Synthesis And Luminescent Properties Of Barium Borate Phosphor

This paper is focused on the luminescent materials of borates. Some kinds of Ba2B2O5 phosphor doped with rare-earth ions Eu3+,Ce3+,Tb3+,Sm3+ and Dy3+ were fabricated by traditional high temperate solid stated method. We studied their luminescent properties and have a preliminary theoretical analysis:1. The red phosphor Ba2B2O5:Eu3+ was synthesized by high temperature solid state reaction. It shows four group major emission peaks locating at 580 nm and 592 nm,612 nm,618 nm and 623 nm,656 nm and 690 nm,700 nm and 707 nm, respectively. The strongest is corresponding to the 5D0â†'7F2 (618 nm) transition of Eu3+. The chromatic properties of phosphor Ba2B2O5:Eu3+ was investigated and the role of charge compensation to the emission intensity was studied also.2. The phosphor Ba2B2O5:Ce3+ was synthesized by high temperature solid state reaction. It exhibits three group major excitation peaks locating at 255 nm,295 nm and 350 nm, and the strongest peak is at 350 nm. At different excitation wavelengths, the emission spectra are also different and the red shift phenomenon occurs. It also proves that the energy transfer from Ce3+ to Eu3+ exists in the phosphor Ba2B2O5:Ce3+, Eu3+3. The Ba2B2O5:Tb3+ green phosphor was synthesized, and its luminescent properties were investigated. The excitation spectra was located at 200 nm-300 nm and 330 nm-400 nm and the emission peaks were at 489 nm,545 nm,585 nm and 622 nm, corresponding to 5D4â†'7FJ (J= 6,5,4,3) transitions of Tb3+. The influence of charge compensation Na+ to the emission intensity was studied also.4. The red phosphor Ba2B2O5:Sm3+ was prepared by high temperature solid state reaction. The strongest excitation peak is at 400 nm, which matches UV-LED (Ultraviolet-Light Emitting Diode) excitation. The emission spectra consists of three linear peaks locating at 563 nm,600 nm and 648 nm. The influence of the concentration of Sm3+ ions to the emission intensity was investigated and the concentration quench was happened when the concentration of Sm3+ ions was 0.06. According to the Dexter theory, the concentration self-quenching mechanisms are the d-q interaction. 5. The phosphor Ba2B2O5:Dy3+ was prepared, which emission and excitation spectra are both wide spectra of multi-peaks. The emission peaks are at 483 nm and 575 nm, and the excitation peaks are located at 296 nm,322 nm,348 nm,363 nm,386 nm, 424 nm and 450 nm. The influence of the concentration of Dy3+ions to the emission intensity and the ratio (IY/IB) of yellow emission (575 nm) to blue emission (483 nm) were studied. The role of charge compensation Li+ to the emission intensity was investigated also.