Molten salt-synthesized Er3+/Yb3+/Sr2+-doped L-Ta2O5 with an intercalated intergrowth structure to boost the pure green upconversion luminescence

Er 3+ /Yb 3+ /Sr 2+ intercalates in L-Ta 2 O 5 , realizing a superlattice structure. The green UCL integrated intensity of L-Ta 2 O 5 :Er 3+ /Yb 3+ /Sr 2+ was 1.53 and 3.14 times greater than that of β-NaYF 4 :Er 3+ /Yb 3+ and NaY(WO 4 ) 2 :Er 3+ /Yb 3+ , respectively.