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a kind of EU 3+ Ion-activated red phosphor and its preparation method and application

A technology of red fluorescent powder and ions, which is applied in chemical instruments and methods, luminescent materials, semiconductor devices, etc., can solve the problems of lack of performance and low excitation efficiency, and achieve the effect of simple synthesis process, convenient operation and low equipment requirements

Active Publication Date: 2022-06-17
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The effective excitation range of existing red phosphors is mostly in the short-wave UV region, and its excitation efficiency under near-ultraviolet and blue light is low. There is a lack of red phosphors with excellent performance that can be excited by near-ultraviolet or blue LED chips on the market.

Method used

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  • a kind of EU <sup>3+</sup> Ion-activated red phosphor and its preparation method and application
  • a kind of EU <sup>3+</sup> Ion-activated red phosphor and its preparation method and application
  • a kind of EU <sup>3+</sup> Ion-activated red phosphor and its preparation method and application

Examples

Experimental program
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Embodiment 1

[0027] According to the chemical formula LiAl 0.95 Eu 0.05 VPO 7 , where x is Eu 3+ Doping Substitute Al 3+ The molar ratio, 0.001≤x≤0.1. The sample of the present invention adopts the stoichiometric ratio of elements Li, Al, Eu, P and V, respectively weighs lithium carbonate Li 2 CO 3 : 0.369 g, alumina Al 2 O 3 : 0.484 g, Europium oxide Eu 2 O 3 : 0.088 g, ammonium metavanadate NH 4 VO 3 : 1.170 g, ammonium dihydrogen phosphate NH 4 H 2 PO 4 : 1.150 g. Add acetone to the weighed raw materials for wet grinding, so as to mix evenly, the obtained mixture is calcined for the first time in an air atmosphere, the calcination temperature is 300 ° C, and the calcination time is 8 hours; The second calcination, the calcination temperature is 900 ℃, and the calcination time is 1 hour to obtain a Eu 3+ Ionically activated red phosphor.

[0028] see attached figure 1 , is the X-ray powder diffraction pattern of the sample prepared by the technical solution in Example 1...

Embodiment 2

[0033]According to the chemical formula LiAl 0.999 Eu 0.001 VPO 7 , where x is Eu 3+ Doping Substitute Al 3+ The molar ratio, 0.001≤x≤0.1. The sample of the present invention adopts the stoichiometric ratio of elements Li, Al, Eu, P and V, respectively weighs lithium hydroxide LiOH: 0.239 g, alumina Al 2 O 3 : 0.509 g, Europium oxide Eu 2 O 3 : 0.176 g, vanadium pentoxide V 2 O 5 : 0.909 g, phosphoric acid H 3 PO 4 : 0.980 g. The weighed raw materials were mixed with acetone for wet grinding, so as to mix uniformly, and the obtained mixture was calcined for the first time in an air atmosphere, the calcination temperature was 400 ° C, and the calcination time was 3 hours; the calcined samples were uniformly ground, and in an air atmosphere The second calcination, the calcination temperature is 750 ℃, and the calcination time is 5 hours to obtain Eu 3+ Ionically activated red phosphor.

[0034] The structure, morphology, excitation spectrum and emission spectrum of...

Embodiment 3

[0036] According to the chemical formula LiAl 0.9 Eu 0.1 VPO 7 , where x is Eu 3+ Doping Substitute Al 3+ The molar ratio, 0.001≤x≤0.1. The sample of the present invention adopts the stoichiometric ratio of elements Li, Al, Eu, P and V, respectively weighs lithium sulfate Li 2 SO 4 : 0.550 g, aluminum hydroxide Al(OH) 3 : 0.702 g, Europium nitrate Eu (NO 3 ) 3 ·6H 2 O: 0.456 g, vanadium pentoxide V 2 O 5 : 0.909 g, phosphoric acid H 3 PO 4 : 0.980 g. After mixing the weighed raw materials, add acetone for wet grinding, so as to mix uniformly, the obtained mixture is calcined for the first time in an air atmosphere, the calcination temperature is 450 ° C, and the calcination time is 3.5 hours; The second calcination in an air atmosphere, the calcination temperature is 830 ° C, and the calcination time is 6 hours to obtain a Eu 3+ Ionically activated red phosphor.

[0037] The structure, morphology, excitation spectrum and emission spectrum of the phosphor sample...

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Abstract

The present invention relates to a kind of Eu 3+ The ion-activated red phosphor and its preparation method and application belong to the technical field of inorganic phosphor materials, and its general chemical formula is LiAl 1‑x Eu x VPO 7 , where x is Eu 3+ Doping instead of Al 3+ The molar ratio of 0.001≤x≤0.1. The preparation method of the present invention is: according to the chemical formula LiAl 1‑x Eu x VPO 7 The stoichiometric ratio of each element in the formula is weighed, and the compound containing the ions of these elements is weighed, and the weighed raw materials are wet-milled with acetone as a grinding aid, and mixed uniformly, and then calcined twice to complete the production; this synthesis The method has the advantages of simple process, convenient operation, low requirement on equipment, energy saving and environmental protection, and the prepared powder has high luminous efficiency and good stability. After being excited by ultraviolet light to blue light, it can emit red light at about 595 nm. The Eu 3+ Ion-activated phosphors can be applied to red phosphors for white LEDs.

Description

technical field [0001] The invention relates to the technical field of inorganic fluorescent materials, in particular to a Eu 3+ An ion-activated red phosphor and its preparation method and application. Background technique [0002] With the aggravation of global environmental problems and energy shortages, energy conservation and environmental protection have become an important issue facing people today. In the field of general lighting, white LED products have become the focus of attention. It is a new type of green lighting product with advantages of high electro-optical efficiency, small volume, low power, and long life. It is considered to be a new generation of lighting sources and has a good development trend. [0003] There are two main ways for white light LEDs to generate white light: the first is to combine red, green and blue LEDs to generate white light; the second is to use LEDs to excite light-converting phosphors and mix them to form white light. There are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/70H01L33/50
CPCC09K11/7737H01L33/502
Inventor 乔学斌许臣臣王胜家王艳丽
Owner XUZHOU NORMAL UNIVERSITY