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Contrasting anisotropy of light absorption and emission by semiconductor nanoparticles

Yera Ussembayev (UGent) , Zeger Hens (UGent) and Kristiaan Neyts (UGent)
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Abstract
Photon absorption and emission play a key role in our understanding of how light interacts with matter. An attractive system to explore these processes are semiconductor nanoparticles (SNP) with their distinguishable photoluminescence, which makes them widely applied in optoelectronics, laser technology, and biophotonics. In current implementations of SNP, there is only partial control over anisotropy in absorption or in emission, which limits their applicability in photonics. An emerging strategy to attain a certain degree of anisotropy is to embed a quantum dot in semiconductor shell structure. Here, we report how designing the shell geometry and the position of the quantum dot enables extended control over the anisotropy in absorption and emission by a core/shell nanoparticle in a solvent. Based on the dielectric effect, our approach provides an accessible route to achieve sharply contrasting anisotropies that may even have an opposite sign. Using this unique feature, we propose cross particles to transform unpolarized blue light into polarized red and green light for liquid crystal backlights and thumbtack particles to absorb sunlight and efficiently emit photons in a solar concentrator. The strong anisotropic contrast between absorption and emission of SNP may advance energy-efficient technology, biodiagnostics, and quantum information, as well as offer new insights on light–matter interaction at the nanoscale.
Keywords
anisotropic absorption, anisotropic emission, core/shell nanoparticles, nanooptics, quantum dots

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Please use this url to cite or link to this publication:

Chicago
Ussembayev, Yera, Zeger Hens, and Kristiaan Neyts. 2019. “Contrasting Anisotropy of Light Absorption and Emission by Semiconductor Nanoparticles.” Acs Photonics.
APA
Ussembayev, Y., Hens, Z., & Neyts, K. (2019). Contrasting anisotropy of light absorption and emission by semiconductor nanoparticles. ACS PHOTONICS.
Vancouver
1.
Ussembayev Y, Hens Z, Neyts K. Contrasting anisotropy of light absorption and emission by semiconductor nanoparticles. ACS PHOTONICS. 2019;
MLA
Ussembayev, Yera, Zeger Hens, and Kristiaan Neyts. “Contrasting Anisotropy of Light Absorption and Emission by Semiconductor Nanoparticles.” ACS PHOTONICS (2019): n. pag. Print.
@article{8601460,
  abstract     = {Photon absorption and emission play a key role in our understanding of how light interacts with matter. An attractive system to explore these processes are semiconductor nanoparticles (SNP) with their distinguishable photoluminescence, which makes them widely applied in optoelectronics, laser technology, and biophotonics. In current implementations of SNP, there is only partial control over anisotropy in absorption or in emission, which limits their applicability in photonics. An emerging strategy to attain a certain degree of anisotropy is to embed a quantum dot in semiconductor shell structure. Here, we report how designing the shell geometry and the position of the quantum dot enables extended control over the anisotropy in absorption and emission by a core/shell nanoparticle in a solvent. Based on the dielectric effect, our approach provides an accessible route to achieve sharply contrasting anisotropies that may even have an opposite sign. Using this unique feature, we propose cross particles to transform unpolarized blue light into polarized red and green light for liquid crystal backlights and thumbtack particles to absorb sunlight and efficiently emit photons in a solar concentrator. The strong anisotropic contrast between absorption and emission of SNP may advance energy-efficient technology, biodiagnostics, and quantum information, as well as offer new insights on light--matter interaction at the nanoscale.},
  author       = {Ussembayev, Yera and Hens, Zeger and Neyts, Kristiaan},
  issn         = {2330-4022},
  journal      = {ACS PHOTONICS},
  language     = {eng},
  title        = {Contrasting anisotropy of light absorption and emission by semiconductor nanoparticles},
  url          = {http://dx.doi.org/10.1021/acsphotonics.8b01405},
  year         = {2019},
}

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