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(a) Photograph of highly luminescent FAPbBr3 NC films (bare and embedded in PMMA), under a UV lamp (λ = 365 nm). (b) PL spectra of ∼12 nm FAPbBr3 NCs in colloidal solution and in films. (c) Time-resolved (TR) PL traces for a solution and films of FAPbBr3 NCs. (d) PL QYs of FAPbBr3 NCs in various states: solution, bare films and polymer- (PMMA-) encapsulated films. All samples were prepared and tested in air.
