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P.T.K. Chin
dr. P.T.K. Chin :: Research Description

Nano Materials
with challenging new properties and applications

Semiconductor crystals in the nano meter sized range, are often referred to as quantum dots. As consequence of their small size (often below <10 nm) they display spatial size restrictions to the wavefunctions of excited charge carriers (holes, and electrons). These size limitations are also know as quantum size effects. The size limitations results in the formation of discrete energy levels at the band edges, resulting in drastic but fascinating changes in the optical and electronic behavior of the small crystals.

The aim of this project is use of quantum dots (QDs) as luminescent chromophors in solid state lighting applications for instance in Light Emitting Diodes (LEDs). An other field of interest is study of the photo-physics of these QDs and other luminescent semiconductor nano crystals. Various type of QDs were synthesized, investigated and applied in this project.

The investigated semiconductor nano crystals in this project are: cadmium selenide (CdSe); cadmium sulfide (CdS); lead selenide (PbSe), and several core shell particles CdSe/ZnS, CdSe/CdS, CdTe/CdS, CdTe/CdSe.