Upconversion photoluminescence and dielectric properties in Er3+ and Yb3+ co-doped Sr4La2Ti4Nb6O30

Single-band green UC emission locating around 515-570 nm region for SLTN: xEr3+-yYb3+ (x=0.05, y=0) and schematic diagram of the filled TTB structure for SLTN: xEr3+-yYb3+ in a-b plane.