LAUSR

Abstract To develop new emission-tunable phosphors, a series of Ca 2-y Gd 8-m-x (SiO 4 ) 6 O 2 :mCe 3+ ,xTb 3+ ,yMn 2+ (CGS:mCe 3+ ,xTb 3+ ,yMn 2+ , 0 ≤ m ≤ 0.56, 0 ≤ x ≤ 4.0, 0 ≤ y ≤ 0.4) samples were prepared by solid-state reaction method, and their photoluminescence properties were investigated. When the Ce 3+ , Tb 3+ and Mn 2+ ions are single-doped into the CGS host separately, the purple, green and orange emissions have been obtained, respectively. The energy transfer (ET) of Gd 3+  → Tb 3+  → Mn 2+ was found in the CGS:Tb 3+ ,Mn 2+ phosphors, and the ET efficiency from Tb 3+ to Mn 2+ has been evaluated by using the Tb 3+ decay lifetime. When the Ce 3+ ions are introduced into the Tb 3+ -Mn 2+ doped phosphors, an efficient ET from Ce 3+ to Tb 3+ /Mn 2+ occurs, and the emissions of Tb 3+ -Mn 2+ are enhanced obviously. By studying the thermal quenching properties of the typical CGS:1.6Tb 3+ ,0.1Mn 2+ phosphor, it has been found that the Tb 3+ and Mn 2+ have different thermal stabilities, and the possible reason was discussed.