Fig. 7: Electric-bias-dependent photoluminescence properties.

Photoluminescence spectra of (a, b) Cs2AgInCl6, (c, d) Cs2AgBiCl6, and (e,f) Cs2AgIn0.9Bi0.1Cl6. The inset shows the integrated intensity of photoluminescence curves at various measurement conditions. Plots (a, c, and e) show the spectra of compounds under various applied voltages at different times. The inset shows the integrated intensity of photoluminescence curves at various measurement conditions. Plots (b, d, and f) show the spectra at different intervals after switching off the voltage bias.