Photoluminescence of Te-Doped Double Perovskite Cs₂ZrCl₆ Nanocrystals Versus Bulk: Insights From Temperature-Dependent Spectroscopy.

ABSTRACT: Although bulk crystals of lead-free vacancy-ordered double perovskites demonstrated a highly efficient emission, their nanocrystals (NCs) counterparts exhibit inferior optical performance. To understand the reasons behind this phenomenon, Cs₂ZrCl₆:Te⁴⁺ double perovskite NCs are synthesized, and their optical properties are compared with their bulk powders. Temperature-dependent spectroscopy revealed that the NCs sustain a thermal sensitization of the intermediate trap state, which is located between the self-trapped state of the host (Cs₂ZrCl₆) and the triplet states of the dopant (Te⁴⁺). This opens up a pathway for the non-radiative recombination, and thus decreases the energy transfer efficiency from host to dopant. Import

SUBMITTER: Liu Y 

PROVIDER: S-EPMC12306418 | biostudies-literature | 2025 Jul

REPOSITORIES: biostudies-literature