Title of the paper:Differential tunability effect on the optical properties of doped and undoped quantum dots

Authors:Madhulekha Gogoi, Pritam Deb and Aleksander Kostka

University/Institute: Tezpur University, MPIE

Abstracts:We have studied the optical properties of size-tunable undoped and Mn

2þ-doped cadmium telluride (CdTe) quantum dots (QDs) of monodisperse suspensions with emission wavelength varying between 500 and 680nm. The role of the surface is investigated for obtaining size-tunable, bright, and stable CdTe QDs. Differentially tunable optical properties of doped and undoped CdTe QDs has been reported. Unlike the continuous redshiftingintheabsorptionspec traofpristineCdTesystem,an unusual blueshift is observed for doped CdTe system after a certain time period of refluxion, followed by again a redshift andthedisappearanceofearlierpeakwithfurtherrefluxing.The available size range and optical properties are significantly controlled through Mn 2þ doping. The surface adsorbed Mn promotes ripeningof the doped system aswell as disintegration into smaller fraction after saturation in growth occurs. An optimumsizefractionisidentifiedforboththesystemsbasedon theirphotoluminescence(PL) quantumyield.Thephotophysics of Mn 2þ -doped nanocrystals has been proposed.

Links to the paper (link to the journal webpage):http://onlinelibrary.wiley.com/doi/10.1002/pssa.201228074/abstract