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Oxynitride fluorescent powder, preparation method thereof and LED light source including same

A technology of LED light source and oxynitride, which is applied in the field of phosphors, can solve the problems of reduced luminous intensity and thermal stability of phosphors, and achieve the effects of increased luminous intensity and high luminous efficiency

Inactive Publication Date: 2013-04-17
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, the luminous intensity and thermal stability of the phosphor are greatly reduced (A.A.Setlur et al., Chem.Mater., 20: 6277 (2008); US Pat.0,197,443, World Pat.WO2005 / 061659, WO2006 / 050645 )

Method used

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  • Oxynitride fluorescent powder, preparation method thereof and LED light source including same
  • Oxynitride fluorescent powder, preparation method thereof and LED light source including same
  • Oxynitride fluorescent powder, preparation method thereof and LED light source including same

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Embodiment 1

[0034] It is prepared by adopting the material formula of the prior art and matching the preparation steps in the present invention, and using this as a benchmark to illustrate the influence of the addition of nano-BN on the morphology, structure and optical properties of the phosphor powder.

[0035] Step (1) Weighing raw materials. to Y 2 o 3 , Nano α-Al 2 o 3 and CeO 2 According to chemical formula Y 2.925 Ce 0.075 Al 5 o 12 The strict proportion of ingredients, weigh 3.30g of Y 2 o 3 , 2.55g of α-Al 2 o 3 , 0.13g CeO 2 and 0.06g co-solvent NH 4 F, the purity of the above raw materials is 99.99% or 99.9995%, that is, 4N or 5N, co-solvent NH 4 F is analytically pure, chemical formula Y 2.925 Ce 0.075 Al 5 o 12 Ce in 3+ = 2.5at%.

[0036] In the present invention, "pure oxides of M and Re" refer to high-purity oxides with a purity of 99.99% or 99.9995%.

[0037] Step (2), at first above-mentioned four kinds of raw materials are put into polytetrafluoroeth...

Embodiment 2

[0042] The following starting materials of 4N or 5N: Y 2 o 3 , Nano α-Al 2 o 3 , CeO 2 and nano-amorphous BN according to chemical formula Y 2.925 Ce 0.075 Al 4.7 B 0.3 o 11.7 N 0.3 The strict proportion of ingredients, weigh 3.30g of Y 2 o 3 , 2.40g of α-Al 2 o 3 , 0.07g BN, 0.13g CeO 2 and 0.06g of NH 4 F as co-solvent, where Ce 3+ =2.5at%, the relative content of BN is 0.3mol.

[0043] Put the above five kinds of initial raw materials into a polytetrafluoroethylene ball mill jar, add 5ml of absolute ethanol 0.8 times the weight of the initial raw materials and 23.8g of φ3mm zirconia balls 4 times the weight of the initial raw materials, and fully grind for 3-5 hours; The precursor slurry is placed in a vacuum drying oven at 80-120°C for 10-20 hours to obtain a dry oxide precursor containing partial agglomerates; Gently grind, pulverize, and pass through a 200-mesh sieve in a mortar, and the under-sieve is the oxide precursor; finally, put the above oxide pr...

Embodiment 3

[0046] The following starting materials of 4N or 5N: Y 2 o 3 , Nano α-Al 2 o 3 , CeO 2 and nano-amorphous BN according to chemical formula Y 2.925 Ce 0.075 Al 4.5 B 0.5 o 11.5 N 0.5 The strict proportion of ingredients, where Ce 3+ =2.5at%, the relative content of BN is 0.5mol. 3.30g of Y 2 o 3 , 2.30g of α-Al 2 o 3 , 0.12g BN, 0.13g CeO 2 and 0.06 g of co-solvent NH 4 F is prepared according to the process described in Example 2 to obtain a yellow-green Y that can be effectively excited by ultraviolet to blue light 2.925 Al 4.5B 0 . 5 o 11.5 N 0.5 : Ce phosphor.

[0047] Such as Figure 4 As shown, after adding BN with a relative content of 0.5mol, a pure garnet-structured YAG phase can still be obtained, and its grains grow further, with an average grain size of about 35 μm. Under the excitation of blue light, it emits yellow-green light with a dominant wavelength of 527nm, and the luminous intensity is equivalent to that of the sample added with 0.3m...

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Abstract

The invention discloses an oxynitride fluorescent powder, of which the structural formula is (M1-xRex) 3 (Al, Ga) 5-yByO12-yNy, wherein M is one or more elements of Y, Lu, Gd and Tb; Re is one or both elements of Ce and Pr, x is larger than 0 and smaller than or equal to 0.1, and y is larger than or equal to 0 and smaller than or equal to 1.0. The invention discloses a preparation method of the oxynitride fluorescent powder and further discloses a white-light light source including the oxynitride fluorescent powder. According to the invention, the luminescence property of YAG:Ce fluorescent powder is improved for the first time through introduction of BN, and the luminescence is enhanced while temperature rises, so that a higher luminous efficiency is provided within a larger temperature range.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder, and in particular relates to an oxynitride fluorescent powder, a preparation method thereof, and an LED light source containing the fluorescent powder. Background technique [0002] White light-emitting diode is a new type of solid-state lighting source that has developed rapidly in recent years. Compared with traditional incandescent lamps and fluorescent lamps, it has the advantages of energy saving, environmental protection, long life, small size, fast response, and impact resistance. It is known as It is the fourth-generation lighting source after incandescent lamps, fluorescent lamps and high-pressure gas discharge lamps (S. Nakamura et al., Appl. Phys. Lett., 64, 1687 (1994)). [0003] As a kind of mixed light, white light is realized through the reasonable ratio of red, green, blue and RGB colors according to the principle of three primary colors. At present, the most widely ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80H01L33/50
Inventor 李会利王晓君孙卓
Owner EAST CHINA NORMAL UNIV
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