Nonlinear optical properties of organic and polymeric materials
29 Sep 1983-
About: The article was published on 1983-09-29 and is currently open access. It has received 762 citations till now.
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TL;DR: In this article, the synthesis and evaluation of organo-metallic dyes as second-order nonlinear optical (SONLO) material was discussed, and new dyes have been synthesised via Knovoenagel reactions of ferrocene carboxyaldehyde and two active methylene compounds.
Abstract: Purpose – To discuss synthesis and evaluation of organo‐metallic dyes as second‐order nonlinear optical (SONLO) material.Design/methodology/approach – New dyes have been synthesised via Knovoenagel reactions of ferrocene carboxyaldehyde and two active methylene compounds.Findings – The ferrocenyl dyes prepared have shown bathochromic shift and thermal stability.Practical implications – These compounds have UV‐Vis bathochromic shift, enabling them to be used as SONLO materials as well as dyes.Originality/value – The paper provides further information on the thermal studies of these types of molecules.
3 citations
Journal Article•
TL;DR: In this article, the photoluminescence (PL) characteristics of merocyanine dye molecules in ionic liquids of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) with different purity grades were investigated.
Abstract: The photoluminescence (PL) characteristics of merocyanine dye molecules in ionic liquids of 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM]PF6) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM]BF4) with different purity grades were investigated. The absorption spectra for this dye in all the ionic liquid solvents investigated looked very similar while the PL emission spectra differed markedly depending on the type of ionic liquid and the impurity content. In all purity grades of [BMIM]BF4 and the ultrahigh grade of [BMIM]PF6, the PL spectra of these merocyanine solutions showed a single peak around 480 nm. However, when a lower grade of [BMIM]PF6 was used as the solvent, an additional PL peak appeared around 575 nm. The deprotonation from the hydroxyl group of the merocyanine molecule after photoexcitation is proposed to explain the phenomenon in this unique solvent system.
3 citations
TL;DR: In this paper, the second-order nonlinear optical susceptibility of polymers is predicted by a sum-over-states method in which the energy bands are calculated using extended Huckel theory and the excited states are produced by band to band transitions.
3 citations
TL;DR: In this article, the photophysical properties of a few (anthracen-9-yl)methanamines were analyzed and a relation between the rate of the photochemical reaction, free energy change and quenching of excited states was established.
Abstract: This article deals with the photophysical properties of a few (anthracen-9-yl)methanamines. Analysis of absorption and the fluorescence emission spectra of these compounds indicated intramolecular photoinduced electron transfer leading to quenching of excited states, the efficiency of which depends on the geometrical constraints and electronic factors pertaining to the molecule. The decay kinetics studied using Time Correlated Single Photon Counting showed a bi-exponential decay indicating the involvement of two transient species in the excited state of these molecules. Also, we build up a relation between the rate of the photochemical reaction, free energy change and quenching of excited states.
3 citations
TL;DR: In this article, the authors have succeeded in controlling organic-crystal orientation in glass capillaries using the modified Bridgman-Stockbarger method, in which the pulling direction of the capillary is at an angle theta to the temperature gradient.
Abstract: The authors have succeeded in controlling organic-crystal orientation in glass capillaries using the modified Bridgman-Stockbarger method, in which the pulling direction of the capillary is at an angle theta to the temperature gradient. The controllability of the crystal orientation in the organic-crystal-cored fibre (OCCF) of 2-methyl-4-nitroaniline (MNA) was examined by the measurement of the second-harmonic generation power. It was confirmed that the second-harmonic power of the controlled OCCF is three times higher than that of the uncontrolled OCCF, since the axis with the largest second-order nonlinear optical susceptibility coefficient is tilted from the fibre axis in the controlled OCCF. The control mechanism for the crystal orientation is also discussed.
3 citations