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Fluorescent powder capable of exciting white light emission and suitable for ultraviolet LED and preparation method thereof

A phosphor and LED chip technology, applied in luminescent materials, chemical instruments and methods, electrical components, etc., can solve problems such as nano-fluorescence pink drift, and achieve the effects of improving luminous efficiency, good thermal stability, and low sintering temperature

Inactive Publication Date: 2019-01-11
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a fluorescent powder suitable for ultraviolet LED excitation and white light emission and a preparation method thereof, so as to solve the defect that nano fluorescent powder is prone to color drift in the prior art

Method used

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  • Fluorescent powder capable of exciting white light emission and suitable for ultraviolet LED and preparation method thereof
  • Fluorescent powder capable of exciting white light emission and suitable for ultraviolet LED and preparation method thereof
  • Fluorescent powder capable of exciting white light emission and suitable for ultraviolet LED and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh sodium carbonate, barium carbonate, ammonium dihydrogen phosphate or diammonium hydrogen phosphate, europium trioxide, and carbonate Manganese, the above raw materials are ground and mixed in an agate mortar, then put into a corundum crucible and then put into a 2 with N 2 In a box-type furnace with a gas atmosphere of mixed gas and a temperature of 1100°C-1300°C, react at a high temperature for 3-8 hours, then naturally cool to room temperature, take it out, and grind it into powder again to obtain a finished phosphor powder. In containing CO, or H 2 with N 2 Carrying out under the gas atmosphere of the mixed gas ensures that the trivalent europium in dieuropium trioxide can be reduced to divalent europium.

Embodiment 2

[0023] Weigh 0.3180g of sodium carbonate, 1.0815g of barium carbonate, 0.6902g of ammonium dihydrogen phosphate, 0.0053g of europium trioxide, and 0.0552g of manganese carbonate, grind and mix the above raw materials in an agate mortar and put them into a corundum crucible Then put it into a box-type furnace and set it at 1200°C, react in a CO atmosphere for 6 hours, cool it down to room temperature naturally, take it out, and grind it into powder again to get the finished phosphor powder.

[0024] Thermal stability is an important indicator for evaluating the performance of phosphors. figure 1 It is the temperature-varying spectrogram of the phosphor powder obtained in Experiment 2, and the inner illustration is the curve of the emission intensity of the phosphor powder changing with the test temperature. It can be seen from the figure that as the test temperature increases, the emission intensity of the phosphor decreases slowly. When the measurement temperature rises to 100...

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Abstract

The invention relates to the technical field of fluorescent powder preparation and relates to a fluorescent powder capable of exciting white light emission and suitable for ultraviolet LED and a preparation method thereof. The method comprises the following steps: S1) respectively weighting sodium carbonate, barium carbonate, ammonium dihydrogen phosphate or diammonium hydrogen phosphate, europiumoxide and manganese carbonate at mole ratio of 0.5:(0.995-x):1:0.0025:x, milling and uniformly mixing, thereby acquiring a mixture; S2) putting the mixture into a high temperature furnace under a reducing atmosphere, standing by and reacting, thereby acquiring an initial product of fluorescent powder; S3) cooling the initial product of fluorescent powder and then milling, thereby acquiring an endproduct of fluorescent powder with a chemical formula of NaBa1-x-yPO4:Eu2+y-Mn2+x and used for coating an ultraviolet LED chip. The fluorescent powder prepared according to the invention is a singlesubstrate white light fluorescent powder, so that the re-absorption problem of multi-powder combining schemes can be avoided. Phosphate is served as the substrate of the fluorescent powder, so that the heat stability is high, the defect of color drifting phenomenon during use process caused by different heat stabilities of different powders can be further avoided, and the purposes of enhancing thestability of fluorescent powder and increasing the luminous efficiency can be achieved.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder preparation, and more specifically relates to a fluorescent powder suitable for ultraviolet LED excitation to emit white light and a preparation method thereof. Background technique [0002] White LEDs (light-emitting diodes) have the advantages of energy saving, environmental protection, and long life, and are known as the fourth generation of lighting sources. Phosphor conversion white light LED is currently the main way to achieve white light emission, that is, the LED chip is combined with a phosphor that can be effectively excited by the chip. Among them, the blue light InGaN chip and the yellow light emitting phosphor YAG: Ce 3+ The combination to obtain white light has been commercialized. This packaging method has mature technology, low cost, and high luminous efficiency of the product. However, in the above-mentioned commercial fluorescent conversion scheme, due to the lack ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71H01L33/50
CPCC09K11/7738H01L33/502Y02B20/00
Inventor 陈岩蔡敏珺曾庆光李炳乾
Owner WUYI UNIV
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