Red phosphor suitable for ultraviolet light excitation, and preparation method thereof

A technology of red phosphor powder and ultraviolet light, applied in the field of red phosphor powder and its preparation, can solve the problems of lack of red phosphor powder and the like

Inactive Publication Date: 2013-03-27
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the practical problem that red fluorescent powder that can be effectively excited by ultraviolet light is very scarce in the research and development of ultraviolet light-based LEDs, and to provide a new type of cheap red fluorescent powder suitable for ultraviolet light excitation and its preparation method

Method used

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  • Red phosphor suitable for ultraviolet light excitation, and preparation method thereof
  • Red phosphor suitable for ultraviolet light excitation, and preparation method thereof
  • Red phosphor suitable for ultraviolet light excitation, and preparation method thereof

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preparation example Construction

[0025] The present invention also provides a preparation method for the above-mentioned red fluorescent powder suitable for ultraviolet light excitation, comprising the following steps:

[0026] a. Using oxides, fluorides, carbonates, and nitrates containing Ba, Mn, R, Ce, and Si respectively as raw materials, according to the chemical formula (Ba 9-y mn y )(R 2-x Ce x ) (SiO 4 ) 6 Calculation of the stoichiometric ratio of each substance in (0.005≤x≤0.25, 0.01≤y≤0.6) Weigh the above-mentioned raw materials, fully grind and mix them in an agate mortar;

[0027] b. Put the above mixture into a corundum crucible, under CO or H 2 Calcination under reducing atmosphere, calcination temperature is 1100-1350 ℃, calcination time is 2-5 hours, after natural cooling, grind to obtain the above-mentioned red fluorescent powder based on ultraviolet (UV) light excitation.

[0028] Preferably, the Ba is selected from BaO, BaCO 3 , Ba(NO3) 2 One of or BaO, BaF 2 、BaCO 3 , Ba(NO3) 2...

Embodiment 1

[0034] Preparation of Ba 9 sc 2 (SiO 4 ) 6 Phosphor.

[0035] Weigh BaCO according to stoichiometric ratio 3 1.7761 g, Sc 2 o 3 0.1379 g, SiO 2 0.3605 g, mixed and ground evenly in an agate mortar, put into a corundum crucible, covered, placed in a high-temperature furnace, and roasted at 1220°C for 3 hours under the condition of carbon monoxide or hydrogen reducing atmosphere; after natural cooling, grind, i.e. get Ba 9 sc 2 (SiO 4 ) 6 Phosphor. figure 1 The a curve in the diamond structure Ba 9 sc 2 (SiO 4 ) 6 XRD diffraction pattern of crystals (PDF # 82-1119).

Embodiment 2

[0037] Preparation (Ba 8.90 mn 0.10 )(Sc 1.70 Y 0.295 Ce 0.005 ) (SiO 4 ) 6 Phosphor.

[0038] Weigh BaCO according to stoichiometric ratio 3 1.7563 g, MnCO 3 0.0115 g, Sc 2 o 3 0.1172 g, Y 2 o 3 0.0333 g, CeO 2 0.0009 g, SiO 2 0.3605 g, mixed and ground evenly in an agate mortar, put into a corundum crucible, covered, placed in a high-temperature furnace, and roasted at 1180°C for 4 hours under a carbon monoxide or hydrogen reducing atmosphere; after natural cooling, grind, That is to say (Ba 8.90 mn 0.10 )(Sc 1.70 Y 0.295 Ce 0.005 ) (SiO 4 ) 6 Phosphor. Under the excitation of 327nm, the red phosphor powder prepared in this embodiment, Mn 2+ The emission wavelength is 612nm.

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Abstract

The invention provides a red phosphor suitable for ultraviolet light excitation, and a preparation method thereof, and belongs to the field of luminescent technology. A chemical formula of the red phosphor is (Ba9-yMny)(R2-xCex)(SiO4)6, wherein R represents two of Lu, Y and Sc or one of Lu or Y; and x and y are molar fractions, wherein x value is equal to or larger than 0.005 but smaller than or equal to 0.25; and y value is equal to or larger than 0.01 but smaller than or equal to 0.6. An oxide, a fluoride, a carbonate and a nitrate which contain Ba, Mn, R and Ce respectively and a Si oxide are used as raw materials; and the phosphor is obtained by the steps of grinding the above materials; mixing the materials uniformly; putting the mixture in a crucible; high-temperature roasting under a reducing atmosphere; and cooling naturally. The phosphor can emit red light with the wavelength ranging for 570 nm to 630 nm under effective excitation of the ultraviolet light with wavelength ranging for 300 nm to 350 nm, and can be used as a red light component in a white LED excited by the ultraviolet light.

Description

technical field [0001] The invention belongs to the technical field of light emission, and in particular relates to a red fluorescent powder suitable for ultraviolet (UV) light excitation and a preparation method thereof. Background technique [0002] The successful development of high-brightness GaN blue light-emitting diodes and the resulting white LEDs are known as the biggest light source revolution since Edison invented the incandescent lamp. Compared with traditional incandescent lamps and fluorescent lamps, white LED (Light Emitting Diode) is widely used in various lighting facilities due to its advantages of high efficiency, energy saving, long life, no pollution, low working voltage, and not easy to damage, so it is considered to be an alternative A new light source for traditional lighting devices. [0003] At present, the common way to realize white LED is to apply funny yellow phosphor powder on the blue LED chip. Mixed, so that the human eye produces the visio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
CPCY02B20/181Y02B20/00
Inventor 张霞张家骅郝振东
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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