Enhanced aqueous stability and radiative-charge-transfer of CsPbBr3/Ag2S perovskite nanocrystal hybrids

A convenient strategy to enhance the aqueous stability and radiative-charge-transfer of perovskite nanocrystals (PNCs) is developed via hybriding CsPbBr 3 PNCs with Ag 2 S nanoparticles , which is conducted by directly decomposing silver diethyldithiocarbamate in CsPbBr 3 PNCs crude. The obtained CsPbBr 3 -Ag 2 S hybrids are aqueous stable, and exhibit obviously enhanced aqueous photoluminescence (PL) with a quantum yield up to 82% in pure water as well as boosted electrochemical response for charge injection and 9-fold enhanced electrochemiluminescence (ECL) than CsPbBr 3 PNCs in aqueous electrolyte . Both PL and ECL spectra of CsPbBr 3 -Ag 2 S hybrids are almost identical to the PL spectrum of CsPbBr 3 PNCs, indicating radiative-charge-transfer within CsPbBr 3 -Ag 2 S hybrids only occurs in CsPbBr 3 segment. Annihilation ECL demonstrates that all the charges injected onto CsPbBr 3 -Ag 2 S hybrids at the redox potentials of Ag 2 S segment can be efficiently transferred into CsPbBr 3 segment to enhance radiative-charge-transfer. This strategy is promising for the application of PNCs as well as the developing of novel electrochemiluminophores.