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CH3NH3PbBr3 PQDs exhibit a size‐tunable bandgap with narrow and bright emission: a) photograph of colloidal solutions in toluene under UV lamp excitation (λ = 365 nm); b) PL spectra tunability over the range of wavelengths indicated; c) optical absorption spectra with the respective PL spectra for the three samples synthesized at different precipitation temperatures as indicated.
