Garnet-form aluminosilicate fluorescent powder, preparation method thereof and light-emitting device including same

Abstract

The invention discloses garnet-form aluminosilicate fluorescent powder. The chemical formula of the garnet-form aluminosilicate fluorescent powder is (Lu1-x-yLnxCey)aMgbAlcSidOe, wherein a is more than or equal to 1.8 and less than or equal to 2.2, b is more than or equal to 1.8 and less than or equal to 2.1, c is more than or equal to 1.8 and less than or equal to 2.2, d is more than or equal to1.8 and less than or equal to 2.1, e is more than or equal to 1.8 and less than or equal to 2.2, Ln represents one or more of Sc, Y, Gd and La in any proportion, x is more than or equal to 0 and lessthan or equal to 0.15, and y is less than or equal to 0.08. The prepared fluorescent powder has a crystal structure of yttrium aluminum garnet, can be optically excited by light with a wave length less than 520nm and can emit visual light with a peak value from 560nm to 590nm. Besides, the invention further discloses a preparation method of the fluorescent powder and a light-emitting device including the fluorescent powder.

Description

technical field [0001] The invention belongs to the field of rare earth luminescent materials, and relates to a garnet-type phosphor and a preparation method thereof and a light-emitting device containing the same, more specifically, to a garnet-type phosphor that can be strongly excited by violet-blue light to produce relative YAG:Ce 3+ Yellow-orange garnet-type aluminosilicate fluorescent powder with a red-shifted emission peak, a preparation method thereof, and a light-emitting device comprising the same. Background technique [0002] In recent years, white light LED has been widely concerned and researched because of its advantages that other traditional light sources cannot match, such as high energy efficiency, low operating voltage, long life, low pollution, and high stability. At present, the most mature white light LED preparation technology is the photoconversion method coated with phosphor powder. Therefore, the performance of phosphor powder plays a vital role in...

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Problems solved by technology

After it is packaged with the blue LED chip, although the color temperature is reduced, the disadvantage is that the color rendering index is low (76), and the quantum efficiency (about 60%) of the phosphor is not high

In addition, Katelnikovas et al. in YAG:Ce 3+ Based on the method of replacing Al-Al with Mg-Si, a new type of Y with a main emission peak around 600nm was synthesized. 3 Mg 2 AlSi 2 o 12 : Ce 3+ Phosphor powder (non-patent document 2), can compensate YAG:Ce 3+ Insufficient in the red light region, however, its thermal quenching performance is relatively poor, which is far from practical application

In addition, Pan Zaifa et al. in YAG:Ce 3+ The new orange Y 2 Mg 2 Al 2 Si 2 o 12 : Ce 3+ Phosphor powder (non-patent document 3), although the color rendering index is improved, but there are also defects such as relatively poor thermal quenching performance and low quantum efficiency.

Aiming at the problem of improving the thermal quenching performance, Wang Yuhua et al. 3+ On the basis of Mg-Si instead of Al-Al, a Lu with higher thermal quenching performance than commercial yellow powder was synthesized. 3 MgAl 3 SiO 12 : Ce 3+ Yellow powder (non-patent document 4), although the phosphor is relatively LuAG:Ce 3+ The red shift has been successfully realized, and the emission peak wavelength is around 560nm. However, due to the insufficient red shift range, the white light produced by matching with the blue light chip still has the problem of high color temperature (about 5500K).

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