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Fluorescent powder, preparation method thereof, fluorescent powder film sheet, and fluorescent powder module structure

A technology of phosphor film and module structure, applied in the field of phosphor module structure, phosphor and its preparation, and phosphor film, can solve the problem of low color gamut, half-wave width of excitation peak, low luminous efficiency, etc. problem, to achieve the effect of high luminous efficiency, narrow half-wave width, and high color gamut value

Inactive Publication Date: 2017-04-26
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The wavelength of the light generated by the sulfide phosphor diaphragm provided by the prior art under the excitation of blue light is biased, the half-wave width of the excitation peak is wide, the luminous efficiency is low, and the color gamut value is low.

Method used

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  • Fluorescent powder, preparation method thereof, fluorescent powder film sheet, and fluorescent powder module structure
  • Fluorescent powder, preparation method thereof, fluorescent powder film sheet, and fluorescent powder module structure

Examples

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preparation example Construction

[0045] In the second aspect, the embodiment of the present invention also provides a method for preparing the above-mentioned fluorescent powder, the preparation method comprising the following steps:

[0046] Step 101, put tetraethyl orthosilicate, absolute ethanol, ammonia water, and deionized water in a molar ratio of 2-6:2-6:0.5-2:0.5-2 into a beaker, mix and stir, then heat in a water bath, and dry , to get SiO 2 Microspheres.

[0047] Step 102, add the oxide of europium into dilute nitric acid solution to dissolve, and Sr(NO 3 ) 2 , M β (CO 3 ) γ 1. Deionized water is placed in the reactor and mixed, then the mixed solution of europium oxide and dilute nitric acid solution is added to the reactor, and the mixture is evenly stirred; wherein, Sr(NO 3 ) 2 , M β (CO 3 ) γ , deionized water, and the molar ratio of the oxides of europium are 15-20:1-3:60:1-5, and M is Li, Na, K, Sr, Ba, or Zn.

[0048] Step 103, continue to add chelating agent and coupling agent in ...

Embodiment 1

[0070] This example provides a composition of SiO 2 -LiSrSiO 4 :0.06Eu 3+ Phosphor powder with a core-shell structure, which is prepared by the following method: put tetraethyl orthosilicate, absolute ethanol, ammonia water, and deionized water in a beaker with a molar ratio of 4:4:1:1 Stir at 60°C for 30min, then heat in a water bath at 28°C for 30min, and then dry in a vacuum oven at 100°C with a pressure of 98Pa for 8h to obtain SiO 2 Microspheres, ready for use; 0.18molSr(NO 3 ) 2 , 0.02molLi 2 CO 3 , 0.6mol of deionized water is placed in the reactor, and 0.03mol of Eu 2 o 3 Dissolve in 30ml of dilute nitric acid solution with a mass concentration of 45%. 2 o 3 After complete dissolution, the Eu 2 o 3 Add the mixed solution of dilute nitric acid solution into the reactor and stir evenly, further add 0.072mol citric acid and 0.036mol polyethylene glycol into the reactor, heat to 60°C, stir the mixed solution until it is transparent; then put the above SiO 2 Pla...

Embodiment 2

[0072] This example provides a composition of SiO 2 -BaSrSiO 4 :0.04Eu 3+ Phosphor powder with a core-shell structure, which is prepared by the following method: put tetraethyl orthosilicate, absolute ethanol, ammonia water, and deionized water in a beaker with a molar ratio of 4:4:1:1 Stir at 58°C for 28min, then heat in a water bath at 28°C for 31min, and further dry at 110°C in a vacuum oven at 98Pa for 9h to obtain SiO 2 Microspheres, ready for use; 0.2molSr(NO 3 ) 2 , 0.03mol BaCO 3 , 0.6mol deionized water is placed in the reactor, and 0.04molEu 2 o 3 Dissolve in 30ml of dilute nitric acid solution with a mass concentration of 35%. 2 o 3 After complete dissolution, the Eu 2 o 3 Add the mixed solution of dilute nitric acid solution into the reactor and stir evenly, further add 0.08mol ethylenediaminetetraacetic acid and 0.04mol polyethylene glycol into the reactor, heat to 50°C, stir the mixed solution until transparent; then put the above SiO 2 Place the micr...

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Abstract

The invention discloses a fluorescent powder, a preparation method thereof, a fluorescent powder film sheet, and a fluorescent powder module structure, and belongs to the field of liquid crystal display backlight film assemblies. The formula of the fluorescent powder is xSiO2-M<y>Sr<z>(SiO4)n:mEu<alpha+>, wherein 1 <= x <= 2, 1 <= y <= 2, 1 <= z <= 2, 1 <= n <= 2, 0.01 <= m <= 1, M is Li, Na, K, Sr, Ba or Zn, and alpha is 2 or 3. The fluorescent powder, under excitation of monocolor light, such as blue light, can generate light in proper wavelength. In addition, the fluorescent powder is narrow in semi-wave width of an excitation peak, has high luminous efficiency, is high in color gamut value, and can be applied as a luminescent material in a backlight film module structure of an LCD television, so that the LCD television can display color image in high color gamut.

Description

technical field [0001] The invention relates to the field of liquid crystal display backlight film components, in particular to a fluorescent powder and a preparation method thereof, a fluorescent powder diaphragm, and a fluorescent powder module structure. Background technique [0002] Phosphor powder can be used as a light-emitting material in electronic products, such as LCD TVs. In LCD TVs, high color gamut color images can display a wide range of colors, and the ability to display colors is strong. Therefore, high color gamut LCD TVs have become the mainstream of LCD TV development. Among them, the color gamut is mainly determined by the color filter and the backlight. The backlight is emitted by the backlight module structure, and the substance that can emit light in the backlight film structure is the phosphor in the phosphor film. Specifically, when monochromatic light such as blue light irradiates the phosphor film, different colors of light can be generated after ...

Claims

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Application Information

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IPC IPC(8): C09K11/02C09K11/59C09K11/79B32B27/08B32B27/30B32B27/36B32B27/38
CPCC09K11/02B32B27/08B32B27/302B32B27/36B32B27/38C09K11/7734
Inventor 宋志成刘振国李富琳
Owner HISENSE VISUAL TECH CO LTD
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