2, CAN GmbH, Hamburg, , Germany
Daniel Jostes, Tobias Jochum, Jan Niehaus, H. Weller
Physical Chemistry Department, University Hamburg.
Meanwhile the large scale synthesis of high quality Cadmium Selenide (CdSe) quantum dots (QD) with high quantum yield and small size distribution is established. This CdSe QD can be used in different technological applications for example biological imaging and display-devices. The use of cadmium in electronic devices is strongly restricted by the EU (RoHS), therefore it is necessary to replace Cadmium in variant fields. One of the most promising material to remove cadmium is Indium Phosphide (InP). InP is potentially less toxic, not restricted in electronic devices and has similar optical properties. Hereby we present a large scale synthesis of InP quantum dots with a continuous flow reactor. This synthesis is based on Wells dehalosilylation reaction, with indium(III)acetate and tris(trimethylsilyl)phosphine (TMSP). We succeeded producing InP QD with different sizes by variating the growth temperature and the flow rate. Moreover it is possible by adding selenium to improve the QY (>40%) including small full widths at half maxima (FWHM <50nm). Furthermore improvement of the QY (>70%) can be achieved by adding a shell on the alloyed core.