Specific features of luminescence quenching in a nematic liquid crystal doped with nanoparticles
| Autor: | D. P. Shcherbinin, Elena A. Konshina, M. A. Kurochkina |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Quenching
Photoluminescence Materials science Doping Analytical chemistry Nanoparticle Nanotechnology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Ion Liquid crystal Dielectric loss 0210 nano-technology Luminescence |
| Zdroj: | Optics and Spectroscopy. 121:585-591 |
| ISSN: | 1562-6911 0030-400X |
| DOI: | 10.1134/s0030400x16100118 |
| Popis: | The change in the intensity of the photoluminescence (PL) spectra of nematic liquid crystal (NLC) composites as a function of the concentration of CdSe/ZnS semiconductor quantum dots (QDs) and TiO2 and ZrO2 nanoparticles ~5 nm in diameter has been investigated. It is shown that the PL-quenching intensity in composites with CdSe/ZnS QDs exceeds that in composites with TiO2 and ZrO2 nanoparticles. The lowfrequency spectra of these composites with a concentration of 0.1 wt %, recorded in the range of 102–103 Hz, and the content of mobile ions in them have been investigated. It is found that the dielectric loss in the composite with CdSe/ZnS QDs is much higher and the content of mobile ions is larger by a factor of 3 than in the composites with TiO2 and ZrO2 nanoparticles. It is shown that an increase in the CdSe/ZnS QD concentration in NLC composites leads to an increase in the dielectric loss and a decrease in the PL intensity. Possible mechanisms of the interaction between NLC molecules and CdSe/ZnS QDs are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|