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White-light fluorescent powder as well as preparation method and application thereof

A phosphor, white light technology, applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve the problems of low color rendering index, high color temperature, complex process flow, etc., and achieve simple preparation process and thermal stability. Good, luminous effect

Inactive Publication Date: 2020-11-03
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, these two methods have their own disadvantages. The first method greatly limits the selection range of phosphors due to the requirement that the phosphors can be excited by blue light and emit yellow light at the same time, and in practical applications due to blue light Too many components, lack of red light elements lead to high color temperature, low color rendering index, and excessive blue light, easy to operate myopia, macular degeneration and other ophthalmic diseases, so the application range of this type of white light LED is limited
The latter method is due to the large number of phosphors used, so that not only the ratio of each phosphor, but also the matching between the phosphor and the UV LED chip must be considered in the process of synthesizing white LEDs. The choice of phosphor powder is also made more complicated
At the same time, due to the different attenuation life of phosphors of different colors, it will also affect the lighting effect, light color and other performances in practical applications.

Method used

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  • White-light fluorescent powder as well as preparation method and application thereof
  • White-light fluorescent powder as well as preparation method and application thereof
  • White-light fluorescent powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054]a) Clean the PTFE liner with deionized water for 10 minutes, clean the PTFE liner with acetone for 10 minutes, clean the PTFE liner with isopropanol for 10 minutes, and clean the PTFE liner with deionized water 10min, then blow dry with a nitrogen gun.

[0055] b) Weigh 336.72mg CsCl, 234.9mg SnCl 4 , 27.0 mg TeCl 4 Mix and place in the cleaned polytetrafluoroethylene liner, add 4ml of hydrochloric acid (the mass percent concentration of hydrochloric acid can be 37%), and assemble the hydrothermal kettle.

[0056] c) The hydrothermal kettle was placed in a muffle furnace, and the temperature of the muffle furnace was set at 30°C and raised to 180°C over 2 hours, kept for 10 hours, and then slowly lowered to room temperature at a cooling rate of 10°C / h.

[0057] d) Take out the hydrothermal kettle in the muffle furnace, pour off the hydrochloric acid in the liner, take out the crystals, and get Cs after grinding 2 sn 0.9 Te 0.1 Cl 6 White phosphor.

Embodiment 2

[0059] a) Clean the PTFE liner with deionized water for 10 minutes, clean the PTFE liner with acetone for 10 minutes, clean the PTFE liner with isopropanol for 10 minutes, and clean the PTFE liner with deionized water 10min, then blow dry with a nitrogen gun.

[0060] b) Weigh 336.72mg CsCl, 156.3mg SnCl 4 , 107.8 mg TeCl 4 Mix and place in the cleaned polytetrafluoroethylene liner, add 4ml of hydrochloric acid (the mass percent concentration of hydrochloric acid can be 37%), and assemble the hydrothermal kettle.

[0061] c) The hydrothermal kettle was placed in a muffle furnace, and the temperature of the muffle furnace was set at 30°C and raised to 180°C over 2 hours, kept for 10 hours, and then slowly lowered to room temperature at a cooling rate of 10°C / h.

[0062] d) Take out the hydrothermal kettle in the muffle furnace, pour off the hydrochloric acid in the liner, take out the crystals, and get Cs after grinding 2 sn 0.6 Te 0.4 Cl 6 White phosphor.

Embodiment 3

[0064] a) Clean the PTFE liner with deionized water for 10 minutes, clean the PTFE liner with acetone for 10 minutes, clean the PTFE liner with isopropanol for 10 minutes, and clean the PTFE liner with deionized water 10min, then blow dry with a nitrogen gun.

[0065] b) Weigh 336.72mg CsCl, 78.3mg SnCl 4 , 189.0 mg TeCl 4 Mix and place in the cleaned polytetrafluoroethylene liner, add 4ml of hydrochloric acid (the mass percent concentration of hydrochloric acid can be 37%), and assemble the hydrothermal kettle.

[0066] c) The hydrothermal kettle was placed in a muffle furnace, and the temperature of the muffle furnace was set at 30°C and raised to 180°C over 2 hours, kept for 10 hours, and then slowly lowered to room temperature at a cooling rate of 10°C / h.

[0067] d) Take out the hydrothermal kettle in the muffle furnace, pour off the hydrochloric acid in the liner, take out the crystals, and get Cs after grinding 2 sn 0.3 Te 0.7 Cl 6 White phosphor.

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Abstract

The invention discloses white-light fluorescent powder as well as a preparation method and application thereof, the white-light fluorescent powder is selected from at least one of substances with a chemical general formula shown in a formula I: Cs2Sn1-xTexCl6, wherein the x is greater than 0 and less than 1. The white light fluorescent powder is stable in structure and performance, simple in preparation process and good in repeatability.

Description

technical field [0001] The application belongs to the technical field of luminescent materials, and in particular relates to a white light phosphor and its preparation method and application. Background technique [0002] Light-emitting diodes (light-emitting diodes, LEDs) have become the first choice for a new generation of green lighting sources due to their low energy consumption and low environmental pollution. At present, the white light LED used in daily life emits light mainly through the combination of yellow light phosphor and blue light chip, or the combination of ultraviolet chip and red, green and blue three primary color phosphors. But at present, these two methods have their own disadvantages. The first method greatly limits the selection range of phosphors due to the requirement that the phosphors can be excited by blue light and emit yellow light at the same time, and in practical applications due to blue light Too many components and lack of red light eleme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/88H01L33/50
CPCC09K11/88H01L33/502Y02B20/00
Inventor 唐江谭智方胡满琛高亮李京徽牛广达李宇轩
Owner HUAZHONG UNIV OF SCI & TECH
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