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Borate fluorescent powder for white-light LED and preparation method of borate fluorescent powder

A borate and phosphor technology, applied in the field of borate phosphors and their preparation, can solve the problems of lack of trichromatic phosphors, color reabsorption, lumen efficiency and color rendering index effects, etc. The effect of good stability, simple manufacturing method and high color rendering index

Active Publication Date: 2012-07-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is a lack of three-color base phosphors that match the near-ultraviolet light dies, and there are color reabsorption and ratio control problems between phosphor mixtures, which greatly affect the lumen efficiency and color rendering index.

Method used

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  • Borate fluorescent powder for white-light LED and preparation method of borate fluorescent powder
  • Borate fluorescent powder for white-light LED and preparation method of borate fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1: 1.87BaO 0.92MgO 1.00B 2 o 3 :0.03Eu 2+ , 0.05Ce 3+ , 0.05Na + Phosphor powder preparation. The preparation method is as follows:

[0027] Take by weighing 1.8452 grams of barium carbonate (BaCO 3 ), 0.1854 grams of magnesium oxide (MgO), 0.5874 grams of boric acid (H 3 BO 3 ), 0.0264 grams of europium trioxide (Eu 2 o 3 ), 0.0430 grams of cerium oxide (CeO 2 ), 0.0477 g of borax (Na 2 B 4 o 7 10H 2 O), the above raw materials are analytically pure. Put the above raw material mixture in an agate mortar, add 2mL of ethanol for grinding, after grinding evenly, put it into a corundum crucible, use the nitrogen mixture containing 5-10v% hydrogen as the reducing atmosphere, and the heating rate is 20°C / min. After reaching 1000°C, bake for 10 hours and cool down to room temperature naturally. The obtained sintered product is crushed, ball milled, and sieved to obtain a powder with a particle size of 3 to 10 microns, washed twice with deionized water ...

Embodiment 2

[0029] 1.66BaO 0.95MgO 1.50B 2 o 3 :0.08Eu 2+ , 0.06Ce 3+ , 0.03Tb 3+ , 0.09Na + Phosphor powder preparation.

[0030] The preparation method is as follows:

[0031] Weigh 1.2253 grams of strontium carbonate (SrCO 3 ), 0.1915 grams of magnesium oxide (MgO), 0.8718 grams of boric acid (H 3 BO 3 ), 0.0704 grams of europium trioxide (Eu 2 o 3 ), 0.0516 grams of cerium oxide (CeO 2 ), 0.0275 grams of terbium oxide (Tb 2 o 3 ), 0.0858 g of borax (Na2 B 4 o 7 10H 2 O), the above raw materials are analytically pure. Put the above raw material mixture in an agate mortar, add 2mL of ethanol to grind, after grinding evenly, put it into a corundum crucible, use the nitrogen mixture containing 5-10v% carbon monoxide as the reducing atmosphere, and the heating rate is 10°C / min, first Sinter at 800°C for 5 hours, then bake at 1100°C for 8 hours, and cool to room temperature naturally. Heat up after grinding, and roast according to the above conditions. After the sintered p...

Embodiment 3

[0033] 1.89BaO 0.87CaO 1.3B 2 o 3 :0.02Eu 2+ , 0.02Ce 3+ , 0.05Tb 3+ , 0.07Na + Phosphor powder preparation.

[0034] The preparation method is as follows:

[0035] Weigh 1.8650 grams of barium carbonate (BaCO 3 ), 0.4354 grams of calcium carbonate (CaCO3), 0.7605 grams of boric acid (H 3 BO 3 ), 0.0176 grams of europium trioxide (Eu 2 o 3 ), 0.0172 grams of cerium oxide (CeO 2 ), 0.0457 g terbium oxide (Tb 2 o 3 ), 0.0667 g of borax (Na 2 B 4 o 7 10H 2 O), the above raw materials are analytically pure. Put the above raw material mixture in an agate mortar, add 2mL of ethanol for grinding, after grinding evenly, put it into a corundum crucible, use the nitrogen mixture containing 5-10v% hydrogen as the reducing atmosphere, and the heating rate is 5°C / min, first Sinter at 800°C for 5 hours, then bake at 1200°C for 6 hours, and cool to room temperature. After the obtained sintered product is crushed, it is finely ground with a ball mill and sieved to obtain a ...

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Abstract

The invention discloses a borate fluorescent powder for a white-light LED. The borate fluorescent powder is shown in the following chemical formulas: aMo.bNO.cB2O3: xEu<2+>, yCe<3+>, zTb<3+> and (y+z)Na<+>, wherein M is Ba or Sr, N is Mg, Zn or Ca, and a, b, c, x, y, z are respective molar fractions; the values are as follows: a is more than 1 and less than 3, b is more than 0.5 and less than 2, c is more than 0.5 and less than 2, x is more than 0.001 and less than 0.2, y is more than 0.01 and less than 0.2, z is not less than 0 and less than 0.2. The invention further discloses a preparation method of the borate fluorescent powder for the white-light LED. The borate fluorescent powder disclosed by the invention has the beneficial effects of stable performance, wide range of excitation and emission spectrum, high color rendering index, simple process, easy operation, no pollution and low cost.

Description

(1) Technical field [0001] The invention relates to a luminescent material applied to semiconductor lighting, in particular to a borate fluorescent powder that can be effectively excited by a near-ultraviolet LED chip to emit white light and a preparation method thereof. (2) Background technology [0002] Semiconductor white light-emitting diodes (light-emitting diodes, referred to as LED) is a new type of solid-state lighting device developed in the past ten years. Compared with traditional incandescent lamps and fluorescent lamps, white LEDs have the advantages of energy saving, high efficiency, long life, small size, and adjustable colors. They are called "the fourth generation of lighting sources." [0003] At present, the implementation of white light LED mainly uses blue light LED to excite fluorescent materials to emit yellow light, and the remaining blue light is transmitted and mixed with yellow light to generate white light. However, since the white light is compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/63
CPCY02B20/181Y02B20/00
Inventor 潘再法王丽丽徐娟莫卫民
Owner ZHEJIANG UNIV OF TECH
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