Red luminescence phosphor

Abstract

The invention relates to a red luminous fluorescent powder, the formula of which is MM'aAlbOd:Mnx,Ry, wherein M is at least one of Li, Na, K, Rb, Zr, Ce and Hf, M' is at least one of Si, B, P, F, Cl and Br, R is at least one of Eu, Sm, Dy, Nd, Pr, Ho, Er, Bi and Cr and 0<=a<=10, 0.1<=b<=12, 1<=d<=25, 0.0001<=x<=0.5 and 0<=y<=0.5. The red luminous fluorescent powder in the invention is a composite oxide, prepared in high-temperature solid-phase method. The substrate contains no toxic or hazardous chemical components such as precious rare earth, cadmium and sulfer. The invention has the advantages of simple preparing process, low production cost, stable chemical properties, good luminous performance, high thermal-stability, wide excitation wavelength and capable of being effectively excited by ultraviolet light, purple light or blue light LED etc. The invention can be widely used in white light LED.

Description

technical field [0001] The invention relates to a red light-emitting fluorescent powder, in particular to a fluorescent powder which can be effectively excited by ultraviolet light, purple light or blue light LED to produce red light emission. Background technique [0002] White light-emitting diode (W-LED, white-light-emitting diode) as a junction semiconductor electroluminescent device, has low operating voltage, low power consumption, light weight, small size, long life, no radiation, no pollution, A series of advantages such as fast luminous response, shock resistance and safety have attracted much attention, and it is called the fourth generation of solid cold light source. At present, white light LEDs mainly realize white light through two ways: one is the fluorescent conversion type, that is, a single LED chip is combined with a phosphor to emit light; the other method is to use a combination of red, green, and blue LED chips to emit light. [0003] As a new generati...

AI Technical Summary

Problems solved by technology

At present, the UV LED technology is still immature, and the existing red phosphor has poor excitation performance in the violet or blue LED light-emitting band, and the luminous efficiency is low, which has become a bottleneck for the development of LED phosphors and even white LEDs.

The red phosphors that have been developed for LED mainly contain Ca 3 (VO4) 2 :Eu 3+ 、YVO 4 :Eu 3+ , Y 2 o 3 :Eu 3- , Bi 3+ , Y 2 o 2 S:Eu 3+ , CaO:Eu 3+ 、CaMoO 4 :Eu 3+ , (Gd, Y, Eu) 2 (MoO 4 ) 3 :Sm 3+ , (Sr, Ca)S:Eu 2+ , Ca 5 (SiO 4 ) 2 Cl 2 :Eu 2+ 、Sr 2 Si 5 N 8 :Eu 2+ etc., the luminous efficiency, thermal stability and chemical stability of these red phosphors under the excitation of purple or blue LEDs are still not up to the requirements of practical applications, so the development of new red light-emitting phosphors for LEDs has become a research hotspot at home and abroad.

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