Super Broadband-Sensitive Upconversion in Tm and Ni Codoped Perovskites

Figure 4

UC emission spectra of the CaTi_0.9O₃:Tm, Ni samples with variable Tm³⁺ ion concentrations excited at (a) 1180 nm (both Tm³⁺ and Ni²⁺ absorption) and (b) 1060 nm (Ni²⁺-only absorption). (c) Absorption spectra of the corresponding samples. Note that the Ni²⁺ concentrations are different in the Ni-only doped and Tm and Ni codoped samples in (c).

(a)

(b)

(c)