Fondazione Istituto Italiano Di Tecnologia

Fondazione Istituto Italiano Di Technologia

Roman Krahne

Liberato Manna

Roberto Cingolani

Sergio Marras

Karol Miszta

Guglielmo Lanzani

Salvatore Girardo

Dario Pisignano

Andrea Toma

Mirko Prato

Francesco Di Stasio

Yang Zhang

Fen Qiao

Rosaria Brescia

Margherita Zavelani-Rossi

Iwan Philemon Wilhelmus Remy Roger Moreels

Maria Grazia Lupo

Milena Arciniegas

Joel Quedar Ge Tian Chi Grim

Sotirios Christodoulou

Dirk Dorfs

Fanny Greullet

Giovanni Bertoni

We describe a method for patterning of colloidal nanocrystals films that combines a high energy beam treatment with a step of cation exchange. The high energy irradiation causes cross-linking of the ligand molecules present at the nanocrystal surface, and the cross-linked molecules act as a mask for the subsequent cation exchange reaction. Consequently, in the following step of cation exchange, the regions that have not been exposed to beam irradiation are chemically transformed, while the exposed ones remain unchanged. This selective protection allows the design of patterns that are formed by chemically different nanocrystals, yet in a homogeneous nanocrystal film.

Masked cation exchange lithography

Laser device characterized in that it comprises, as gain medium, a film of colloidal nanocrystals of semiconductor material, wherein said nanocrystals are two-dimensional nanocrystals suitable for forming quantum wells for confinement of the charge carriers in the nanocrystals and having a biexciton gain mechanism.

Continuous-wave pumped colloidal nanocrystal laser

This invention relates to the controlled realization of ordered superstructures of octapod-shaped colloidal nanocrystals, formed either in the liquid phase or on a solid substrate. These structures can be applied in many fields of technology.

Ordered superstructures of octapod-shaped nanocrystals, their process of fabrication and use thereof

A method of producing a lasing microsource of colloidal nanocrystals. The method includes the steps of preparing a nanocrystal solution in a solvent; depositing at least a drop of the nanocrystals solution with a drop volume below 1 nl on a flat substrate; and evaporating the solvent to dryness thereby to obtain at the edge of the evaporated drop a single annular stripe including a domain wherein the nanocrystals are arranged in an ordered array, wherein the ordered nanocrystals in the domain constitute an active region capable of lasing and the radially inner and outer edges of the stripe define a resonant cavity in which the active region is inserted.

Fabrication of lasing microcavities consisting of highly luminescent colloidal nanocrystals

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Genoa, Italy

Roman Krahne