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Aluminate red fluorescent powder being suitable for excitation from near ultraviolet to blue light and preparation method thereof

A technology of red phosphor and blue light excitation, which is applied in the direction of chemical instruments and methods, luminescent materials, etc., can solve the problems that red phosphor cannot absorb effectively, the brightness of red phosphor is insufficient, and the brightness of light emission is weakened, etc., and achieves the preparation method Simple, Inexpensive, Pure Chroma Effects

Active Publication Date: 2017-07-14
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Subsequently, with the commercial red phosphor Y 2 o 3 : Eu 3+ This phenomenon has been improved, but the red phosphor cannot effectively absorb in the range from near ultraviolet to blue light, which greatly reduces the brightness of light emission, so its application is still not optimistic
[0004] Existing red phosphors have insufficient luminous brightness, unstable performance, and complicated preparation process. At present, many researchers have devoted themselves to developing high-performance red phosphors to meet the technical requirements of different application goals and improve the stability and luminescence of phosphors. Performance and continuous improvement of the preparation process has become the core idea

Method used

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  • Aluminate red fluorescent powder being suitable for excitation from near ultraviolet to blue light and preparation method thereof
  • Aluminate red fluorescent powder being suitable for excitation from near ultraviolet to blue light and preparation method thereof
  • Aluminate red fluorescent powder being suitable for excitation from near ultraviolet to blue light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Preparation of Ba 9.999 Eu 0.001 Al 2 o 13 : According to the chemical formula Ba 9.999 Eu 0.001 Al 2 o 13 The stoichiometric ratio of each element in is weighed respectively Raw materials: europium oxide Eu 2 o 3 : 0.001g, barium carbonate BaCO 3 : 9.849g, aluminum oxide Al 2 o 3 : 0.517g, ground and mixed evenly in an agate mortar, pre-calcined in air atmosphere, the pre-calcined temperature is 600°C, the pre-calcined time is 10h, then cooled to room temperature with the furnace, and the sample is taken out; the first pre-calcined The raw materials were thoroughly mixed and ground in the same way again, and the second pre-calcination was carried out in the air atmosphere. The pre-calcination temperature was 1000°C, the pre-calcination time was 1h, and then cooled to room temperature, and the sample was taken out; Grinding and mixing evenly, calcining in the air atmosphere, the calcining temperature is 1300°C, the calcining time is 1h, and then cooled to room ...

Embodiment 2

[0041] Preparation of Ba 9.5 Eu 0.5 Al 2 o 13 : According to the chemical formula Ba 9.5 Eu 0.5 Al 2 o 13 The stoichiometric ratio of each element in is weighed respectively Raw material: europium nitrate Eu(NO 3 ) 3 ·6H 2 O: 0.44 grams, barium oxide BaO: 8.03 grams, aluminum nitrate Al (NO 3 ) 3 9H 2 O: 3.75 grams, mixed evenly in an agate mortar, pre-calcined in an air atmosphere, the pre-calcined temperature is 1000 ° C, the pre-calcined time is 8h, and then cooled to room temperature with the furnace, the sample is taken out, and the pre-calcined raw material is again Thoroughly grind and mix evenly, calcined in an air atmosphere, the calcined temperature is 1100°C, the calcined time is 12h, and then cooled to room temperature to obtain powdered aluminate red phosphor.

[0042] The X-ray powder diffraction pattern, excitation spectrum, luminescence spectrum, luminescence decay curve, and SEM image of the sample prepared in this example are consistent with those...

Embodiment 3

[0044] Preparation of Ba 9 EuAl 2 o 13 : According to the chemical formula Ba 9 EuAl 2 o 13 The stoichiometric ratio of each element in is weighed respectively Raw materials: europium oxide Eu 2 o 3 : 1.76 grams, barium oxide BaO: 11.74 grams, aluminum nitrate Al(NO 3 ) 3 9H 2 O: 3.75 grams, mixed and ground in an agate mortar evenly, then pre-calcined in an air atmosphere, the pre-calcined temperature is 750°C, the pre-calcined time is 6h, and then cooled to room temperature with the furnace, the sample is taken out, and the pre-calcined raw material Mix well and grind evenly by the same method again, calcining in an air-filled atmosphere, the calcining temperature is 1200°C, the calcining time is 4h, and then cooled to room temperature to obtain powdered aluminate red phosphor.

[0045] The X-ray powder diffraction pattern, excitation spectrum, luminescence spectrum, luminescence decay curve, and SEM image of the sample prepared by the technical scheme of this embod...

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Abstract

The invention discloses an aluminate red fluorescent powder being suitable for excitation from near ultraviolet to blue light and a preparation method thereof. The chemical formula of the fluorescent powder is Ba<10-10x>Eu<10x>Al2O13, wherein Eu<3+> is an exciting ion and x is the molar ratio of Eu<3+> doping Ba<2+>, 0.0001 <= x <= 0.25. The fluorescent powder is wide in excitation wavelength, is uniform in particle dispersion, has excellent thermal stability and physical and chemical stability, and is not reacted with a packaging material and a semiconductor chip and the like. The fluorescent powder is easy to excite by light in the wave band from near ultraviolet to blue light (220-475 nm), is high in luminous intensity and luminous efficiency and has pure fluorescence chroma. During preparation, compounds, which contain elements required in synthesis of the luminescent material, are mixed according to ratio, wherein a high-temperature solid phase method or a chemical synthesis method are employed to prepare the fluorescent powder in a multi-time calcination manner. The preparation method is simple and is easy to carry out, is abundant in source of raw materials, and is low in production cost.

Description

technical field [0001] The invention relates to a fluorescent material and a preparation method thereof, in particular to an aluminate red phosphor suitable for excitation by near-ultraviolet to blue light and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] White light-emitting diode (LED) is an energy conversion device that can directly convert electrical energy into visible light energy. It is a new type of lighting display device and a red environmental lighting source. White light-emitting diode lighting equipment has the advantages of low working voltage, power saving, stable performance, small size, energy saving and environmental protection, no heat radiation, long life, strong anti-vibration and impact resistance, etc., and is widely used in indicator lights, backlights, cameras, etc. , decoration, mobile phone, indoor commercial atmosphere lighting and city night scene, stage lighting, exhibition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
CPCC09K11/7734
Inventor 乔学斌
Owner XUZHOU NORMAL UNIVERSITY
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