The transparent colloidal solution of LaPO4:Ce,Tb nano-phosphor is synthesized from lanthanum acetate, cerium acetate, terbium acetate and trimethyl phosphate by the solvothermal reaction at 140°C in the mixture of water and methanol. The green photoluminescence (PL) due to the f-f transition of Tb3+ is observed by exciting the d-f transition of Ce 3+, followed by the energy transfer from Ce3+ to Tb 3+. The surface modification of LaPO4:Ce,Tb nano-phosphor powder by lauryl phosphate increases the PL intensity by a factor of 18. The surface modification is effective for LaPO4:Ce, but not for LaPO 4:Tb. These results suggest that the surface-passivation plays a significant role in the suppression of energy loss and the higher site-symmetry around Ce3+.
|Number of pages||4|
|Publication status||Published - 2005 Dec 1|
|Event||IDW/AD'05 - 12th International Display Workshops in Conjunction with Asia Display 2005 - Takamatsu, Japan|
Duration: 2005 Dec 6 → 2005 Dec 9
|Other||IDW/AD'05 - 12th International Display Workshops in Conjunction with Asia Display 2005|
|Period||05/12/6 → 05/12/9|
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