Investigation on photoluminescence quenching of CdSe/ZnS quantum dots by organic charge transporting materials

• Main Authors: Yuqiu Qu, Liuyang Zhang, Limin An, Hong Wei
• Format: Article
• Language: English
• Published: Sciendo 2015-12-01
• Series: Materials Science-Poland
• Subjects: quantum dots; charge transporting; photoluminescence quenching
• Online Access: https://doi.org/10.1515/msp-2015-0120
• ISSN: 2083-134X

The effect of different organic charge transporting materials on the photoluminescence of CdSe/ZnS core/shell quantum dots has been studied by means of steady-state and time-resolved photoluminescence spectroscopy. With an increase in concentration of the organic charge transporting material in the quantum dots solutions, the photoluminescence intensity of CdSe/ZnS quantum dots was quenched greatly and the fluorescence lifetime was shortened gradually. The quenching efficiency of CdSe/ZnS core/shell quantum dots decreased with increasing the oxidation potential of organic charge transporting materials. Based on the analysis, two pathways in the photoluminescence quenching process have been defined: static quenching and dynamic quenching. The dynamic quenching is correlated with hole transporting from quantum dots to the charge transporting materials.