Spectral Tuning, Stabilities under External Exposures, and Spontaneous Enhancement of Emission Intensity in Grown‐into‐Glass All‐Inorganic Metal Halide Perovskite Nanocrystals

Herein, the grown-into-glass (GIG) CsPbBr3:Ln3+ (Ln = La, Lu) nanocrystals (NCs) are designed and fabricated using an in situ nanocrystallization method. It is shown that a substitution of Pb2+ sites with Ln3+ ions leads to blueshift emission position induced by increase bandgap CsPbBr3. Additionally, GIG-samples found feature excellent photoluminescent (PL) properties after being immersed respectively water for 300 days at room temperature, boiling 12 h, corrosive environments 24 as well recoverable PL intensity either several cycles heat-cooling experiments or continuously exposed 405 nm laser irradiation. Besides, spontaneous enhancement 20-25% during 1-2.5 hours' stage irradiation, attributed radiative recombination charge carriers can be de-trapped from trapping levels upon light irradiation then spontaneously reinforces intensity, observed GIG-CsPbBr3:Ln3+ NCs. Finally, white light-emitting prototype, CIE chromaticity coordinate (0.4110, 0.3706), color rendering index 89 correlated temperature 3363 K realized combining GIG-CsPbBr3 NCs, YAG:Ce CaWO4:Eu phosphors.