Electrogenerated chemiluminescence from PbS quantum dots.
We report the first observation of electrogenerated chemiluminescence (ECL) from PbS quantum dots (QDs). Different ECL intensities are observed for different ligands used to passivate the QDs, which indicates that ECL is sensitive to surface chemistry, with the potential to serve as a powerful probe of surface states and charge transfer dynamics in QDs. In particular, passivation of the QD surfaces with trioctylphosphine (TOP) increases ECL intensity by 3 orders of magnitude when compared to passivation with oleic acid alone. The observed overlap of the ECL and photoluminescence spectra suggests a significant reduction of deep surface trap states from the QDs passivated with TOP.
Sun
Liangfeng
L
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA. ls462@cornell.edu
Bao
Lei
L
Hyun
Byung-Ryool
BR
Bartnik
Adam C
AC
Zhong
Yu-Wu
YW
Reed
Jason C
JC
Pang
Dai-Wen
DW
Abruña
Héctor D
HD
Malliaras
George G
GG
Wise
Frank W
FW
D004583:Electrons; D007854:Lead / Q000737:chemistry*; D049449:Luminescence; D045663:Quantum Dots; D013053:Spectrophotometry; D013440:Sulfides / Q000737:chemistry*
D013440:Sulfides; C018391:lead sulfide; D007854:Lead