Investigation on upconversion photoluminescence of Bi3TiNbO9:Er3+:Yb3+ thin films

► UC-PL intensities of BTNEY films increase with the deposition laser fluence. ► UC-PL intensities of BTNEY films increase with the substrate temperature. ► Grain size of thin films can be manipulated during the thin films deposition. ► UC-PL of thin films can be manipulated.