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Publikācija: Hyper-Rayleigh Scattering and Two-Photon Luminescence of Phenylamine-Indandione Chromophores

Publication Type Conference paper
Funding for basic activity Unknown
Defending: ,
Publication language English (en)
Title in original language Hyper-Rayleigh Scattering and Two-Photon Luminescence of Phenylamine-Indandione Chromophores
Field of research 1. Natural sciences
Sub-field of research 1.4 Chemical sciences
Research platform Materials, Processes, and Technologies
Authors Igors Mihailovs
Jana Kreicberga
Valdis Kampars
S. Miasojedovas
S. Juršenas
L. Skuja
M. Rutkis
Keywords Background noise; First hyperpolarizabilities; Hyper Rayleigh scattering; NLO-chromophore; Phenyl group; Quantum chemical; Triphenylamine derivatives; Two-photon luminescence
Abstract Based on results of quantum chemical (QC) screening, we put under research several phenylamine indane-1,3-dione derivatives including octupolar NLO chromophore A3BI. According to these calculations, molecular first hyperpolarizability (βHRS) should be enhanced upon replacement of methyl substituents with phenyl groups. Surprisingly, βHRS values obtained in our measurements by hyper-Rayleigh scattering (HRS) are much higher than one could expect from QC. Bearing in mind that two-photon luminescence (TPL) is usual cause for overestimation of βHRS in HRS measurements, we have accomplished investigations of TPL properties of these compounds. All investigated triphenylamine derivatives exhibit strong TPL. In case of DANS and DMABI captured simultaneously, TPL spectra and HRS signal, reveal the least as clearly distinct on TPL background, thus TPL-free βHRS values can be defined. Concurrently, sharp HRS signal of DPABI is sinking in TPL and background noise along with increase in concentration. Due to fairly intensive TPL for other investigated triphenylamino compounds, the HRS signal was rather indistinguishable and therefore correct βHRS values could not be extracted.
Hyperlink: http://www.fmnt.lu.lv/fileadmin/user_upload/lu_portal/projekti/konference_fmnt/2012/FM_NT2012_FINAL_for_internet_2.pdf 
Reference Mihailovs, I., Kreicberga, J., Kampars, V., Miasojedovas, S., Juršenas, S., Skuja, L., Rutkis, M. Hyper-Rayleigh Scattering and Two-Photon Luminescence of Phenylamine-Indandione Chromophores. In: International Conference "Functional Materials and Nanotechnologies" (FM&NT-2012): Book of Abstracts, Latvia, Rīga, 17-20 April, 2012. Riga: Institute of Solid State Physics. University of Latvia, 2012, pp.197-197. ISBN 978-9984-45-496-2.
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