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Mesostructured Composite Materials with Electrically Tunable Upconverting Properties.

Haridas Mundoor1, Ivan I Smalyukh1,2

  • 1Department of Physics and Department of Electrical, Computer and Energy Engineering, Materials Science and Engineering Program, and Liquid Crystal Materials Research Center, University of Colorado, Boulder, CO, 80309, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|September 3, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created self-aligning nanorod dispersions in liquid crystals. Electrical switching tunes upconversion and luminescence, offering tunable optical properties for novel materials.

Keywords:
electric switchingliquid crystalsorientational orderpolarized luminescenceupconversion, nanoparticles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Mesostructured materials combine nanoparticle properties with soft matter ordering.
  • Controlling nanoparticle alignment is key to novel material functionalities.

Purpose of the Study:

  • To design and realize orientationally ordered nematic liquid crystalline dispersions of rod-like upconversion nanoparticles.
  • To investigate the tunable optical properties of these composites through electrical switching.

Main Methods:

  • Surface functionalization of rod-like upconversion nanoparticles.
  • Dispersion in a thermotropic nematic liquid crystal host.
  • Characterization of spectral and polarization dependencies under electrical switching.

Main Results:

  • Achieved spontaneous unidirectional self-alignment of nanoparticles coupled to liquid crystal orientation.
  • Demonstrated tunable upconversion and polarized luminescence properties by electrically switching the liquid crystal host at low voltages (≈ 1 V).

Conclusions:

  • The developed composite materials exhibit electrically tunable optical properties.
  • Potential applications in advanced optical devices and responsive materials.