Absolute Photoluminescence Quantum Yields of IR-26 Dye, PbS and PbSe Quantum Dots

Octavi E. Semonin; Justin C. Johnson; Joseph M. Luther; Aaron G. Midgett; Arthur J. Nozik; Matthew C. Beard

doi:10.1021/jz100830r

Absolute Photoluminescence Quantum Yields of IR-26 Dye, PbS and PbSe Quantum Dots

Octavi E. Semonin, Justin C. Johnson, Joseph M. Luther, Aaron G. Midgett, Arthur J. Nozik, Matthew C. Beard

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Abstract

In this study, we have directly measured the photoluminescence quantum yield (Φ_PL) of IR-26 at a range of concentrations and the Φ_PL of PbS and PbSe QDs for a range of sizes. We find that the Φ_PL of IR-26 has a weak concentration dependence due to reabsorption, with a Φ_PL of 0.048 ± 0.002% for low concentrations, lower than previous reports by a full order of magnitude. We also find that there is a dramatic size dependence for both PbS and PbSe QDs, with the smallest dots exhibiting a Φ_PL in excess of 60%, while larger dots fall below 3%. A model, including nonradiative transition between electronic states and energy transfer to ligand vibrations, appears to explain this size dependence. These findings provide both a better characterization of photoluminescence for near-infrared emitters and some insight into how improved QDs can be developed.

Original language	American English
Pages (from-to)	2445-2450
Number of pages	6
Journal	Journal of Physical Chemistry Letters
Volume	1
Issue number	16
DOIs	https://doi.org/10.1021/jz100830r https://doi.org/10.1021/jz100830r
State	Published - 19 Aug 2010

NREL Publication Number

NREL/JA-590-48778

Keywords

nanoparticles
photoluminescence
quantum dots

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title = "Absolute Photoluminescence Quantum Yields of IR-26 Dye, PbS and PbSe Quantum Dots",

abstract = "In this study, we have directly measured the photoluminescence quantum yield (ΦPL) of IR-26 at a range of concentrations and the ΦPL of PbS and PbSe QDs for a range of sizes. We find that the ΦPL of IR-26 has a weak concentration dependence due to reabsorption, with a ΦPL of 0.048 ± 0.002% for low concentrations, lower than previous reports by a full order of magnitude. We also find that there is a dramatic size dependence for both PbS and PbSe QDs, with the smallest dots exhibiting a ΦPL in excess of 60%, while larger dots fall below 3%. A model, including nonradiative transition between electronic states and energy transfer to ligand vibrations, appears to explain this size dependence. These findings provide both a better characterization of photoluminescence for near-infrared emitters and some insight into how improved QDs can be developed.",

keywords = "nanoparticles, photoluminescence, quantum dots",

author = "Semonin, {Octavi E.} and Johnson, {Justin C.} and Luther, {Joseph M.} and Midgett, {Aaron G.} and Nozik, {Arthur J.} and Beard, {Matthew C.}",

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AU - Semonin, Octavi E.

AU - Johnson, Justin C.

AU - Luther, Joseph M.

AU - Midgett, Aaron G.

AU - Nozik, Arthur J.

AU - Beard, Matthew C.

PY - 2010/8/19

Y1 - 2010/8/19

N2 - In this study, we have directly measured the photoluminescence quantum yield (ΦPL) of IR-26 at a range of concentrations and the ΦPL of PbS and PbSe QDs for a range of sizes. We find that the ΦPL of IR-26 has a weak concentration dependence due to reabsorption, with a ΦPL of 0.048 ± 0.002% for low concentrations, lower than previous reports by a full order of magnitude. We also find that there is a dramatic size dependence for both PbS and PbSe QDs, with the smallest dots exhibiting a ΦPL in excess of 60%, while larger dots fall below 3%. A model, including nonradiative transition between electronic states and energy transfer to ligand vibrations, appears to explain this size dependence. These findings provide both a better characterization of photoluminescence for near-infrared emitters and some insight into how improved QDs can be developed.

AB - In this study, we have directly measured the photoluminescence quantum yield (ΦPL) of IR-26 at a range of concentrations and the ΦPL of PbS and PbSe QDs for a range of sizes. We find that the ΦPL of IR-26 has a weak concentration dependence due to reabsorption, with a ΦPL of 0.048 ± 0.002% for low concentrations, lower than previous reports by a full order of magnitude. We also find that there is a dramatic size dependence for both PbS and PbSe QDs, with the smallest dots exhibiting a ΦPL in excess of 60%, while larger dots fall below 3%. A model, including nonradiative transition between electronic states and energy transfer to ligand vibrations, appears to explain this size dependence. These findings provide both a better characterization of photoluminescence for near-infrared emitters and some insight into how improved QDs can be developed.

KW - nanoparticles

KW - photoluminescence

KW - quantum dots

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Absolute Photoluminescence Quantum Yields of IR-26 Dye, PbS and PbSe Quantum Dots

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Keywords

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