Figure 3.

Light-induced phase separation of COC-encapsulated CsPbI₂Br PNCs and thin films continuously excited by CW light at 405 nm with a laser power intensity of 3180 W cm^–2 during 0, 10, 20, 30, 40, and 50 min illuminations. (a) Evolution of PL for COC-encapsulated CsPbI₂Br PNCs. (b) Evolution of PL for COC-encapsulated CsPbI₂Br thin films. (c) Steady state PL spectra of the PNCs (green line) and the COC-encapsulated CsPbI₂Br PNCs (orange line). (d) Steady state PL spectra of the thin films (green line) and the COC-encapsulated CsPbI₂Br thin films (orange line). (e and f) Activation energies of ion migration extracted from Arrhenius plots of the PL of CsPbI₂Br PNCs and COC-encapsulated CsPbI₂Br PNCs, respectively. The orange line represents a linear fit to the data (green square).