Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Colloidal quantum dots of the II-VI and IV-VI groups emitting in whole visible and infrared spectrum are in high interest due to their expansion in many optical applications including LEDs and solid state lightning, displays and photovoltaics. Their unique properties arising from possibility of precise control of their size, composition and energy gap are great advantage allowing to obtain narrow, tuneable emission.
Bare core semiconductor nanocrystals such as CdS or CdSe emitting from blue to red can be easily and cheaply obtained, however their luminescent properties are strongly dependent on several factors such as surface ligand cover, solvent choice, storage atmosphere, defects and Auger process assisted non-radiative recombination pathways which are possible reasons of emission quantum yield quenching and makes their photoluminescence become unstable during excitation.
In our approach, a growth of the core (CdSe) and core/shell (CdSe/CdS) semiconductor NCs was observed in-situ in order to analyse a growth time dependent size, size distribution and quantum efficiency of photoluminescence. For CdSe cores three different surfactant ligands were investigated: oleic acid, oleylamine and octanethiol and the optimal conditions for the high photoluminescence quantum field (PL QY ~45%) and narrow emission line (~80 meV) were determined. Then, CdS shell was growth at core NCs and the optical properties were recorded in-situ. We realized that at the initial stage the PL QY significantly drops and recover during shell growth. The final PL QY of core/shell NCs was found to be similar to optimized core NCs.
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