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Ultraviolet, near ultraviolet and blue light excited red phosphor for LED and preparation method thereof

A technology excited by red phosphor powder and blue light, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of harming human health, unsuitable for promotion, high sintering temperature, etc., to save energy, facilitate industrial production, The effect of high luminous intensity

Inactive Publication Date: 2018-04-17
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, CN104818017A discloses a molybdate-based red fluorescent powder for white LEDs and a preparation method thereof. The fluorescent powder can be excited by near-ultraviolet light and blue light to obtain red light, but cannot be effectively excited by ultraviolet light.
And CN106978173A discloses a kind of orthosilicate-based red fluorescent powder and its preparation method, the fluorescent powder can be activated by ultraviolet light and near ultraviolet light, but the sintering temperature required by the high temperature solid phase method it adopts is too high, energy consumption Too large, and the sol-gel method involves toxic substances, which is harmful to human health and is not suitable for promotion
Bismuth ions overlap well with the absorption range of europium ions due to their emission spectrum, and co-doped bismuth ions can effectively sensitize europium ions and improve the intensity of red light, so they are more widely used. For example, CN104004518A discloses a europium / bismuth co- Doped CaWO 4 The preparation method of red fluorescent powder can be excited by blue light and near ultraviolet light, CN106497564A discloses a kind of red fluorescent powder, its general chemical formula is Sr 3 Ga 2 Ge 4 o 14 :xEu 3+ , yBi 3+ , the phosphor can be effectively excited by near-ultraviolet light, but it is difficult to be simultaneously excited by ultraviolet light and near-ultraviolet light

Method used

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  • Ultraviolet, near ultraviolet and blue light excited red phosphor for LED and preparation method thereof
  • Ultraviolet, near ultraviolet and blue light excited red phosphor for LED and preparation method thereof
  • Ultraviolet, near ultraviolet and blue light excited red phosphor for LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0020] According to the chemical formula Ba 0.978 SiO 3 :0.01Eu 3+ , 0.001Bi 3+ , 0.011K + The stoichiometric ratio of each element in the 3 ) 2 (A.R.), Bi(NO 3 ) 3 ·5H 2 O, Eu 2 o 3 (99.99%), KNO 3 (A.R.), measure Si(OC 2 h 5 ) 4 (A.R.); Prepare Precipitant (NH 4 ) 2 C 2 o 4 +NH 3 ·H 2 O solution, the concentration is 3mol / L; firstly, the measured Si(OC 2 h 5 ) 4 Add it into an appropriate amount of ultrapure water, add a small amount of concentrated nitric acid dropwise, and then heat it in a water bath to 40°C to decompose it, and at the same time, weigh the Eu 2 o 3 Dissolve with an appropriate amount of concentrated nitric acid, add a small amount of ultrapure water to prepare a europium nitrate solution; then mix the above two solutions evenly, and add the weighed KNO 3 , Ba(NO 3 ) 2 , Bi(NO 3 ) 3 ·5H 2 O, stir for a certain period of time to fully dissolve and mix; add a precipitant dropwise, adjust pH = 9, and continue stirring for 4 hou...

Embodiment example 2

[0022] According to the chemical formula Ba 0.97 SiO 3 :0.01Eu 3+ , 0.005 Bi 3+ , 0.015K + The stoichiometric ratio of each element in the 2 (A.R.), Bi 2 o 3 、Eu2 o 3 (99.99%), KCl, measure Si(OC 2 h 5 ) 4 (A.R.); Prepare Precipitant (NH 4 ) 2 C 2 o 4 +NH 3 ·H 2 O solution, the concentration is 2mol / L; firstly, the measured Si(OC 2 h 5 ) 4 Add it into an appropriate amount of ultrapure water, add a small amount of concentrated hydrochloric acid dropwise, and then heat it in a water bath to 50°C to decompose it, and at the same time weigh the Eu 2 o 3 、 Bi 2 o 3 Dissolve with an appropriate amount of concentrated hydrochloric acid, add a small amount of ultrapure water to prepare a chloride solution; then mix the above two solutions evenly, and add weighed KCl and BaCl 2 , stir for a certain period of time to fully dissolve and mix; add a precipitant dropwise, adjust pH = 8, and continue to stir for 3 hours; directly dry, then pre-calcine at 700 ° C for...

Embodiment example 3

[0024] According to the chemical formula Ba 0.96 SiO 3 :0.01Eu 3+ , 0.01Bi 3+ , 0.02K + The stoichiometric ratio of each element in the 3 ) 2 (A.R.), Bi(NO 3 ) 3 ·5H 2 O, Eu 2 o 3 (99.99%), KNO 3 (A.R.), measure Si(OC 2 h 5 ) 4 (A.R.); Prepare Precipitant (NH 4 ) 2 C 2 o 4 +NH 3 ·H 2 O solution, the concentration is 1mol / L; firstly, the measured Si(OC 2 h 5 ) 4 Add it into an appropriate amount of ultrapure water, add a small amount of concentrated nitric acid dropwise, and then heat it in a water bath to 60°C to decompose it, and at the same time weigh the Eu 2 o 3 Dissolve with an appropriate amount of concentrated nitric acid, add a small amount of ultrapure water to prepare a europium nitrate solution; then mix the above two solutions evenly, and add the weighed KNO 3 , Ba(NO 3 ) 2 , Bi(NO 3 ) 3 ·5H 2 O, stir for a certain period of time to fully dissolve and mix; add a precipitant dropwise, adjust pH = 7, and continue to stir for 2 hours; d...

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Abstract

The invention discloses a red fluorescent powder excited by ultraviolet, near ultraviolet and blue light for LEDs and a preparation method thereof, belonging to the technical field of luminescent materials, and its chemical formula is Ba1‑2x‑2ySiO3:xEu3+, yBi3+, (x+y)K+, where 0.01≤x≤0.1, 0

Description

technical field [0001] The invention belongs to the technical field of LED luminescent materials, and in particular relates to a metasilicate-based red fluorescent powder excited by ultraviolet, near ultraviolet and blue light and a preparation method thereof. Background technique [0002] White LED lighting is called the fourth-generation lighting source, which can be widely used in various lighting facilities and has a tendency to replace traditional lighting. At present, the realization of white light LED is that the blue light GaInN chip excites YAG (Y 3 al 5 o 12 : Ce 3+ ) Phosphor powder produces yellow light, which mixes with chip blue light to form white light. Due to the lack of red light components in the emission spectrum of YAG phosphors, there are defects such as low color rendering index and high color temperature, some commonly used rare earth activated sulfide red phosphors (CaS:Eu 2+ ; Ca 1-x Sr x S:Eu 2+ etc.) Although they can make up for the defic...

Claims

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Application Information

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IPC IPC(8): C09K11/59H01L33/50
CPCC09K11/7734H01L33/502
Inventor 朱达川杨灵翔
Owner SICHUAN UNIV
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