Electrogenerated Chemiluminescence from PbS Quantum Dots
Nano Letters2008Vol. 9(2), pp. 789–793
Citations Over TimeTop 10% of 2008 papers
L. Sun, Lei Bao, Byung‐Ryool Hyun, Adam Bartnik, Yu‐Wu Zhong, Jason Reed, Dai‐Wen Pang, Héctor D. Abruña, George G. Malliaras, Frank W. Wise
Abstract
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.
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