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Title: Characterizing Photon Reabsorption in Quantum Dot-Polymer Composites for Use as Displacement Sensors

Abstract

The reabsorption of photoluminescence within a medium, an effect known as the inner filter effect (IFE), has been well studied in solutions, but has garnered less attention in regards to solid-state nanocomposites. Photoluminescence from a quantum dot (QD) can selectively excite larger QDs around it resulting in a net red-shift in the reemitted photon. In CdSe/CdS core/shell QD-polymer nanocomposites, we observe a large spectral red-shift of over a third of the line width of the photoluminescence of the nanocomposites over a distance of 100 μm resulting from the IFE. Unlike fluorescent dyes, which do not show a large IFE red-shift, QDs have a component of inhomogeneous broadening that originates from their size distribution and quantum confinement. By controlling the photoluminescence broadening as well as the sample dispersion and concentration, we show that the magnitude of the IFE within the nanocomposite can be tuned. We further demonstrate that this shift can be exploited in order to spectroscopically monitor the vertical displacement of a nanocomposite in a fluorescence microscope. Large energetic shifts in the measured emission with displacement can be maximized, resulting in a displacement sensor with submicrometer resolution. We further show that the composite can be easily attached to biological samplesmore » and is able to measure deformations with high temporal and spatial precision.« less

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1];  [3]; ORCiD logo [4];  [2];  [4];  [5];  [1]; ORCiD logo [1];  [2]; ORCiD logo [6]; ORCiD logo [7]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States); Univ. of Hamburg, Hamburg (Germany)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); JX Nippon Oil & Energy Corporation, Naka-ku, Yokohama-shi, Kanagawa (Japan)
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Kavli Energy NanoScience Inst., Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1532226
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 11; Journal Issue: 2; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; quantum dots; inner filter effect; nanocomposite; photon recycling; sensor; photoluminescence; fluorescence

Citation Formats

Koc, Matthew A., Raja, Shilpa N., Hanson, Lindsey A., Nguyen, Son C., Borys, Nicholas J., Powers, Alexander S., Wu, Siva, Takano, Kaori, Swabeck, Joseph K., Olshansky, Jacob H., Lin, Liwei, Ritchie, Robert O., and Alivisatos, A. Paul. Characterizing Photon Reabsorption in Quantum Dot-Polymer Composites for Use as Displacement Sensors. United States: N. p., 2017. Web. doi:10.1021/acsnano.6b08277.
Koc, Matthew A., Raja, Shilpa N., Hanson, Lindsey A., Nguyen, Son C., Borys, Nicholas J., Powers, Alexander S., Wu, Siva, Takano, Kaori, Swabeck, Joseph K., Olshansky, Jacob H., Lin, Liwei, Ritchie, Robert O., & Alivisatos, A. Paul. Characterizing Photon Reabsorption in Quantum Dot-Polymer Composites for Use as Displacement Sensors. United States. doi:10.1021/acsnano.6b08277.
Koc, Matthew A., Raja, Shilpa N., Hanson, Lindsey A., Nguyen, Son C., Borys, Nicholas J., Powers, Alexander S., Wu, Siva, Takano, Kaori, Swabeck, Joseph K., Olshansky, Jacob H., Lin, Liwei, Ritchie, Robert O., and Alivisatos, A. Paul. Thu . "Characterizing Photon Reabsorption in Quantum Dot-Polymer Composites for Use as Displacement Sensors". United States. doi:10.1021/acsnano.6b08277. https://www.osti.gov/servlets/purl/1532226.
@article{osti_1532226,
title = {Characterizing Photon Reabsorption in Quantum Dot-Polymer Composites for Use as Displacement Sensors},
author = {Koc, Matthew A. and Raja, Shilpa N. and Hanson, Lindsey A. and Nguyen, Son C. and Borys, Nicholas J. and Powers, Alexander S. and Wu, Siva and Takano, Kaori and Swabeck, Joseph K. and Olshansky, Jacob H. and Lin, Liwei and Ritchie, Robert O. and Alivisatos, A. Paul},
abstractNote = {The reabsorption of photoluminescence within a medium, an effect known as the inner filter effect (IFE), has been well studied in solutions, but has garnered less attention in regards to solid-state nanocomposites. Photoluminescence from a quantum dot (QD) can selectively excite larger QDs around it resulting in a net red-shift in the reemitted photon. In CdSe/CdS core/shell QD-polymer nanocomposites, we observe a large spectral red-shift of over a third of the line width of the photoluminescence of the nanocomposites over a distance of 100 μm resulting from the IFE. Unlike fluorescent dyes, which do not show a large IFE red-shift, QDs have a component of inhomogeneous broadening that originates from their size distribution and quantum confinement. By controlling the photoluminescence broadening as well as the sample dispersion and concentration, we show that the magnitude of the IFE within the nanocomposite can be tuned. We further demonstrate that this shift can be exploited in order to spectroscopically monitor the vertical displacement of a nanocomposite in a fluorescence microscope. Large energetic shifts in the measured emission with displacement can be maximized, resulting in a displacement sensor with submicrometer resolution. We further show that the composite can be easily attached to biological samples and is able to measure deformations with high temporal and spatial precision.},
doi = {10.1021/acsnano.6b08277},
journal = {ACS Nano},
number = 2,
volume = 11,
place = {United States},
year = {2017},
month = {1}
}

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Works referencing / citing this record:

Facile synthesis of homochiral compounds integrating circularly polarized luminescence and two-photon excited fluorescence
journal, January 2019

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