- Controlling the exciton energy of zinc oxide (ZnO) quantum dots by changing the confinement conditions.
Controlling the exciton energy of zinc oxide (ZnO) quantum dots by changing the confinement conditions.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2015-02-25)
Sergej Repp, Emre Erdem
PMID25708483
ABSTRACT
ZnO nanoparticles were synthesized by solid state and hydrolysis methods based on the conventional precipitation. In situ growth of ZnO nanoparticles were monitored by photoluminescence spectroscopy (PL). By the help of electron paramagnetic resonance (EPR) technique, detailed analysis of intrinsic defect structure of ZnO was given with respect to mean particle size. In nanoscale concentration of surface defects enormously increased and core defects reduced. In addition, blue-shift was observed in PL spectra at near-band-edge UV region due to e-h recombination. Calculation of band gap energies by the aid of Brus equation revealed consistent results with the experimental observations.
MATERIALS
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Brand
Product Description
Sigma-Aldrich
Sodium hydroxide, puriss., meets analytical specification of Ph. Eur., BP, NF, E524, 98-100.5%, pellets
Sigma-Aldrich
Sodium hydroxide, puriss. p.a., ACS reagent, reag. Ph. Eur., K ≤0.02%, ≥98%, pellets
Sigma-Aldrich
Sodium hydroxide, anhydrous, free-flowing, Redi-Dri™, reagent grade, ≥98%, pellets
Sigma-Aldrich
Ethanol, purum, absolute ethanol, denaturated with 4.8% isopropanol, A15 IPA1, ≥99.8% (based on denaturant-free substance)