Liquid Crystalline Order and Electric Switching of Upconversion Luminescence in Colloidal Nanorod Suspensions
- Department of PhysicsUniversity of Colorado Boulder CO 80309 USA
- Laboratoire de Physique des SolidesCNRSUniversité Paris‐SudUniversité Paris‐Saclay 91405 Orsay France
- Department of PhysicsUniversity of Colorado Boulder CO 80309 USA; National Renewable Energy Laboratory Golden CO 80401 USA; Renewable and Sustainable Energy InstituteNational Renewable Energy Laboratory and University of Colorado Boulder CO 80309 USA
- Department of PhysicsUniversity of Colorado Boulder CO 80309 USA; Renewable and Sustainable Energy InstituteNational Renewable Energy Laboratory and University of Colorado Boulder CO 80309 USA; Department of ElectricalComputer and Energy EngineeringMaterials Science Engineering Program, and Soft Materials Research CenterUniversity of Colorado Boulder CO 80309 USA
Abstract The polarization‐dependent photon upconversion luminescence properties of large‐scale orientationally ordered soft matter systems formed by colloidal nanorods dispersed in an isotropic solvent are studied. The electrostatically charged photon‐upconverting nanorods form an isotropic dispersion at low concentrations, whereas orientational order and a nematic phase emerge at high concentrations. When an alternating electric field is applied, particles align in the direction of the electric field in both nematic and isotropic phases, though the nature of this electric switching is different in these two phases. Owing to the long‐range orientational order in the nematic phase, the upconversion luminescence from the particles is polarized without an external field. Polarization dependence of these properties can also be electrically induced in an isotropic phase of the colloidal nanorods. Further, the dynamics of switching of photon upconversion luminescence in both nematic and isotropic dispersions are explored and their potential technological uses are dicussed.
- Research Organization:
- National Renewable Energy Laboratory (NREL), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC36-08GO28308; DE‐AC36‐08GO28308
- OSTI ID:
- 1505079
- Alternate ID(s):
- OSTI ID: 1494954
- Report Number(s):
- NREL/JA-5900-73053
- Journal Information:
- Advanced Optical Materials, Vol. 7, Issue 9; ISSN 2195-1071
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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