Opal-ZnO nanocomposites: Structure and emission properties

Ga Emel'Chenko , An Gruzintsev , Mn Koval'Chuk , Vm Masalov , En Samarov , Ee Yakimov , Carlos Barthou (1) , Ii Zver'Kova

1 INSP - Institut des Nanosciences de Paris

The structure of opal-ZnO composites is studied by transmission electron microscopy and X-ray phase analysis. It is shown that, under thermal treatment of infiltrated samples, a solid-phase reaction proceeds at the opal-ZnO interface. As a result, zinc silicate beta-Zn2SiO4 and its high-temperature phase, willemite Zn2SiO4, are formed. The structure and emission properties of the nanocomposite are studied in relation to the degree of filling. For a sample subjected to 25 cycles of filling, luminescence controlled by the beta-Zn2SiO4 phase is detected in the blue spectral region (at 430 nm). The angular dependences of the luminescence and reflection spectra of an opal-ZnO composite sample subjected to four cycles of filling show the effect of suppression of a spontaneous emission of zinc oxide in the photonic band gap. (c) 2005 Pleiades Publishing, Inc.

Domaines: Matière Condensée [cond-mat]

Ga Emel'Chenko, An Gruzintsev, Mn Koval'Chuk, Vm Masalov, En Samarov, et al.. Opal-ZnO nanocomposites: Structure and emission properties. Fizika i tekhnika poluprovodnicov / Semiconductors, 2005, 39 (11), pp.1328-1332. ⟨10.1134/1.2128460⟩. ⟨hal-01281575⟩