Red luminous silicon-oxygen nitride fluorescent material, preparation method and light emitting device using same

Abstract

The invention relates to red luminous silicon-oxygen nitride fluorescent material, preparation method and light emitting device using same. The general formula of the fluorescent material is MIuMIIv(Sil-alphaAalpha)wO deltaN(2 / 3(u+v)+4 / 3w-2 / 3delta): Eux, Ry, Dz, wherein MI is a Ca or Sr element; MII is selected from at least one element of Sr or Ca, Ba and Zn; A is selected from at least one element of Ge, Al, Ca and In; R is selected from at least one element of Nd, Dy, Ho, Tm, Ce, Er, Pr, Bi, Sm, Yb, Lu, Gd, Tb and Mn; D is selected from at least one ion of F-, Cl-, Br- and I-; and u, v, w, alpha, delta, x, y and z are molar coefficients. The fluorescent material capable of being excited by ultraviolet-blue-green light and emitting red light is prepared by adopting a normal pressure self-reduction synthesis method and applied to manufacture LED devices.

Description

technical field [0001] The invention relates to a silicon oxynitride red fluorescent material, in particular to a fluorescent material for white light and multi-color light-emitting devices including semiconductor light-emitting elements (LEDs). This material can be applied to lighting technology, display and field of optoelectronics. Background technique [0002] With the advent of light-emitting diodes, LEDs (semiconductor light-emitting diodes, Light-Emitting Diode), known as "the technology that illuminates the future", are gradually entering our daily lives. As a new lighting technology, LED is triggering a revolution in the field of lighting with its many advantages such as energy saving and environmental protection, flexible application, and long life. The appearance of white light LED is a substantial step for LED from display function to general lighting function. Among the white light LED technologies, warm white light LEDs are the closest to sunlight, are most i...

AI Technical Summary

Problems solved by technology

Alkaline earth metal elements, rare earth metal elements and their binary nitrides, and silicon diimides are extremely active substances that are extremely sensitive to air and humidity. Therefore, the above-mentioned preparation method has fine and harsh conditions, cumbersome steps, difficult control, and extremely high cost. High limitations, only suitable for a small amount of preparation in the laboratory, not conducive to the realization of industrial scale mass production

In addition, the sensitive, harsh and difficult-to-control characteristics of the raw materials and manufacturing process of the above-mentioned published patents make it difficult to adjust the emission wavelength and luminous intensity of fluorescent materials through effective means such as composition adjustment, co-activators and fluorescence enhancers. Therefore, the luminous intensity of the component-fixed fluorescent material prepared by the above-mentioned published patent is low, far lower than that of the yellow aluminate phosphor, and can only be finitely adjusted through the limited adjustment of its own elements and the introduction of trace elements in the crucible material. Emission wavelength and luminous intensity of phosphor

The performance limitations of the red-emitting fluorescent material disclosed in the above-mentioned patents make it poorly compatible with yellow aluminate and silicate phosphors, with large light effect attenuation and difficult adjustment of light color, which cannot well meet the technical requirements of warm white LEDs. Require

Patent CN1974713A also proposes a patent requirement for the red-emitting silicon nitride fluorescent material disclosed in the above-mentioned patent, but even if it is possible to simply synthesize the alkaline earth metal carbonate and silicon nitride under normal pressure and high temperature reduction conditions, it cannot It is difficult to completely remove the oxygen in alkaline earth metal oxides to synthesize a single-phase silicon nitride fluorescent material that does not contain oxygen at all

It has been reported in the literature that even under high pressure and high temperature (1600°C, 0.5MPa) conditions, the reaction of alkaline earth metal carbonate and silicon nitride can only synthesize a multiphase mixture in which the silicon nitride fluorescent phase accounts for 60%. Therefore, the patent discloses There are major flaws in the technical solution

Images