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Phosphor and its preparation method and white LED plane light source containing phosphor

A planar light source and fluorescent powder technology, applied in the field of fluorescent powder, can solve the problems of shortening reaction sintering time, long heat preservation time, and cost reduction, and achieve the effects of shortening reaction sintering time, reducing energy consumption and cost, and low color temperature

Active Publication Date: 2012-06-27
SUZHOU SUNLIGHTS TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of long holding time, high energy consumption and high cost in the preparation of garnet-based fluorescent powder by the normal pressure sintering technology using the original formula, and to synthesize the fluorescent powder of the system by using a new fast air pressure sintering process; and By doping AlN or nano-Si in the formula 3 N 4 , under the premise of keeping the luminous efficiency and thermal stability as high as possible, the emission spectrum of the phosphor shifts to the long-wave band, making it suitable for warm white LED devices with blue InGaN-based LED chips as the excitation light source; through the sintering process In the process, external pressure is introduced, and the dual effects of pressure and high temperature are used to promote more substitution ions to enter the matrix lattice. While maintaining its excellent luminescent performance, it shortens the reaction and sintering time and reduces the cost.

Method used

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  • Phosphor and its preparation method and white LED plane light source containing phosphor
  • Phosphor and its preparation method and white LED plane light source containing phosphor
  • Phosphor and its preparation method and white LED plane light source containing phosphor

Examples

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Effect test

Embodiment 1

[0034] This example is a comparative example, adopts the material formula of original technology and prepares with the preparation step in the present invention, illustrates Si with this as a benchmark 3 N 4 The effect of the addition of AlN and AlN on the optical properties of phosphors.

[0035] 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, weighing 3.30g of Y 2 o 3 , 2.55g of α-Al 2 o 3 and 0.13g CeO 2 , the purity of the above raw materials is 99.99% or 99.9995%, namely 4N or 5N, and the chemical formula Y 2.925 Ce 0.075 Al 5 o 12 Ce in 3+ =2.5 at%.

[0036] First, put the above three raw materials into a polytetrafluoroethylene ball mill jar, add 6ml of absolute ethanol and 24g of φ3mm zirconia balls, and fully grind for 3-5 hours; the obtained precursor slurry is dried in a vacuum at 80-120°C Incubate in the box for 10-20 hours to obtain dry oxide precursors contai...

Embodiment 2

[0038] The following starting materials of 4N or 5N: Y 2 o 3 , Nano α-Al 2 o 3 , CeO 2 and submicron α-Si 3 N 4 According to chemical formula Y 2.925 Ce 0.075 Al 4.79 Si 0.21 o 11.79 N 0.21 The strict proportion of ingredients, weighing 3.30g of Y 2 o 3 , 2.44g of α-Al 2 o 3 , 0.10g Si 3 N 4 and 0.13g CeO 2 , where Ce 3+ =2.5 at%, Si 3 N 4 The relative content is 0.07mol.

[0039] Put the above four kinds of initial raw materials into a polytetrafluoroethylene ball mill jar, add 6ml of absolute ethanol 0.8 times the weight of the initial raw materials and 23.88g 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 prec...

Embodiment 3

[0041] The following starting materials of 4N or 5N: Y 2 o 3 , Nano α-Al 2 o 3 , CeO 2 and submicron α-Si 3 N 4 According to chemical formula Y 2.925 Ce 0.075 Al 4.61 Si 0.39 o 11.61 N 0.39 The strict proportion of ingredients, where Ce 3+ =2.5 at%, Si 3 N 4 The relative content is 0.13mol. 3.30g of Y 2 o3 , 2.35g of α-Al 2 o 3 , 0.18g Si 3 N 4 and 0.13g CeO 2 Prepared according to the process described in Example 2, it can be effectively excited by blue light, and the orange yellow Y with a dominant wavelength of emission at 583nm is obtained 2.925 Al 4.61 Si 0.39 o 11.61 N 0.39 : Ce phosphor.

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Abstract

The invention, relating to the technical field of phosphor, particularly discloses a phosphor represented by (M1-xRex)3Al5-ySiyO12-y-zNy+z, wherein M represents one or more elements of Y, Lu, Gd, and Tb, Re represents one or two elements of Eu, Ce and Pr, x is no larger than 0.1, y is no less than 0 and no larger than 1.0, and z is no less than 0 and no larger than 1.2, the initial raw materials comprise a pure oxide of M, a pure oxide of Re, nano alpha-Al2O3, a nitride and analytically pure HBO3 / NH4F / LiF as a sintering aid which accounts for 1 wt% of the weight of the initial raw materials, and the nitride is nano amorphous Si3N4. Compared with the prior art, by using the nano amorphous Si3N4 to introduce the Si4+-N3-bond, the synthetic phosphor can keep high luminous efficiency and thermostability while the emission spectrum is continuously red shifted.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder, in particular to a high-efficiency oxynitride-based fluorescent powder with a garnet crystal structure, a preparation method thereof, and a white LED planar light source containing the oxynitride 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. [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. There are three main wa...

Claims

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Application Information

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IPC IPC(8): C09K11/80H01L33/50
Inventor 李会利王晓君孙卓张哲娟
Owner SUZHOU SUNLIGHTS TECH
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