The Influence of BaF₂ Flux Concentration on the Luminescence of Sr₃SiO₅:Eu²⁺

Abstract

Silicate strontium phosphor for white light LEDs was synthesized by high temperature solid-state method. The structure, surface, excitation and emission spectra of Sr3SiO5: Eu2+ phosphor which contain different mass fractions of BaF2 were measured. The results show that BaF2 quantity affects the structure, surface and spectra of Sr3SiO5: Eu2+ sample. The sample has the best properties when the BaF2 concentration comes to 2.0wt%. The structure of sample is tetragonal phase Sr3SiO5. The emission and excitation spectra peaks locate respectively at 575nm and 537nm. The samples can be excited by InGaN blue chip. The emission peaks appeared apparent red shift with the increase of BaF2 concentration. A white light emission spectrum with good color rendition was obtained by coupling the phosphor with blue chip.

Structure, properties and luminescence mechanism of Sr1.93B2O5:0.07Eu3+ red phosphors

“…However, the emission wavelength of YAG:Ce 3+ phosphor lack of red component is too short to provide pure white LED. In order to improve white LEDs color rendering and decrease color temperature, some new types of phosphor like silicate [4][5][6][7][8][9][10][11][12][13] , nitride [14,15] and borate [16][17][18] etc [19,20] were carried out and the method adding red phosphor into YAG:Ce 3+ phosphor was proposed. Presently [21] , all kinds of red phosphor were put forward to using in white LED as nitride [22] , molybdate [23][24][25] , vanadate [26,27] , sulfide [28,29] , phosphate [30] , borate [31,32] and so on.…”