白光LED氮化物氮氧化物荧光粉的制备与其发光性能的研究

he white light-emitting diodes(LEDs) have drawn much attention as a new illumination and displays because of their high light efficiency, long service lifetime and low energy consumption. The conventional method to produce a white light is making up a blue LED chip with a yellow-emitting phosphor,YAG:Ce3+, however it has a low color render index, because it lacks a red component. Currently, many report have been carried out to develop red-emitting phosphors, some nitride and oxynitride phosphors have good performance for white LED applications. These phosphors with high color rendering index and chemical stability can fix the disadvantage of YAG: Ce3+, (Sr1-xBax)2Si2O2N2: Eu2+ phosphors were prepared by solid-state reaction with two-step processes using different fluxs. The emissions bands ranged from 538nm to 556nm for change the value of x, the phosphor with NH4F flux and When x=0.5 shows the highest emission intensity. When x=0.5 it has highest luminescence output, which is 113% times as high as that of (Y,Gd)3(Al,Ga)5O12:Ce3+. The excitation spectra peaking at about 360nm so that the resultant phosphor can be excited by blue InGaN chips. The results show that this phosphor has a potential application in WLEDs.