High enhancement of green upconversion luminescence of Li+/Er3+/Yb3+ tri-doped CaMoO4

► Synthesis of Li+/Er3+/Yb3+ tri-doped CaMoO4 upconversion phosphor at first time. ► CaMoO4: Li+/Er3+/Yb3+ exhibited weak red, blue emissions and strong green emission. ► High enhancement of green upconversion emission about 83 times by tri-doped Li+ ions.