Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 53: Poster II

HL 53.26: Poster

Mittwoch, 9. März 2016, 09:30–13:30, Poster A

Analysis of the energy transfer in Mn doped CdS/ZnS quantum dots funtionalized with organic dye molecules — •Mikko Wilhelm¹, Uwe Kaiser¹, Luise Rost¹, Carolina Carrillo-Carrion¹, Nadeem Sabir¹, Pablo Del Pino², Wolfgang Parak¹, and Wolfram Heimbrodt¹ — ¹Philipps-University Marburg, Germany — ²CIC Biomagune, San Sebastian, Spain

The luminescence and energy transfer characteristics of colloidal core shell CdS/ZnS quantum dots doped with manganese in the ZnS shell are investigated. Next to a luminescence band around 430nm from the CdS core a luminescence band typical for the manganese around 580nm can be observed after successful doping. Moreover, the quantum dots are functionalized with an organic dye. Time resolved measurements are used to investigate the Förster resonance energy transfer in the system and show a dye lifetime in the millisecond range, compared to a lifetime of a few nanoseconds for the pure dye. This is due to the quantum dot and manganese states acting as donors for the dye states. These properties are furthermore studied in dependence of the temperature. The quantum dots are therefore transferred from solution via drop casting on a quartz substrate. A change in the intensity and the lifetime of the different luminescence band is observed at low temperatures. Furthermore the manganese ions provide a magnetic moment to the system and the influence of a magnetic field on the luminescence is discussed.