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Near ultraviolet stimulated borophosphate white light fluorescent powder and preparation method

A borophosphate and phosphor technology, which is applied to the luminescent materials for blue LEDs and the field of violet light, can solve the problems that the luminous efficiency does not reach practical application value and the synthesis temperature of silicate-based phosphors is high, and achieves easy operation and simple preparation method. , good stability

Inactive Publication Date: 2012-09-12
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kim reported Ba 3 MgSi 2 o 8 :Eu 2+ , Mn 2+ and Sr 3 MgSi 2 o 8 :Eu 2+ , Mn 2+ A series of single-matrix white light phosphors suitable for near-ultraviolet light excitation; followed by M 2 MgSi 2 o 7 :Eu 2+ , Dy 3+ (M=Ca, Sr), Ca 2 MgSi 2 o 7 :Eu 2+ , Mn 2+ and other single-matrix phosphors have been reported, but the synthesis temperature of this type of silicate-based phosphor is still high, and the luminous efficiency has not yet reached the practical application value.

Method used

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  • Near ultraviolet stimulated borophosphate white light fluorescent powder and preparation method
  • Near ultraviolet stimulated borophosphate white light fluorescent powder and preparation method
  • Near ultraviolet stimulated borophosphate white light fluorescent powder and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: KBa 0 99 BP 2 o 8 :0.01Eu 2+ Phosphor powder preparation

[0021] Potassium carbonate (K 2 CO 3 ) 0.544g, boric acid (H 3 BO 3 ) 0.486g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 1.81g, barium carbonate (BaCO 3 ) 1.55g, europium trioxide (Eu 2 o 3 ) 0.0277g, after the above-mentioned raw materials are fully ground and mixed in an agate mortar, they are molded into Φ20 thin slices on a tablet machine, put into an alumina crucible, and first burned at 600°C for 3 hours, then taken out and ground, Then put it into an alumina crucible. Before heating, the air in the furnace should be driven out by vacuuming, and then burned at 900°C for 3 hours under a carbon monoxide atmosphere. Wash and finally get the sample. The sample is excited under 365nm ultraviolet light, which mainly emits blue and white light. The room temperature excitation and emission spectra of this phosphor are shown in figure 1 .

Embodiment 2

[0022] Example 2: KBa 0.98 BP 2 o 8 :0.02Eu 2+ Phosphor powder preparation

[0023] Potassium carbonate (K 2 CO 3 ) 0.544g, boric acid (H 3 BO 3 ) 0.486g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 1.81g, barium carbonate (BaCO 3 ) 1.55g, europium trioxide (Eu 2 o 3 ) 0.0553g, the above raw materials were fully ground and mixed in an agate mortar, pressed into thin slices on a tablet machine, put into an alumina crucible, first burned at 600°C for 3 hours, then taken out and ground, and then loaded Put it into an alumina crucible, remove the air in the furnace by vacuuming before heating, then burn at 900°C for 3 hours under a carbon monoxide atmosphere, grind evenly after cooling, then crush and sieve, and wash with water and ethanol respectively, Finally got the sample. The sample is excited under 365nm ultraviolet light, which mainly emits white light.

Embodiment 3

[0024] Example 3: KBa 0.97 BP 2 o 8 :0.03Eu 2+ Phosphor powder preparation

[0025] Potassium carbonate (K 2 CO 3 ) 0.544g, boric acid (H 3 BO 3 ) 0.486g, ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) 1.81g, barium carbonate (BaCO 3 ) 1.55g, europium trioxide (Eu 2 o 3 ) 0.0829g, the above raw materials were fully ground and mixed in an agate mortar, pressed into thin slices on a tablet machine, put into an alumina crucible, first burned at 600°C for 3 hours, then taken out and ground, and then loaded Put it into an alumina crucible, remove the air in the furnace by vacuuming before heating, then burn at 900°C for 3 hours under a carbon monoxide atmosphere, grind evenly after cooling, then crush and sieve, and wash with water and ethanol respectively, Finally got the sample. The sample is excited under 365nm ultraviolet light, which mainly emits white light. The room temperature excitation and emission spectra of this phosphor are shown in figure 2 .

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Abstract

The invention relates to a single-matrix luminescent material used for a light emitting diode (LED), which outputs strong light under the stimulation of the near ultraviolet, and a preparation method thereof. The single-matrix luminescent material belongs to the field of luminescent materials. The borophosphate white light fluorescent powder has a composition formula of KBa(1-x)Eu<2+>xBP2O8, wherein x is a molar percentage coefficient of EU, which is accounted relatively to Ba, and m is more than 0 and is less than 0.1. The preparation method for the fluorescent powder comprises the following steps of: accurately weighing the raw materials according to a chemical composition formula; after the raw materials are grinded and evenly mixed, firing for 1-4h under the reducing atmosphere at the temperature of 900-1000DEG C; and smashing and screening after cooling to obtain the single-matrix luminescent material. Ray of 400-620nm can be stimulated from the fluorescent powder under the ray of 300-400nm (especially 350-370nm). The near ultraviolet stimulated borophosphate white light fluorescent powder is suitable for a near ultraviolet LED chip and has the characteristics of wide stimulating range, high luminescence luminance, simple and convenient preparation method and the like.

Description

technical field [0001] The invention relates to the field of luminescent materials for purple and blue LEDs, in particular to a borophosphate phosphor that can be excited by near-ultraviolet LEDs and a preparation method thereof. Background technique [0002] Light-emitting diode (LED) is regarded as the green lighting source in the 21st century because of its many advantages such as energy saving, environmental protection, green lighting, etc., as well as broad application prospects and potential markets. Light-converting LED is the mainstream of white light lighting development. At present, blue-light InGaN dies are usually coated with YAG:Ce 3+ Yellow phosphor to realize white LED. However, since the white light synthesized in this way is composed of the yellow fluorescence of the phosphor and the blue light of the LED, the luminous color of the device changes with the change of the driving voltage and the thickness of the phosphor coating, the color reproduction is poor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71
Inventor 柳伟段瑞景曹立新苏革苏少东
Owner OCEAN UNIV OF CHINA
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