The Ceylon Journal of Science is a peer-reviewed journal published quarterly by the University Peradeniya, Sri Lanka in March, June, September and December. It aimed at publishing high quality research articles on topics related to different disciplines Science. accepts original articles, book reviews, reviews mini-reviews, short communications, opinions, notes, commentaries notes. has its own ...

In recent years, colloidal quantum dots (CQD) have been intensively studied in various fields due to their excellent optical properties, such as size-tunable absorption features and wide spectral tunability. Therefore, CQDs are promising infrared materials become alternatives for epitaxial semiconductors, HgCdTe, InSb, type II superlattices. Here, we report a simulation study of microspectromet...

A colloidal quantum dot laser emitting at 600 nm with a sub 10kW/cm(2) threshold at 5ns pulse pumping is reported. The device has a second order distributed feedback cavity for vertical emission and incorporates a bilayer planar waveguide structure based on a film of yellow-orange alloyed-core/shell CdS(x)Se(1-x)/ZnS quantum dots over-coated with polyvinyl alcohol. A study of the amplified spon...

We present colloidal silica microspheres encapsulating a homogeneous quantum dot layer at radial equidistance from the centre by utilizing electrostatic interaction between surface-engineered silica microspheres and QDs. The microspheres show dramatically enhanced optical absorption and emission with an appropriate silica shell thickness.