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Optical Amplification from Single Excitons in Colloidal Quantum Dots
Author(s) -
Doose Sören
Publication year - 2007
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200700478
Subject(s) - biexciton , quantum dot , population inversion , lasing threshold , exciton , electron , population , band gap , materials science , optoelectronics , physics , nanotechnology , condensed matter physics , quantum mechanics , laser , demography , sociology
The key to utilizing quantum dots (QDs) as lasing materials is to ensure a population inversion, a state that has proved difficult to achieve. A recent paper has addressed this problem by utilizing type II QDs (see scheme; left: type I, right: type II), whose bandgap structures are staggered such that electrons and holes are separated, to achieve population inversion that is solely based on single‐exciton states without any biexciton excitations.