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Red-light fluorescent powder material and preparation method thereof

A technology for red light phosphors and raw materials, applied in the directions of luminescent materials, chemical instruments and methods, climate sustainability, etc., can solve the problems of polluting the environment, restricting the practical application of nitride-based red powder, and sintering temperature at high ammonia pressure.

Active Publication Date: 2021-06-08
SHANGHAI INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are problems with this solution: lack of effective red light components, these combinations show poor color rendering index (<80), and the visible red light spectrum is lacking, resulting in low color rendering index and high color temperature of white LEDs. Poor color rendering, showing luminescent characteristics
However, the disadvantage is obvious, the thermal stability of sulfide phosphor is poor, and it will release H 2 S and CS 2 polluted environment
Although nitride or oxynitride is considered to be a good red phosphorescent material with very good thermal stability, it requires high ammonia pressure (10MPa) and sintering temperature (>1800°C) during the synthesis process, resulting in the production of much higher cost
At the same time, nitride red powder also has the characteristics of broadband emission, low lumen efficiency, and mutual absorption, which restricts the practical application of nitride-based red powder in the field of WLED.

Method used

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  • Red-light fluorescent powder material and preparation method thereof
  • Red-light fluorescent powder material and preparation method thereof
  • Red-light fluorescent powder material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 2.0539g of SrCO with an analytical balance 3 , 5.3486g of Y 2 o 3 , 0.0842g of Eu 2 o 3 , 0.4429g of H 3 BO 3 , 2.0539g of SiO 2 and 0.5570 g of NH 4F Pour into an agate mortar and mix, add appropriate amount of absolute ethanol, fully grind evenly, and grind for 70 minutes, pour the powder mixture obtained through full grinding into a corundum ceramic crucible, and place the corundum crucible containing the powder mixture on the muffle Pre-fire in the furnace, raise the temperature to 900°C at a rate of 100°C / h, keep the temperature for 5h, and cool to room temperature with the furnace to obtain the pre-fired powder. Grind the calcined powder for 40 minutes, put it in the corundum crucible again, put the corundum crucible with the calcined powder in the muffle furnace for high-temperature solid-state reaction, raise the temperature to 1350°C at a rate of 250°C / h, keep it for 12h, then The furnace was cooled to room temperature, and the calcined product wa...

Embodiment 2

[0029] Weigh 2.0861g of SrCO with an analytical balance 3 , 5.5282g of Y 2 o 3 , 0.0871g of Eu 2 o 3 , 0.4368g of H 3 BO 3 , 2.1229g of SiO 2 , 0.4950g of CaF 2 and 0.0523 g of NH 4 Pour F into an agate mortar and mix, add an appropriate amount of absolute ethanol, fully grind evenly, grind for 1 hour, pour the powder mixture obtained through full grinding into a corundum crucible, and place the corundum crucible containing the powder mixture in a muffle Pre-fire in the furnace, raise the temperature to 900°C at a rate of 90°C / h, keep the temperature for 6h, and cool to room temperature with the furnace to obtain the pre-fired powder. Grind the calcined powder for 40 minutes, put it in the corundum crucible again, put the corundum crucible with the calcined powder in the muffle furnace for high-temperature solid-state reaction, raise the temperature to 1450°C at a rate of 200°C / h, keep it for 10 hours, and then The furnace was cooled to room temperature, and the calci...

Embodiment 3

[0031] Weigh 1.0794g of SrCO with an analytical balance 3 , 5.7206g of Y 2 o 3 , 0.0901g of Eu 2 o 3 , 0.4521g of H 3 BO 3 , 2.9165g of SiO 2 , 0.8200g of CaO and 0.5957g of NH 4 F Pour into an agate mortar and mix, add appropriate amount of absolute ethanol, fully grind evenly, grind for 1 hour, pour the powder mixture obtained through full grinding into a corundum crucible, and place the corundum crucible containing the powder mixture in a muffle furnace Medium pre-calcination, heating up to 800 °C at a rate of 100 °C / h, keeping the temperature for 6 hours, and cooling to room temperature with the furnace to obtain pre-calcined powder. Grind the calcined powder for 45 minutes, put it in the corundum crucible again, put the corundum crucible with the calcined powder in the muffle furnace for high-temperature solid-state reaction, raise the temperature to 1400°C at a rate of 300°C / h, keep it for 12 hours, and then The furnace was cooled to room temperature, and the cal...

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Abstract

The invention discloses a red-light fluorescent powder material and a preparation method thereof. The red-light fluorescent powder material has an apatite structure, and the chemical general formula of the red-light fluorescent powder material is Sr<3-y>MyY<7-7x>Eu<7x>(BO4) (SiO4)m(GeO4)nF2. The preparation method comprises the following steps: weighing raw materials according to the chemical formula, and fully and uniformly grinding the raw materials in an agate mortar to obtain a reaction precursor; sintering the reaction precursor to obtain a pre-sintered product; and grinding the pre-sintered product in an agate mortar again, and then carrying out solid-phase reaction. According to the invention, Mg, Ca and Ba are adopted to replace part or all of Sr, and Ge is adopted to replace part or all of Si, so that a crystal field of Eu < 3 + > ions in a luminescence center is influenced, and the photochromic performance of the red fluorescent powder can be adjusted and improved.

Description

technical field [0001] The invention relates to a red fluorescent powder and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] The concept of low-carbon and environmentally friendly lifestyle has been deeply rooted in the hearts of the people. Against this background, white light-emitting diodes (w-LEDs), which have the advantages of mercury-free operation, high energy conversion efficiency, long lifetime, and energy saving, are rapidly developing and will gradually replace traditional incandescent and fluorescent lamps. Currently, most methods for synthesizing white light-emitting diodes (w-LEDs) are through blue-emitting InGaN chips (450-460nm) and yellow-emitting Y 3 al 5 o 12 : Ce 3+ (YAG:Ce 3+ ) combination of phosphors for commercial use. The main reason is that LEDs with yellow phosphors excited by blue light chips are easy to adjust the color temperature and easy to package, and are more accep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/86
CPCC09K11/7797Y02B20/00
Inventor 张彦龚震王占勇徐家跃刘家文黄礼武单伟毅
Owner SHANGHAI INST OF TECH
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