Preparation and luminescence properties of Tb 3+ ‐doped garnet Y 2 Mg 2 Al 2 Si 2 O 12 luminescent materials

We prepared Y 2 Mg 2 Al 2 Si 2 O 12 :xTb 3+ (x = 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14 and 0.16) luminescent materials using a nodulizing procedure. The phase and luminescence properties of these materials were investigated. X‐ray diffraction results demonstrated that Tb 3+ ions doped into Y 2 Mg 2 Al 2 Si 2 O 12 hosts successfully and the Y 2 Mg 2 Al 2 Si 2 O 12 :xTb 3+ materials showed a pure cubic phase. Y 2 Mg 2 Al 2 Si 2 O 12 :xTb 3+ materials had the characteristic Tb 3+ emission bands derived from 5 D 4 → 7 F 6 , 7 F 5 , 7 F 4 , and 7 F 3 transitions when excited at 365 nm. The green emission band that derived from the 5 D 4 → 7 F 5 transition was highest due to the high possibility of both electric‐dipole and magnetic‐dipole transitions. Emission spectra indicated that the critical concentration of Tb 3+ in the Y 2 Mg 2 Al 2 Si 2 O 12 host was 0.14. The concentration quenching of Y 2 Mg 2 Al 2 Si 2 O 12 :Tb 3+ was derived from a dipole–dipole interaction.