FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W22084788> ?p ?o ?g. }

• W22084788 abstract "The rapid development of laser technology results in new and powerful lasers operating at a variety of wavelengths. At the same time lasers have found its use in many electronic devices and instruments used in both civilian and military applications. However, lasers are also found to be an effective threat for blinding and destroying optical sensors. Therefore, the need for useful protection devices has increased. A protective device, constructed from nonlinear absorbing materials, can absorb the high intensity light, while at the same time keeping the device transparent for normal operation of the sensor. In this thesis, a series of square planar trans-diarylalkynyl-bis(tributyl-phosphine) platinum(II) complexes have been investigated for their photo-physical properties and optical power limiting (OPL) capabilities. The main objectives have been to establish methodologies for characterization of quantum efficiency, twophoton absorption cross section and excited state absorption of triplet states. These methods were applied along with absorption and time-resolved luminescence spectroscopy and OPL to characterize new materials. Also, the photophysical characterization of a series of three Coumarin molecules suitable for reference purposes in the determination of quantum efficiencies and two-photon absorption cross sections of new samples are presented (Paper VI). For the compounds investigated in Paper I and II, thiophene groups and methoxy substituents were inserted into the structure in an attempt to increase the nonlinear properties and OPL capabilities compared to a pure phenylcontaining analogue. In Paper III, a new synthetic route was developed for the compounds utilizing the click chemistry method through triazole formation. The introduced thiophene and triazole units were placed at different positions in the structure to investigate its effect on the photo-physical properties. Placed at different positions in the structure, the new rings were found to affect the conjugation of the ligands. Spectral shifts and shorter phosphorescence lifetimes were observed as the rings were placed closer to the Pt-atom. In Paper IV the important triplet state absorption and relaxation processes were investigated for all compounds in Paper I− III, together with four new molecules. Methyl substituents were inserted as a means to control the ligand rotation, and a molecule with two different ligands were prepared to investigate the effect on the optical properties from a non-symmetric compound. Excited state absorption from the triplet state was found to be strong for all molecules, with extinction coefficients in the range 1 − 10 · 104 M−1 cm −1. In Paper V, some of the molecules were incorporated into solid PMMA glasses. The photo-physical properties of the compounds in both low and high concentrated PMMA glasses were investigated and compared to similar samples prepared in solution. New excitation bands were observed at high concentrations both in liquid and solid state. Finally, using a pulse-propagation simulation method, the OPL performance of materials with photo-physical parameters typical for the investigated molecules, were examined. It was found that the triplet excited state absorption is the dominating process in operation around 532 nm for 5 ns pulses." @default.
• W22084788 created "2016-06-24" @default.
• W22084788 creator A5044592147 @default.
• W22084788 creator A5052435087 @default.
• W22084788 date "2009-01-01" @default.
• W22084788 modified "2023-09-23" @default.
• W22084788 title "Two-photon absorption cross-section and quantum efficiency of molecular fluorophoresfor spectroscopic reference purposes" @default.
• W22084788 hasPublicationYear "2009" @default.
• W22084788 type Work @default.
• W22084788 sameAs 22084788 @default.
• W22084788 citedByCount "0" @default.
• W22084788 crossrefType "journal-article" @default.
• W22084788 hasAuthorship W22084788A5044592147 @default.
• W22084788 hasAuthorship W22084788A5052435087 @default.
• W22084788 hasConcept C119824511 @default.
• W22084788 hasConcept C120665830 @default.
• W22084788 hasConcept C121332964 @default.
• W22084788 hasConcept C125287762 @default.
• W22084788 hasConcept C159985019 @default.
• W22084788 hasConcept C185592680 @default.
• W22084788 hasConcept C192562407 @default.
• W22084788 hasConcept C32448512 @default.
• W22084788 hasConcept C49040817 @default.
• W22084788 hasConcept C520434653 @default.
• W22084788 hasConcept C52234038 @default.
• W22084788 hasConcept C62520636 @default.
• W22084788 hasConceptScore W22084788C119824511 @default.
• W22084788 hasConceptScore W22084788C120665830 @default.
• W22084788 hasConceptScore W22084788C121332964 @default.
• W22084788 hasConceptScore W22084788C125287762 @default.
• W22084788 hasConceptScore W22084788C159985019 @default.
• W22084788 hasConceptScore W22084788C185592680 @default.
• W22084788 hasConceptScore W22084788C192562407 @default.
• W22084788 hasConceptScore W22084788C32448512 @default.
• W22084788 hasConceptScore W22084788C49040817 @default.
• W22084788 hasConceptScore W22084788C520434653 @default.
• W22084788 hasConceptScore W22084788C52234038 @default.
• W22084788 hasConceptScore W22084788C62520636 @default.
• W22084788 hasLocation W220847881 @default.
• W22084788 hasOpenAccess W22084788 @default.
• W22084788 hasPrimaryLocation W220847881 @default.
• W22084788 hasRelatedWork W1968708144 @default.
• W22084788 hasRelatedWork W1977204179 @default.
• W22084788 hasRelatedWork W1979985148 @default.
• W22084788 hasRelatedWork W1987445731 @default.
• W22084788 hasRelatedWork W1990770461 @default.
• W22084788 hasRelatedWork W1997601423 @default.
• W22084788 hasRelatedWork W2033150166 @default.
• W22084788 hasRelatedWork W2043026662 @default.
• W22084788 hasRelatedWork W2044530701 @default.
• W22084788 hasRelatedWork W2119828468 @default.
• W22084788 hasRelatedWork W2161110923 @default.
• W22084788 hasRelatedWork W2335372435 @default.
• W22084788 hasRelatedWork W2882991253 @default.
• W22084788 hasRelatedWork W2929624869 @default.
• W22084788 hasRelatedWork W2948117279 @default.
• W22084788 hasRelatedWork W3022223438 @default.
• W22084788 hasRelatedWork W3089393799 @default.
• W22084788 hasRelatedWork W3095310440 @default.
• W22084788 hasRelatedWork W3186656500 @default.
• W22084788 hasRelatedWork W564009736 @default.
• W22084788 isParatext "false" @default.
• W22084788 isRetracted "false" @default.
• W22084788 magId "22084788" @default.
• W22084788 workType "article" @default.