV OF ENG SCI
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