Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 12, Pages 2053-2060Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz4004735
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Funding
- National Science Foundation [CHE-1012898, DMR-0906966]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906966] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1012898] Funding Source: National Science Foundation
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The photoluminescence (PL) intensity of semiconductor quantum dots (QDs) is routinely monitored to track the chemical and physical properties within a sample or device incorporating the QDs. A dependence of the PL quantum yields (QYs) on the excitation energy could lead to erroneous conclusions but is commonly not considered. We summarize previous evidence and present results from two methodologies that confirm the possibility of a dependence of the PL QYs on the excitation energy. The data presented indicate that PL QYs of CdSe and CdSe/ZnS QDs suspended in toluene are highest for excitation just above the band gap, E-g, of each. The PL Qys decrease with increasing excitation energies up to 1 eV above E-g. The PL intensity decay profiles recorded for these samples at varying emission and excitation energies indicate that the changes in the PL QYs result from the nonradiative relaxation pathways sampled as the charge carriers relax down to the band edge.
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