Super‐Absorber, Super‐Bright, Nearly‐Non‐Blinking CsPbI3 Perovskite Nanocrystal

Abstract Gigantic magnitude of molar extinction coefficient ( ɛ ) (≈2 × 10 8 m −1 cm −1 ) and PLQY (0.98) through Zn‐alloying and surface‐passivating ligand variation, make the CsPbI 3 based perovskite nanocrystal (PNC) the most super‐absorbing and most super‐bright among quantum dot‐PNC family. Radiative rate got enhanced 9 times and non‐radiative rate decreased 13 times. Moreover, very high (detrapping rate/trapping rate) of electron and 90% peak of ON fraction make this PNC a nearly‐non‐blinking one. Ultrafast and comparatively shorter hot exciton/electron cooling time (536 fs) and hot exciton/electron trapping time (516 fs) can explain why this PNC exhibits hitherto unobserved excellent optical properties.