Abstract
The high-pressure polymorph of β-YB3O6 was stabilized by doping Bi3+ under ambient pressure, thus solid solutions of β-Y1-mBimB3O6 (0.10 ≤ m ≤ 0.30), β-Y0.80-xBi0.20TbxB3O6 (0.05 ≤ x ≤ 0.80), and β-Y0.80-yBi0.20EuyB3O6 (0.05 ≤ y ≤ 0.80) were prepared simply by high temperature solid state reactions. The phase purity and the successful cationic substitutions were confirmed by powder X-ray diffraction, where the linear expansion of lattice parameters was observed due to the replacement of Y3+ by lager cations. The second function of Bi3+ was to behave as a photoluminescent activator giving the blue emission, as well as a sensitizer to Tb3+ and Eu3+, which emit green and red light, respectively. Bright and color-tunable emissions from blue to green (or blue to red) were achieved by manipulating the relative ratio between Bi3+ and Tb3+ (or Eu3+). In final, a white emission was observed for the triply-doped phosphor β-Y0.49Bi0.20Tb0.30Eu0.01B3O6.
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