6533b7dbfe1ef96bd126fe4e

RESEARCH PRODUCT

Energy of excitons and acceptor–exciton complexes to explain the origin of ultraviolet photoluminescence in ZnO quantum dots embedded in a SiO2 matrix

Juan P. Martínez-pastorPedro AmorósSihem JaziriJamal El HaskouriLobna Dallali

subject

PhotoluminescenceCondensed Matter::OtherChemistryExcitonGeneral ChemistryCondensed Matter::Mesoscopic Systems and Quantum Hall EffectCondensed Matter Physicsmedicine.disease_causeAcceptorCondensed Matter::Materials ScienceMatrix (mathematics)Quantum dotIonizationMaterials ChemistrymedicineAtomic physicsUltravioletBiexciton

description

Abstract Assuming finite depth and within the effective mass approximation, the energies of exciton states and of the acceptor–exciton complexes confined in spherical ZnO quantum dots (QDs) embedded in a SiO2 matrix are calculated using a matrix procedure, including a three-dimensional confinement of carrier in the QDs. This theoretical model has been designed to illustrate the two emission bands in the UV region observed in our experimental Photoluminescence spectrum (PL), with the first emission band observed at 3.04 eV and attributed to the bound ionized acceptor–exciton complexes, and the second one located at 3.5 and assigned to the free exciton. Our calculations have revealed a good agreement between the matrix element calculation method and the experimental results.

yearjournalcountryeditionlanguage
2011-06-01Solid State Communications
https://doi.org/10.1016/j.ssc.2011.03.024