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White light LED (Light Emitting Diode) fluorescent powder and preparation method thereof

A phosphor powder and white light technology, applied in the field of phosphor powder, can solve problems such as incompatibilities in preparation, difficulties in achieving a color rendering index of devices above 80, and obstacles to the development of white light LED light-emitting devices.

Inactive Publication Date: 2012-02-08
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, YAG:Ce phosphor emission spectrum is between 550nm-560nm, which cannot be combined with blue light chips to produce LED devices with positive white light (x, 0.333y, 0.333) and low color warm tone (CCT≤5000K).
In addition, the half-peak width of YAG:Ce phosphor is relatively narrow, generally around 110nm, which makes it difficult for the device color rendering index to reach more than 80
Many of the above defects have hindered the development of white light LED light emitting devices

Method used

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  • White light LED (Light Emitting Diode) fluorescent powder and preparation method thereof
  • White light LED (Light Emitting Diode) fluorescent powder and preparation method thereof
  • White light LED (Light Emitting Diode) fluorescent powder and preparation method thereof

Examples

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Embodiment 1

[0020] In this embodiment, the chemical formula of the white LED phosphor is: Sr 2.9 MgSiO 7 :0.1Tb 3+ , which can be made using the following method:

[0021] Weigh strontium carbonate Sr 2 o 3 214.06g, MgO 40.30g, SiO 2 60.08g, Tb 4 o 7 18.69 g. In addition according to Sr 2 o 3 , MgO, SiO 2 , Tb 4 o 7 2% of the total mass is added with sodium fluoride NaF as a flux, according to Sr 2 o 3 , MgO, SiO 2 , Tb 4 o 7 0.05% of the total mass is added to LiNO 3 as a charge compensator. Mix and grind the above raw materials in a forced mixer for 30 minutes, put them into a calcined alumina crucible, and put them into a high-temperature furnace for heating. Inlet volume ratio N 2 :H 2 =3:1 reducing atmosphere, heat at 1000°C for 2 hours, then heat up to 1400°C for 10 hours. Keep the reducing atmosphere until it cools down naturally, crush it with a jet mill, soak the crushed powder in dilute nitric acid with pH=1 and stir and wash for half an hour. Then wash ...

Embodiment 2

[0023] In this embodiment, the chemical formula of the white LED phosphor is: Sr 2.8 MgSiO 7 :0.2Tb 3+ , which can be made using the following method:

[0024] Weigh strontium carbonate Sr 2 o 3 206.68g, MgO 40.30g, SiO 2 60.08g, Tb 4 o 7 28.04g. In addition, according to the aforementioned Sr 2 o 3 , MgO, SiO 2 , Tb 4 o 7 2% of the total mass is added with sodium fluoride NaF as a flux, according to the aforementioned Sr 2 o 3 , MgO, SiO 2 , Tb 4 o 7 0.05% of the total mass of LiNO was added 3 as a charge compensator. After mixing and grinding for 30 minutes, put it into an alumina crucible, and then put it into a high-temperature furnace for heating. Introduce pure hydrogen as a reducing atmosphere, heat at 1000°C for 2 hours, then heat up to 1650°C for 5 hours. Keep the reducing atmosphere until it cools down naturally, crush it with a jet mill, soak the crushed powder in dilute nitric acid with pH=1 and stir and wash for half an hour. Then wash sever...

Embodiment 3

[0026] In this embodiment, the chemical formula of the white LED phosphor is: Sr 2.75 MgSiO 7 :0.25Tb 3+ , which can be made using the following method:

[0027] Weigh strontium carbonate Sr 2 o 3 202.98g, MgO 40.30g, SiO 2 60.08g, Tb 4 o 7 46.73 g. In addition, according to the aforementioned Sr 2 o 3 , MgO, SiO 2 , Tb 4 o 7 2% of the total mass is added with sodium fluoride NaF as a flux, according to the aforementioned Sr 2 o 3 , MgO, SiO 2 , Tb 4 o 7 0.05% of the total mass of LiNO was added 3 as a charge compensator. After mixing and grinding for 30 minutes, put it into an alumina crucible, and then put it into a high-temperature furnace for heating. Introduce pure carbon monoxide as a reducing atmosphere, heat at 1000°C for 2 hours, then heat up to 1640°C for 8-10 hours. Keep the reducing atmosphere until naturally cooled, then pulverize with a jet mill, soak the pulverized powder in dilute nitric acid with pH=1 and stir and wash for half an hour. ...

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Abstract

The invention relates to white light LED (Light Emitting Diode) fluorescent powder with a chemical formula Sr(3-x)MgSiO7:xTb<3+>, wherein x is more than or equal to 0.01 and less than or equal to 0.25. The invention also provides a preparation method of the white light LED fluorescent powder. The preparation method comprises the following steps of: weighing silicon dioxide, magnesia, strontium carbonate and tetraterbium heptoxide; adding a charge compensator and a fusing assistant; mixing and grinding the raw materials; and feeding the mixture in a roasting crucible for roasting; cooling, crushing, washing and sieving to obtain the white light LED fluorescent powder. The white light LED fluorescent powder disclosed by the invention has the advantages of low price of raw materials, simple synthetic method, low loss of equipment, no need of special high-temperature equipment and the like.

Description

technical field [0001] The invention belongs to the field of fluorescent powder, and in particular relates to a white light LED fluorescent powder and a preparation method thereof. Background technique [0002] As a new generation of green and environmentally friendly solid-state lighting green light source, light-emitting diodes have low energy consumption, long life, small size, very stable structure, good light directivity, fast response, no radiation, and are suitable for harsh environments. At present, the main means of producing white light in light-emitting diodes (LEDs) is to excite YAG:Ce phosphor powder with blue light chips. But the emission spectrum of YAG:Ce phosphor is between 550nm and 560nm, so it cannot be combined with blue light chips to produce LED devices with positive white light (x, 0.333y, 0.333) and low color warm tone (CCT≤5000K). In addition, the half peak width of YAG:Ce phosphor is relatively narrow, generally around 110nm, which makes it diffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79H01L33/50
CPCY02B20/181Y02B20/00
Inventor 毕自贵
Owner IRICO
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