Enhancement mechanism of quantum yield in core/shell/shell quantum dots of ZnS-AgIn₅S₈/ZnIn₂S₄/ZnS.

ABSTRACT: To achieve a high quantum yield (QY) of nanomaterials suitable for optical applications, we improved the optical properties of AgIn₅S₈ (AIS) quantum dots (QDs) by employing an alloyed-core/inner-shell/outer-shell (ZAIS/ZIS/ZnS) structure. We also investigated the mechanism of optical transitions to clarify the improvement of QYs. In AIS, the low-energy absorption near the band edge region is attributed to the weakly allowed band gap transition, which gains oscillator strength through state intermixing and electron-phonon coupling. The main photoluminescence is also ascribed to the weakly allowed band gap transition with characteristics of self-trapped excitonic emission. With alloying/shelling processes, the weakly allowed transition is enhanced by the evolution of th

SUBMITTER: Jeong S 

PROVIDER: S-EPMC10825935 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature