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A red luminescent phosphor activated by trivalent europium ions and its preparation and application

A technology of trivalent europium ions and phosphors, which is applied in the field of phosphors and red luminescent phosphors, can solve the problems of low efficiency of sulfide system, corrosion of LED chips, poor chemical stability, etc., and achieve simple and stable preparation method Good, low production cost effect

Active Publication Date: 2021-10-08
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the commercial red phosphor powder for LED is mainly Y 2 o 2 S:Eu 3+ , the red fluorescent powder is a sulfide, because sulfide is used as a raw material in the preparation process, and it needs to be calcined under a protective atmosphere or a reducing atmosphere to prevent sulfur from reacting with oxygen in the air, and the preparation method is very complicated; sulfide The system efficiency is low, the chemical stability is poor, and it is easy to generate H 2 S gas corrodes LED chips

Method used

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  • A red luminescent phosphor activated by trivalent europium ions and its preparation and application
  • A red luminescent phosphor activated by trivalent europium ions and its preparation and application
  • A red luminescent phosphor activated by trivalent europium ions and its preparation and application

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Embodiment 1

[0033] According to the chemical formula Bi 11.05 Eu 1.95 Mo 2 W 2 VO 34 The stoichiometric ratio of the elements Bi, Eu, Mo, W and V in the medium, respectively weighed bismuth nitrate Bi(NO 3 )3 ·5H 2 O: 13.4 g, europium nitrate Eu (NO 3 ) 3 ·6H 2 O: 2.174 g, ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O: 0.896 g, ammonium tungstate (NH 4 ) 10 W 12 o 41 : 1.27 g, ammonium metavanadate NH 4 VO 3 : 0.293 g. The above raw materials were respectively dissolved in dilute nitric acid solution to obtain five kinds of transparent solutions. Add oxalic acid to bismuth nitrate solution: 14.92 grams, add oxalic acid to europium nitrate solution: 2.632 grams, add oxalic acid to ammonium molybdate solution: 0.392 grams, add oxalic acid to ammonium tungstate solution: 0.225 grams, add metavanadic acid Add oxalic acid: 1.35 g to the ammonium solution, and stir for a while to obtain a clear solution. Stir and mix the above five solutions slowly, place the obtained mixed...

Embodiment 2

[0039] According to the chemical formula Bi 10.4 Eu 2.6 Mo 2 W 2 VO 34 The stoichiometric ratio of the elements Bi, Eu, Mo, W and V in the medium, respectively weigh bismuth carbonate (BiO) 2 CO 3 0.5H 2 O: 6.74 g, europium oxide Eu 2 o 3 : 1.144 g, ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O: 0.896 g, ammonium tungstate (NH 4 ) 10 W 12 o 41 : 1.27 g, vanadium pentoxide V 2 o 5 : 0.23 g. The above raw materials were respectively dissolved in dilute nitric acid solution to obtain five kinds of transparent solutions. Add oxalic acid to bismuth carbonate solution: 4.68 grams, add oxalic acid to europium oxide solution: 1.17 grams, add oxalic acid to ammonium molybdate solution: 0.261 grams, add oxalic acid to ammonium tungstate solution: 0.15 grams, Add 0.45 g of oxalic acid to the vanadium solution, and stir for a period of time to obtain a clear solution. Mix and stir the above five solutions, place the obtained mixed solution in an oven and dry slowly, s...

Embodiment 3

[0042] According to the chemical formula Bi 12.935 Eu 0.065 Mo 2 W 2 VO 34 The stoichiometric ratio of the elements Bi, Eu, Mo, W and V in the medium, respectively weighed bismuth oxide Bi 2 o 3 : 10 grams, europium nitrate Eu (NO 3 ) 3 ·6H 2 O: 0.1 g, ammonium molybdate (NH 4 ) 6 Mo 7 o 24 4H 2 O: 1.195 g, ammonium tungstate (NH 4 ) 10 W 12 o 41 : 1.69 g, ammonium metavanadate NH 4 VO 3 : 0.293 g. The above raw materials were respectively dissolved in dilute nitric acid solution to obtain five kinds of transparent solutions. Add oxalic acid to bismuth oxide solution: 6.98 grams, add oxalic acid to europium nitrate solution: 0.07 grams, add oxalic acid to ammonium molybdate solution: 0.313 grams, add oxalic acid to ammonium tungstate solution: 0.18 grams, add metavanadic acid Add oxalic acid: 1.08 g to the ammonium solution, and stir for a period of time to obtain a clear solution. Mix and stir the above five solutions, place the obtained mixed solution in...

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Abstract

The invention discloses a red light-emitting fluorescent powder activated by trivalent europium ions and its preparation and application. The general chemical formula of the fluorescent powder is Bi 13‑13x Eu 13x Mo 2 W 2 VO 34 , where x is the europium ion Eu 3+ Doping moles, 0.005≤x≤0.2; to contain bismuth ions Bi 3+ Compounds containing europium ions Eu 3+ Compounds containing molybdenum ions Mo 6+ Compounds containing tungsten ions W 6+ Compounds containing vanadium ions V 5+ The compound as raw material is prepared by wet chemical complexation followed by calcination. The phosphor powder of the present invention has a broad excitation band in the near-ultraviolet region, pure chromaticity, and can emit red light with a peak at about 613 nanometers under the excitation of ultraviolet and near-ultraviolet light, and has high luminous efficiency and good stability. It can be applied to the preparation of luminescent lighting and display devices, and is especially suitable for manufacturing white LED lighting devices excited by near ultraviolet light.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a red luminous fluorescent powder activated by trivalent europium ions and its preparation and application, belonging to the field of inorganic luminescent materials. Background technique [0002] Lighting has an important impact on human production and life. The history of human lighting has experienced the development from fire, oil to electricity. With the development of civilization, human beings have tried various lighting methods; with the development of the semiconductor industry and new With the continuous innovation of semiconductor chips, so far, the new white LED has become a new green lighting source. Compared with traditional light bulbs (incandescent lamps), fluorescent lamps, and various steam lamps, white LEDs are all solid-state green lighting. It has a series of incomparable advantages such as high efficiency, energy saving, long life, environmental protection, etc., and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/74H01L33/50
CPCC09K11/7736H01L33/502Y02B20/00
Inventor 乔学斌王胜家赵君亚
Owner XUZHOU NORMAL UNIVERSITY
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