Red and orange light fluorescent powder with garnet structure and preparation method thereof

Abstract

The invention discloses a red and orange light fluorescent powder with garnet structure. The fluorescent powder has a chemical expression of Mg2-xAxY2-y-cByAl2+z-aCaSi2-z-bDbO12-zEz:cCe<3+>, wherein A represents one or more than two selected from Ba, Sr and Ca in arbitrary proportion, B represents one or more than two selected from Gd, La and Sc in arbitrary proportion, C represents Ga, D represents Ge, E represents F or Cl, x, y,z, a, b and c represent corresponding mole fractions and satisfy the relations of: 0<=x<0.35, 0<=y<0.35, 0<z<=2, 0<=a<0.5, 0<=b<0.35, 0<c<0.2, and 2-z-b>=0. Under the excitation of blue light in wavelength of 455nm, the red and orange light fluorescent powder has emission wavelength range of 500-750 nm, wherein the main emission wavelength range is 600-621 nm, the emission spectra shows obvious redshift compared with YAG (delta S=60-80nm), and the preparation temperature is low.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a fluorescent powder applied to semiconductor lighting, in particular to an emission spectrum and YAG:Ce 3+ A red-orange fluorescent powder for white LEDs with a red shift and low preparation temperature and a preparation method thereof. Background technique [0002] At present, the implementation of WLED mainly uses blue LED to excite the phosphor to emit yellow light, and the remaining blue light is transmitted and mixed with the yellow light emitted by the phosphor to generate white light. Due to its simplicity, low cost, and high efficiency of the obtained LED devices, it has attracted much attention. Among the yellow phosphors used, Ce 3+ Ion-activated yttrium aluminum garnet (YAG:Ce 3+ ) has become the most important commercially available yellow phosphor due to its high efficiency in absorbing blue light and converting it into yellow light. Co...

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Problems solved by technology

Although this method can make up for the YAG:Ce to a certain extent 3+ The deficiency of fluorescent pink light also brings new problems: firstly, sulfide and nitride have their own shortcomings, such as the chemical stability of the former is not good, and it is harmful to the environment, while the preparation conditions of the latter are very harsh and the cost is high. Second, due to the reabsorption of emission energy between different phosphors, the emission color is unstable

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