Benvenuti nell'Anagrafe della Ricerca d'Ateneo
La valutazione delle attività di ricerca che si svolgono nelle università ha assunto un'importanza rilevante sia per l'intero sistema universitario sia all'interno di ogni singolo ateneo. Roma Tre si è quindi dotata di idonei strumenti informativi in grado di supportare al meglio le azioni di monitoraggio e di valutazione delle attività di ricerca svolte nei propri dipartimentied ha realizzato una Anagrafe della Ricerca di Ateneo.
EnglishThe creation of Pb2+ -based ternary nanophases was evidenced in co-evaporated CsX-PbX2 (X=Cl, Br, I) thin films using X-ray diffraction spectroscopy (XRD). The optical properties of CsPbX3 and Cs4PbX6 nanostructures were determined. CsPbX3 (X = Cl,Br) are wide gap semiconductors with direct band transitions and a pronounced Wannier free exciton emission showing subnanosecond decay times and very small Stokes-shift. On the contrary, it is supposed that, in CsPbI3, the auto-localization of the exciton state results in a broad and much slower emission with large Stokes shift. Cs4PbX6 is characterized by the auto-localized exciton emission in the near UV/violet spectral region and two component decay kinetics closely similar to that of Pb2+ emission centers in KX:Pb2+ (X = Cl, Br, I).
http://hdl.handle.net/11590/114659| Titolo: | Free and localised exciton of ternary nanocrystals in CsX-PbX2 thin films (X = Cl, Br, I) |
| Autori interni: | SOMMA, Fabrizia |
| Data di pubblicazione: | 2001 |
| Rivista: | RADIATION EFFECTS AND DEFECTS IN SOLIDS |
| Abstract: | The creation of Pb2+ -based ternary nanophases was evidenced in co-evaporated CsX-PbX2 (X=Cl, Br, I) thin films using X-ray diffraction spectroscopy (XRD). The optical properties of CsPbX3 and Cs4PbX6 nanostructures were determined. CsPbX3 (X = Cl,Br) are wide gap semiconductors with direct band transitions and a pronounced Wannier free exciton emission showing subnanosecond decay times and very small Stokes-shift. On the contrary, it is supposed that, in CsPbI3, the auto-localization of the exciton state results in a broad and much slower emission with large Stokes shift. Cs4PbX6 is characterized by the auto-localized exciton emission in the near UV/violet spectral region and two component decay kinetics closely similar to that of Pb2+ emission centers in KX:Pb2+ (X = Cl, Br, I). |
| Handle: | http://hdl.handle.net/11590/114659 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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