Synthesis And Properties Of Rare Earth Ions Doped Yttrium Aluminium Both Borate Phosphors

Yttrium aluminium both borate (YAl₃(BO₃)₄, YAB) have good properties of mechanics, thermotics and optics, which have a wide applications in the matrix materials of luminescent powder and laser. In this paper, rare earth ions doped YAB phosphors were investigated. Results are obtained as follows:1 YAB powders were synthesized by solid state reaction, pyrogenic decomposition of nitrate, sol-gel combustion methods, respectively. Results of X-ray powder diffractometry (XRD) and scanning electron microscopy (SEM) show that:For these three methods, the lowest temperatures at which the single phase powders were synthesized were 1200℃, 1100℃and 1000℃, respectively.And in order to obtain the single phase of YAB, 40%,20% and 20% of excess H3BO3 were used in the three methods, respectively. SEM shows that the powder synthesized by sol-gel combustion method has the particles with the size of about 400nm and good dispersivity when the molar ratio of nitrate to citric acid is 1: 1.5.2 (Y,Gd)Al3(BO3)4:Eu³⁺ phosphors were synthesized by those three methods respectively. The XRD and SEM result show that the powder synthesized by sol-gel combustion has good dispersivity and need low temperature. The effects of doping with Gd³⁺ ion were studied.It is found that the emission intensity of Eu³⁺ increases firstly, and then decreases under the excitation of UV with the increasing Gd³⁺ concentration. An optimum Gd³⁺doping concentration of 75% is obtained.3 The powders of (Y,Gd)Al3(BO3)4:Tb³⁺ were synthesized by sol-gel combustion method at 1000℃. It is found that the quenching concentration of Tb is about 25%. Emission spectra show that the luminescence intensity of Tb³⁺ increases with the increasing Gd³⁺ doping concentration due to the fact that there exists the energy transfer of Gd³⁺→Tb³⁺ (6P7/2→5DJ) in (YGd)Al3(BO3)4:Tb³⁺.