TY - JOUR
T1 - Atomistic model of fluorescence intermittency of colloidal quantum dots
AU - Voznyy, O.
AU - Sargent, E. H.
PY - 2014/4/16
Y1 - 2014/4/16
N2 - Optoelectronic applications of colloidal quantum dots demand a high emission efficiency, stability in time, and narrow spectral bandwidth. Electronic trap states interfere with the above properties but understanding of their origin remains lacking, inhibiting the development of robust passivation techniques. Here we show that surface vacancies improve the fluorescence yield compared to vacancy-free surfaces, while dynamic vacancy aggregation can temporarily turn fluorescence off. We find that infilling with foreign cations can stabilize the vacancies, inhibiting intermittency and improving quantum yield, providing an explanation of recent experimental observations.
AB - Optoelectronic applications of colloidal quantum dots demand a high emission efficiency, stability in time, and narrow spectral bandwidth. Electronic trap states interfere with the above properties but understanding of their origin remains lacking, inhibiting the development of robust passivation techniques. Here we show that surface vacancies improve the fluorescence yield compared to vacancy-free surfaces, while dynamic vacancy aggregation can temporarily turn fluorescence off. We find that infilling with foreign cations can stabilize the vacancies, inhibiting intermittency and improving quantum yield, providing an explanation of recent experimental observations.
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U2 - 10.1103/PhysRevLett.112.157401
DO - 10.1103/PhysRevLett.112.157401
M3 - Article
C2 - 24785069
AN - SCOPUS:84898936869
SN - 0031-9007
VL - 112
JO - Physical review letters
JF - Physical review letters
IS - 15
M1 - 157401
ER -