HIGHLIGHTS
SUMMARY
Spatially resolved PL or cathodoluminescence (CL) probe within the illuminated area revealed that the conversion was nonuniform, but the overall area of the "I-rich" regions increased with illumination time, and eventually appeared to reach a steady_state covering the entire illuminated area15,20,21. If the Br ions remained in the illuminated area, as implied, the complete quenching of the alloy state PL would suggest that the "I-rich" regions were uniformly embedded within the "Br-rich" matrix with an average separation distance shorter than the carrier diffusion length of the "Br-rich" matrix . . .
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