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Inorganic Solids of CdSe Nanocrystals Exhibiting High Emission Quantum Yield
Author(s) -
Khon Elena,
Lambright Scott,
Khon Dmitry,
Smith Bryan,
O'Connor Timothy,
Moroz Pavel,
Imboden Martene,
Diederich Geoffrey,
PerezBolivar Cesar,
Anzenbacher Pavel,
Zamkov Mikhail
Publication year - 2012
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201200939
Subject(s) - nanocrystal , materials science , quantum dot , quantum yield , light emitting diode , optoelectronics , nanoparticle , nanotechnology , band gap , semiconductor , solid state lighting , diode , photoluminescence , fluorescence , optics , physics
Abstract A general strategy for the assembly of all‐inorganic light‐emitting nanocrystal films with emission quantum yield in the 30–52% range is reported. The present methodology relies on solution‐processing of CdSe nanocrystals into a crystalline matrix of a wide band gap semiconductor (CdS, ZnS), which replaces the original molecular ligands on nanocrystal surfaces with an inorganic medium. Such matrices efficiently protect nanoparticles from the surrounding environment and preserve the quantum confinement of electrical charges in embedded CdSe NCs. In addition to strong emission, fabricated films show excellent thermal and chemical stability, and a large refractive index, which avails their integration into emerging solid‐state nanocrystal devices, including light‐emitting diodes, solar concentrators, and quantum dot lasers.