2Gd 2Si 4O 13:Ce 3+,Eu 2+,Sm 3+ phosphor for white-LEDs]]>

摘要

AbstractTo develop new white-light-emitting phosphor, a series of Ce3+-Eu2+-Sm3+doped Ba2Gd2Si4O13(BGS) phosphors were prepared by the solid-state reaction method, and their photoluminescence properties were studied. The Ce3+and Eu2+single-doped BGS show broad emission bands around in the region of 350–550 and 420–650nm, respectively. By co-doping Ce3+-Eu2+into BGS, the energy transfer (ET) from Ce3+to Eu2+is inefficient, which could be due to the competitive absorption between the two activator ions. The Sm3+-activated BGS exhibits an orangey-red emission in the region of 550–750nm. To achieve white emission, the BGS:0.06Ce3+,0.04Eu2+,ySm3+(0≤y≤0.18) phosphors were designed, in which the ET from Ce3+/Eu2+to Sm3+was observed. The emission color can be tuned by controlling the Sm3+concentration, and white emission was obtained in the BGS:0.06Ce3+,0.04Eu2+,0.06Sm3+sample. The investigation of thermal luminescence stability for the typical BGS:0.06Ce3+,0.04Eu2+