Fig. 5

Emission spectra of an aqueous solutions of Tb⁺³—8HQ (2 × 10^–5 M Tb⁺³ and 6 × 10^–5 M 8HQ), Tb⁺³—PRU (2 × 10^–5 M Tb⁺³, 300 ng / mL PRU) and Tb⁺³—8HQ—PRU (2 × 10^–5 M Tb⁺³, 6 × 10^–5 M 8HQ and 300 ng / mL Pru using pH 3.2 of phosphate buffer) (λ_ex 226 nm)