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A kind of red light phosphor material and preparation method thereof

A red light phosphor and raw material technology, applied in the direction of luminescent materials, chemical instruments and methods, climate sustainability, etc., can solve the problems of low color rendering index, high color temperature, and poor color rendering of white light LEDs, and achieve redness Excellent light performance, stable chemical properties, and the effect of improving light and color performance

Active Publication Date: 2022-07-12
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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  • A kind of red light phosphor material and preparation method thereof
  • A kind of red light phosphor material and preparation method thereof
  • A kind of red light phosphor 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 0.5570g of NH 4F Pour it into the agate mortar and mix, add an appropriate amount of anhydrous ethanol, fully grind it evenly, the grinding time is 70 minutes, pour the powder mixture obtained after fully grinding into a corundum ceramic crucible, and place the corundum crucible containing the powder mixture in a muffle Pre-sintering in a furnace, heating to 900° C. at a rate of 100° C. / h, holding for 5 hours, and cooling to room temperature with the furnace to obtain pre-sintered powder. The pre-sintered powder was ground for 40 minutes, and then placed in the corundum crucible again. The corundum crucible containing the pre-sintered powder was placed in a muffle furnace for high-temperature solid-phase reaction, and the temperature was raised to 1350 ° C at a rate of 250 ° C / h, and the temperature was maintained for 12 h. T...

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 0.0523g of NH 4 Pour F into an agate mortar and mix, add an appropriate amount of anhydrous ethanol, fully grind evenly, and grind for 1 hour. The powder mixture obtained after fully grinding is poured into a corundum crucible, and the corundum crucible containing the powder mixture is placed in a muffle Pre-sintering in the furnace, heating to 900° C. at a rate of 90° C. / h, holding for 6 hours, and cooling to room temperature with the furnace to obtain pre-sintered powder. The pre-sintered powder was ground for 40 minutes, and then placed in a corundum crucible again. The corundum crucible containing the pre-sintered powder was placed in a muffle furnace for high-temperature solid-phase reaction, and the temperature was raised to 1450° C. at a rate of 200° C. / h. The furnace was cooled to room temperature,...

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 is poured into the agate mortar and mixed, and an appropriate amount of anhydrous ethanol is added, and the grinding time is 1 hour. The powder mixture obtained after sufficient grinding is poured into the corundum crucible, and the corundum crucible containing the powder mixture is placed in the muffle furnace. Pre-sintered in medium, heated to 800° C. at a rate of 100° C. / h, kept for 6 hours, and cooled to room temperature with the furnace to obtain pre-sintered powder. The pre-sintered powder was ground for 45 minutes, and then placed in a corundum crucible again. The corundum crucible containing the pre-sintered powder was placed in a muffle furnace for high-temperature solid-phase reaction, and the temperature was raised to 1400 ° C at a rate of 300 ° C / h, and the temperature was maintai...

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Abstract

The invention discloses a red light fluorescent powder material and a preparation method thereof. The red light phosphor material has an apatite structure, and its general chemical formula is Sr 3‑y M y Y 7‑7x Eu 7x (BO 4 )(SiO 4 ) m (GeO 4 ) n F 2 . The preparation method is as follows: weighing the raw materials according to the chemical formula, fully grinding the raw materials uniformly in an agate mortar to obtain a reaction precursor; sintering the reaction precursor to obtain a calcined product; grinding the calcined product in an agate mortar again, and then A solid-phase reaction is performed. The present invention affects the luminescent center Eu by replacing part or all of Sr with Mg, Ca and Ba, and replacing part or all of Si with Ge. 3+ The crystal field of the ions can then adjust the photochromic properties of the red phosphors and improve the photochromic properties of the red phosphors.

Description

technical field [0001] The invention relates to a red light fluorescent powder and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] The concept of a low-carbon and environmentally friendly lifestyle has been deeply rooted in the hearts of the people. In this context, white light-emitting diodes (w-LEDs), with the advantages of mercury-free operation, high energy conversion efficiency, long lifespan, and energy saving, are developing rapidly and will gradually replace traditional incandescent and fluorescent lamps. Currently, most methods used to synthesize white light-emitting diodes (w-LEDs) are via blue-emitting InGaN chips (450-460 nm) and yellow-emitting Y 3 Al 5 O 12 :Ce 3+ (YAG:Ce 3+ ) commercial use of phosphors. The main reason is that the blue light chip excites the yellow phosphor LED, which is easy to control the color temperature, easy to package, and more accepted by the market. However...

Claims

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Application Information

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Patent Type & Authority Patents(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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