Luminescence properties of In(Zn)P alloy core/ZnS shell quantum dots

• DOI: 10.1063/1.3515417
• Publication Date: 2010-11-10T23:19:40Z
• Authors: Ung Thi Dieu Thuy; Peter Reiss; Nguyen Quang Liem
• Keywords: Quantum yield; Stokes shift; Zinc stearate

Chemically synthesized InP/ZnS core/shell quantum dots (QDs) are studied using time-resolved photoluminescence spectroscopy and x-ray diffraction. Zinc stearate, which is added during the synthesis of InP core, significantly improves optical characteristics QDs. The luminescence yield (QY) reaches 60%–70% emission tunable from 485 to 586 nm by varying Zn2+:In3+ molar ratio growth temperature. observed increased Stokes shift, decay time, QY in presence Zn rationalized formation an In(Zn)P alloy structure that causes band-edge fluctuation enhance confinement excited carriers.