Aftertreatment method for Sr2Si5N8: Eu<2+> fluorescent powder

A fluorescent powder and powder technology, which is applied in the field of luminescent materials, can solve the problems of reduced luminous efficiency and poor moisture resistance of fluorescent powder, and achieve the effects of increasing luminous intensity, improving photoluminescence efficiency, and low cost

Inactive Publication Date: 2016-06-01
SICHUAN LIJIU INTPROP SERVICE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to overcome the Sr that existing high-temperature solid phase reaction method synthesizes 2 Si 5 N 8 : Eu 2+ Phosphor powder has the above-mentioned shortcomings of residual substances coating the surface of particles, resulting in reduced luminous efficiency and poor moisture resistance of phosphor powder. A Sr 2 Si 5 N 8 : Eu 2+ A post-treatment method for phosphor powder, which is low in cost and simple to operate, can effectively remove the calcined residue on the surface of the coated particles, and can reduce the Zeta potential isoelectric point of the phosphor powder, improve the dispersibility of the phosphor powder and by This brings about an increase in the luminous intensity of the phosphor and an increase in the Sr 2 Si 5 N 8 : Eu 2+ Luminous efficiency of phosphor conversion light source

Method used

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  • Aftertreatment method for Sr2Si5N8: Eu&lt;2+&gt; fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Embodiment 1 A kind of Sr 2 Si 5 N 8 : Eu 2+ The aftertreatment method of fluorescent powder comprises the following steps:

[0033] (1) Pickling treatment: prepare a nitric acid solution with a concentration of 0.5mol / L, take phosphor powder and disperse it evenly in the nitric acid solution to prepare a phosphor powder suspension with a concentration of 50%, centrifuge after stirring at room temperature, and then separate the Phosphor powder was washed to pH 7.0.

[0034] (2) Surfactant solution treatment: add the fluorescent powder obtained in step (1) to 1mol / L sodium lauryl sulfate solution, prepare a fluorescent powder suspension with a concentration of 35%, centrifuge after stirring at room temperature separate.

[0035] (3) Coating treatment: mix absolute ethanol, fluorescent powder and tetraamine silicon alkoxide evenly, prepare a suspension with a concentration of 60%, and drop into the fluorescent powder suspension while stirring 8% deionized water, afte...

Embodiment 2

[0037] Embodiment 2 A kind of Sr 2 Si 5 N 8 : Eu 2+ The aftertreatment method of fluorescent powder comprises the following steps:

[0038] (1) Pickling treatment: prepare a hydrochloric acid solution with a concentration of 5mol / L, take phosphor powder and disperse it evenly in the hydrochloric acid solution to prepare a phosphor powder suspension with a concentration of 50%, centrifuge after stirring at room temperature, and then separate the phosphor powder Powder wash to pH 7.1.

[0039] (2) Surfactant solution treatment: the fluorescent powder obtained in step (1) is added to 1mol / L sodium dodecylbenzene sulfate solution, and it is prepared into a fluorescent powder suspension with a concentration of 40%, after stirring at room temperature Centrifuge.

[0040] (3) Coating treatment: mix methanol, fluorescent powder and tetraamine titanium alkoxide evenly, prepare a suspension with a concentration of 50%, and drop 10% of the weight of the fluorescent powder into the f...

Embodiment 3

[0042] Embodiment 3 A kind of Sr 2 Si 5 N 8 : Eu 2+ The aftertreatment method of fluorescent powder comprises the following steps:

[0043] (1) Pickling treatment: prepare a sulfuric acid solution with a concentration of 2mol / L, take the fluorescent powder and evenly disperse it in the sulfuric acid solution to prepare a fluorescent powder suspension with a concentration of 45%, centrifuge after stirring at room temperature, and then separate the fluorescent powder Powder wash to pH 7.2.

[0044] (2) Surfactant solution treatment: add the fluorescent powder obtained in step (1) into 0.8mol / L triethanolamine stearate solution, prepare a fluorescent powder suspension with a concentration of 35%, centrifuge after stirring at room temperature separate.

[0045] (3) Coating treatment: mix acetone, fluorescent powder and tetraamine zirconium alkoxide evenly, prepare a suspension with a concentration of 45%, and drop 7% of the fluorescent powder into the fluorescent powder suspe...

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Abstract

The invention discloses an aftertreatment method for Sr2Si5N8: Eu<2+> fluorescent powder. The aftertreatment method comprises the following steps: pickling treatment, surfactant solution treatment, coating treatment and drying and ball milling treatment. Fluorescent powder processed by the aftertreatment method has very good dispersity and moisture resistance, can be used for preparing white-light LEDs, reduce the back scattering power and improve the light extraction ratio, and is simple in process, low in cost and in favor of industrial production.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a Sr 2 Si 5 N 8 : Eu 2+ Phosphor powder post-processing method. Background technique [0002] Inorganic luminescent materials (mainly phosphors) are widely used in daily life, not only for fluorescent display tubes (VFD), field emission displays (FED or SED), plasma display screens (PDP), cathode ray tubes (CRT), Electronic fields such as white light-emitting diodes (LEDs) can also be used in biological detection / marking, plant growth regulation and other fields. These are all inseparable from the red light source, and there is an urgent need for red phosphors with good comprehensive luminous performance and high cost performance. 600-700nm red luminescent powder can be prepared from various materials, such as aluminate, silicate, tungsten / molybdate, etc., but in terms of luminous intensity, quantum efficiency, excitation and emission wavelength range, stability, etc. ,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/59C09K11/02
CPCC09K11/02C09K11/7728Y02B20/00
Inventor 不公告发明人
Owner SICHUAN LIJIU INTPROP SERVICE CO LTD
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