caa a22 4500 463211162 CHVBK 20180405153141.0 cr unu---uuuuu 170326e20070701xx s 000 0 eng 10.1007/s00339-007-3955-3 doi (NATIONALLICENCE)springer-10.1007/s00339-007-3955-3 New phenomenon in the channels of mesoporous silicate CMI-1: quantum size effect and two-photon absorption of ZnO nanoparticles [Elektronische Daten] [C. Bouvy, E. Chelnokov, W. Marine, R. Sporken, B.-L. Su] Quantum size effect (QSE) and very efficient laser action were observed in ZnO-mesoporous CMI-1 silica nanocomposites prepared through the incorporation of ZnO nanoparticles inside the channels of a silica mesoporous material CMI-1. The incorporation was made by direct impregnation of the mesoporous material in a zinc nitrate aqueous solution followed by calcination. The PL spectrum of the nanocomposites presents a significant blue-shift corresponding to the enhancement of the semiconductor band gap. Being excited by incident photons with energy of 1.82eV, the ZnO nanoparticles exhibit spontaneous emission due to the excitonic recombination. In our samples, spontaneous emission turns to stimulated emission when the pumping intensity reaches a threshold value. This effect implies a two-photon excitation which was never observed with ZnO nanoparticles. This paper deals with results about the characteristics of the matrix and the nanocomposites and the lasing effect. A two-photon excitation phenomenon has been observed. Springer-Verlag, 2007 Bouvy C. Laboratoire de Chimie des Matériaux Inorganiques (CMI), FUNDP - University of Namur, 61, Rue de Bruxelles, 5000, Namur, Belgium aut Chelnokov E. Centre de Recherche sur la Matière Condensée et Nanosciences (CRMCN), UPR 7251 CNRS, Faculté des Sciences de Luminy, Université de la Méditerranée, 13288, Marseille Cedex 9, France aut Marine W. Centre de Recherche sur la Matière Condensée et Nanosciences (CRMCN), UPR 7251 CNRS, Faculté des Sciences de Luminy, Université de la Méditerranée, 13288, Marseille Cedex 9, France aut Sporken R. Laboratoire de Physique des Matériaux Electroniques, The University of Namur (FUNDP), 61, Rue de Bruxelles, 5000, Namur, Belgium aut Su B.-L Laboratoire de Chimie des Matériaux Inorganiques (CMI), FUNDP - University of Namur, 61, Rue de Bruxelles, 5000, Namur, Belgium aut Applied Physics A Springer-Verlag 88/1(2007-07-01), 105-109 0947-8396 88:1<105 2007 88 339 https://doi.org/10.1007/s00339-007-3955-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00339-007-3955-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bouvy C. Laboratoire de Chimie des Matériaux Inorganiques (CMI), FUNDP - University of Namur, 61, Rue de Bruxelles, 5000, Namur, Belgium aut NATIONALLICENCE 700 1- Chelnokov E. Centre de Recherche sur la Matière Condensée et Nanosciences (CRMCN), UPR 7251 CNRS, Faculté des Sciences de Luminy, Université de la Méditerranée, 13288, Marseille Cedex 9, France aut NATIONALLICENCE 700 1- Marine W. Centre de Recherche sur la Matière Condensée et Nanosciences (CRMCN), UPR 7251 CNRS, Faculté des Sciences de Luminy, Université de la Méditerranée, 13288, Marseille Cedex 9, France aut NATIONALLICENCE 700 1- Sporken R. Laboratoire de Physique des Matériaux Electroniques, The University of Namur (FUNDP), 61, Rue de Bruxelles, 5000, Namur, Belgium aut NATIONALLICENCE 700 1- Su B.-L Laboratoire de Chimie des Matériaux Inorganiques (CMI), FUNDP - University of Namur, 61, Rue de Bruxelles, 5000, Namur, Belgium aut NATIONALLICENCE 773 0- Applied Physics A Springer-Verlag 88/1(2007-07-01), 105-109 0947-8396 88:1<105 2007 88 339 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer