Green phosphor activated by cerium ions

Abstract

Green phosphor activated by cerium ions is characterized in that the general chemical formula is as follows: (Ca1-x-p-q, M1x) (Sc1-y, M2y) <2> M3bO3+a+2b: Cep, M4q, wherein the M1 refers to Ba, Sr, Mg or Zn; M2 refers to Ga, Al or B; M3 presents Si or Ge, and M4 presents Y, La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb or Lu; and x is smaller than 1 and larger than 0, y is smaller than or equal to 0.1 and larger than or equal to 0, a is smaller than or equal to 3 and larger than or equal to1, b is smaller than or equal to 3 and larger than or equal to 0, p is smaller than or equal to 0.2 and larger than or equal to 0.001, and q is smaller than or equal to 0.3 and larger than or equal to 0. The green phosphor provided by the invention can emit 480-620 nm light under the excitation of 400-480 nm light, and is the green phosphor suitable for an LED (Light Emitting Diode) chip with blue light.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a green fluorescent powder activated by cerium ions that can be effectively excited by a blue LED chip. Background technique [0002] White light LED semiconductor solid-state lighting technology with high efficiency, low energy consumption and long life is considered a major breakthrough in the field of lighting and display in the 21st century, and is considered to be the fourth generation of light sources after incandescent lamps. It has low working voltage, high luminous efficiency, long life, stable performance, and no pollution. It has been highly valued by various countries and has gradually entered the practical stage. At present, there are three main ways to realize white LED. The first is to directly assemble red, green, and blue LED chips into white light. The second is to coat the blue LED chip with yellow phosphor that can be effectively exci...

AI Technical Summary

Problems solved by technology

with GaN blue LEDs and Y 3 Al 5 o 12 : Ce 3+ (YAG:Ce) yellow phosphor as a light conversion material to achieve white light has become the mainstream of white LEDs. However, due to the lack of red components, the color rendering index and high color temperature of the white LEDs produced are low. For this reason, researchers The purpose of improving the color rendering index is achieved by adding red powder to YAG:Ce, but when the color rendering index is as high as 90 or more, the intensity of the current green light band is relatively weak, so high-efficiency green light-emitting phosphors It is very important for the development and application of white light LED technology

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