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Core-surface gradient nitrogen oxide fluorescent powder, preparation method thereof and luminescent device using fluorescent powder

A technology of nitrogen oxides and light-emitting devices, which is applied in chemical instruments and methods, light-emitting materials, semiconductor devices, etc., can solve problems such as poor matching between phosphors and chips, reduced luminous intensity, and poor white light chromaticity, etc., to achieve service life Long-lasting, stable properties and high luminous efficiency

Active Publication Date: 2012-07-11
JIANGSU BREE OPTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two factors can lead to poor matching between the phosphor and the chip, and a decrease in the absorption rate, resulting in a decrease in the total luminous intensity and deterioration of the white light chromaticity.

Method used

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  • Core-surface gradient nitrogen oxide fluorescent powder, preparation method thereof and luminescent device using fluorescent powder
  • Core-surface gradient nitrogen oxide fluorescent powder, preparation method thereof and luminescent device using fluorescent powder
  • Core-surface gradient nitrogen oxide fluorescent powder, preparation method thereof and luminescent device using fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The chemical formula of the fluorescent powder product of this embodiment is Ca after analysis. 0.94 Si 2 o 2 N 2 :0.06Eu / Ba 0.94 Si 2 o 2 N 2 :0.06Eu. Its manufacturing method is to weigh CaCO respectively according to the stoichiometric ratio 3 (4N), SiO 2 (4N), Si 3 N 4 (4N), Eu 2 o 3 (4N) and BaCO 3 (4N), SiO 2 (4N), Si 3 N 4 (4N), Eu 2 o 3 (4N); Wherein, respectively add 0.5% by weight of raw material total amount CaF 2 (AR) and BaF 2 (AR) is the flux. After mixing and grinding the above raw materials evenly, put them into the molybdenum crucible, and put them in the N at 1400℃ 2 Insulated in the atmosphere for 5 hours, the resulting product was crushed, pickled to remove impurities, sieved, and dried, and the Ba 0.94 Si 2 o 2 N 2 :0.06Eu plasma sprayed on Ca 0.94 Si 2 o 2 N 2 : 0.06Eu surface, that is, the phosphor powder of the present invention. Its excitation and emission spectra are shown in figure 1 and figure 2 , it can be see...

Embodiment 2

[0051] The chemical formula of the fluorescent powder product of this embodiment is Ca after analysis. 0.94 Si 2 o 2 N 2 :0.06Eu / Sr 0.94 Si 2 o 2 N 2 :0.06Eu. Its manufacturing method is to weigh CaO (4N), SiO respectively according to the stoichiometric ratio 2 (4N), Si 3 N 4 (4N), Eu 2 o 3 (4N) and SrO(4N), SiO 2 (4N), Si 3 N 4 (4N), Eu 2 o 3 (4N); Wherein, respectively add 5% by weight of raw material total amount NH 4 Cl(AR), put the above raw materials into a molybdenum crucible after mixing and grinding evenly, at 1600°C in H 2 / N 2 Insulated in the atmosphere for 3 hours, the resulting product was crushed, pickled to remove impurities, settled and classified, dried, and the Sr 0.94 Si 2 o 2 N 2 :0.06Eu PVD on Ca 0.94 Si 2 o 2 N 2 : 0.06Eu surface, namely the phosphor powder of the present invention. Its emission spectrum see Figure 5 , it can be seen from the figure that the main emission peak wavelength of the phosphor is broadened, and the...

Embodiment 3

[0053] The chemical formula of the fluorescent powder product of this embodiment is Sr after analysis. 0.44 Ba 0.5 Si 2 o 2 N 2 :0.06Eu / Ba 0.94 Si 2 o 2 N 2 :0.06Eu. Its manufacturing method is to weigh SrCO respectively according to the stoichiometric ratio 3 (4N), BaCO 3 (4N), SiO 2 (4N), Si 3 N 4 (4N), Eu 2 o 3 (4N) and BaCO 3 (4N), SiO 2 (4N), Si 3 N 4 (4N), Eu 2 o 3 (4N); wherein, respectively add 3% by weight of NaF (AR) of the total amount of raw materials, put the above-mentioned raw materials into a molybdenum crucible after mixing and grinding evenly, and put them into a molybdenum crucible at 1550 ° C in NH 3 Insulated in the atmosphere for 4 hours, the resulting product is crushed, pickled to remove impurities, hydraulically classified, and dried, and the Ba 0.94 Si 2 o 2 N 2 :0.06Eu flame sprayed on Sr 0.44 Ba 0.5 Si 2 o 2 N 2 : 0.06Eu surface, namely the phosphor powder of the present invention. Its emission spectrum see Figure 6 ,...

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Abstract

The invention relates to core-surface gradient nitrogen oxide fluorescent powder and a preparation method thereof. The fluorescent powder has the chemical formula LxSiyOZN(2 / 3)X+(4 / 3)Y-(2 / 3)Z:wR / L'xSiyOZN(2 / 3)X+(4 / 3)Y-(2 / 3)Z:wR, wherein L is at least one of Ca and Sr, L' is at least one of Ca, Sr and Ba, and R is at least one of Eu and Ce; and X is more than or equal to 0.8 and less than or equal to 1.2, Y is more than or equal to 1.8 and less than or equal to 2.2, Z is more than or equal to 1.8 and less than or equal to 2.2, and w is more than or equal to 0.01 and less than or equal to 0.1. The preparation method comprises the following steps of: 1) mixing according to the chemical formula, adding a fluxing agent, grinding, and uniformly mixing to form two kinds of mixed materials; 2) performing high-temperature roasting on the mixed materials at reducing atmosphere; and 3) partially or totally coating the roasted product L'xSiyOZN(2 / 3)X+(4 / 3)Y-(2 / 3)Z:wR by a spraying or deposition mode on the surface of a treated roasted product LxSiyOZN(2 / 3)X+(4 / 3)Y-(2 / 3)Z:wR. The excitation and emission range of the fluorescent powder is wide and can be adjusted, the lighting effect is improved, the color gamut is widened, and the fluorescent powder can be effectively used for a white light-emitting diode (LED) with a high color rendering index.

Description

technical field [0001] The invention relates to a core-surface gradient nitrogen oxide fluorescent powder that can be effectively excited by ultraviolet, purple light or blue light, its manufacturing method and a light-emitting device made of the fluorescent powder. Background technique [0002] LED phosphor is an important part of LED light-emitting devices. At present, MSi 2 o 2 N 2 (M=Ca, Sr, Ba green phosphor has important characteristics such as high quantum efficiency (90%) and high quenching temperature, and occupies an increasingly important position in the LED phosphor market, attracting the attention of scientists and industries. [0003] The Eindhoven University of Technology in the Netherlands first introduced MSi 2 o 2 N 2 :Eu 2+ / C 3+ The luminescent properties of different alkaline earth metals in (M=Ca, Sr, Ba) were compared, and their excitation and emission spectra were studied. Nichia Chemical Corporation's patents with publication numbers CN101045...

Claims

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Application Information

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IPC IPC(8): C09K11/59H01L33/50
CPCY02B20/181Y02B20/00
Inventor 何锦华滕晓明梁超符义兵
Owner JIANGSU BREE OPTRONICS CO LTD
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