Super Broadband-Sensitive Upconversion in Tm and Ni Codoped Perovskites

Figure 2

UC emission spectra of the Tm-only doped and Tm and Ni codoped CaTi_0.9O₃ samples excited at (a) 1180 nm (both Tm³⁺ and Ni²⁺ absorption), (b) 1660 nm (Tm³⁺-only absorption), and (c) 960 nm (Ni²⁺-only absorption). (d) Excitation power-dependent UC emission intensities for the Tm and Ni codoped sample while excited at various wavelengths.

(a)

(b)

(c)

(d)