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High‐Performance Shortwave‐Infrared Light‐Emitting Devices Using Core–Shell (PbS–CdS) Colloidal Quantum Dots
Author(s) -
Supran Geoffrey J.,
Song Katherine W.,
Hwang Gyu Weon,
Correa Raoul E.,
Scherer Jennifer,
Dauler Eric A.,
Shirasaki Yasuhiro,
Bawendi Moungi G.,
Bulović Vladimir
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201404636
Subject(s) - quantum dot , materials science , passivation , optoelectronics , photoluminescence , infrared , core (optical fiber) , shortwave , quenching (fluorescence) , wavelength , quantum efficiency , nanotechnology , optics , fluorescence , physics , radiative transfer , layer (electronics) , composite material
Core–shell PbS–CdS quantum dots enhance the peak external quantum efficiency of shortwave‐infrared light‐emitting devices by up to 50–100‐fold (compared with core‐only PbS devices). This is more than double the efficiency of previous quantum‐dot light‐emitting devices operating at wavelengths beyond 1 μm, and results from the passivation of the PbS cores by the CdS shells against in situ photoluminescence quenching.