Title of article :
High enhancement of green upconversion luminescence of Li+/Er3+/Yb3+ tri-doped CaMoO4
Author/Authors :
Jun Ho Chung، نويسنده , , JEONG HO RYU?†، نويسنده , , Jong Won Eun، نويسنده , , Jeong-Hoon Lee، نويسنده , , Sang-Yeop Lee، نويسنده , , Tae Hyung Heo، نويسنده , , KWANG BO SHIM، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2012
Abstract :
The polycrystalline Li+/Er3+/Yb3+ tri-doped CaMoO4 were prepared by complex citrate-gel method. Under excitation of 980 nm, Li+/Er3+/Yb3+ tri-doped CaMoO4 upconversion (UC) phosphors exhibited weak red (656 and 670 nm), blue (410 nm) and strong green UC emission peaks (530 and 550 nm), respectively. The measured green emission intensity of Li+ doped CaMoO4 was 83 times higher than that of Li+ non-doped CaMoO4 due to local crystal field distortion or break around Er3+ ions. The optimum doping concentration of Li+ ions was investigated. Moreover, the effects of Li+ concentration for UC emission intensity were studied in detail.
Keywords :
Upconversion luminescence , Tri-doped Li+ ion , UC enhancement , Crystal field distortion
Journal title :
Materials Chemistry and Physics
Journal title :
Materials Chemistry and Physics
