Fig. 3.

UV-Vis absorption spectrum of a Bi₂O₂CO₃ and b Bi–Bi₂O₂CO₃ (Inset shows the image of Bi₂O₂CO₃ and Bi–Bi₂O₂CO₃). Normalized steady-steady PL spectrum of c Bi₂O₂CO₃ and e Bi–Bi₂O₂CO₃. The excitation spectrum of Bi₂O₂CO₃ d and Bi–Bi₂O₂CO₃ f at different PL maxima