title: Nondestructive Encapsulation of CdSe/CdS Quantum Dots in an Inorganic Matrix by Pulsed Laser Deposition.
abstract: We report the successful encapsulation of colloidal quantum dots in an inorganic matrix by pulsed laser deposition. Our technique is nondestructive and thus permits the incorporation of CdSe/CdS core/shell colloidal quantum dots in an amorphous yttrium oxide matrix (Y2O3) under full preservation of the advantageous optical properties of the nanocrystals. We find that controlling the kinetic energy of the matrix precursors by means of the oxygen pressure in the deposition chamber facilitates the survival of the encapsulated species, whose well-conserved optical properties such as emission intensity, luminescence spectrum, fluorescence lifetime, and efficiency as single-photon emitters we document in detail. Our method can be extended to different types of nanoemitters (e.g., nanorods, dots-in-rods, nanoplatelets) as well as to other matrices (oxides, semiconductors, metals), opening up new vistas for the realization of fully inorganic multilayered active devices based on colloidal nano-objects.
authors: Institut Lumière Matière, CNRS UMR5306, Université de Lyon, Université Lyon 1 , 69622 Villeurbanne Cedex, France.
authors: Antoine
authors: A
authors: Aubret
authors: Institut Lumière Matière, CNRS UMR5306, Université de Lyon, Université Lyon 1 , 69622 Villeurbanne Cedex, France.
authors: Julien
authors: J
authors: Houel
authors: Institut Lumière Matière, CNRS UMR5306, Université de Lyon, Université Lyon 1 , 69622 Villeurbanne Cedex, France.
authors: Antonio
authors: A
authors: Pereira
authors: Institut Lumière Matière, CNRS UMR5306, Université de Lyon, Université Lyon 1 , 69622 Villeurbanne Cedex, France.
authors: Justine
authors: J
authors: Baronnier
authors: LPEM, ESPCI-ParisTech, PSL Research University, CNRS, UPMC Paris VI, Sorbonnes Universités , 10 rue Vauquelin, 75005 Paris, France.
authors: Emmanuel
authors: E
authors: Lhuillier
authors: LPEM, ESPCI-ParisTech, PSL Research University, CNRS, UPMC Paris VI, Sorbonnes Universités , 10 rue Vauquelin, 75005 Paris, France.
authors: Benoit
authors: B
authors: Dubertret
authors: Institut Lumière Matière, CNRS UMR5306, Université de Lyon, Université Lyon 1 , 69622 Villeurbanne Cedex, France.
authors: Christophe
authors: C
authors: Dujardin
authors: Institut Lumière Matière, CNRS UMR5306, Université de Lyon, Université Lyon 1 , 69622 Villeurbanne Cedex, France.
authors: Florian
authors: F
authors: Kulzer
authors: Institut Lumière Matière, CNRS UMR5306, Université de Lyon, Université Lyon 1 , 69622 Villeurbanne Cedex, France.
authors: Anne
authors: A
authors: Pillonnet
keywords: CdSe/CdS quantum dots; encapsulation; inorganic matrix; pulsed laser deposition (PLD); single-photon emitters