Matches in SemOpenAlex for { <https://semopenalex.org/work/W2113521787> ?p ?o ?g. }
Showing items 1 to 88 of
88
with 100 items per page.
- W2113521787 abstract "This thesis presents an investigation into the factors which control the gain and amplification properties in conjugated materials. Conjugated polymers and perylene dyes are highly fluorescent, are easy to process into thin films, and exhibit strong amplification over a broad gain bandwidth making them ideal for use in lasers and amplifiers. The stimulated emission created when thin films of the red emitting polymer poly(2-methoxy-5-(2'-ethylhexyloxy)- p-phenylenvinylene) (MEH-PPV) were photoexcited with high energy laser pulses was investigated. This was characterised by a dramatic narrowing of the emission spectrum which has been assigned to amplified spontaneous emission (ASE). The emission was found to have a gaussian profile and the gain coefficient was found to be 4 cm-1.The temperature dependence of the absorption, photoluminescence and ASE of films of MEH-PPV was measured. The effect of film morphology on the photophysical properties was investigated by using films cast from two spinning solvents, chlorobenzene (CB) and tetrahydrofuran (THE). Film morphology was found to greatly affect the temperature dependence. A particularly important property is the spectral position of the ASE and the factors which affect it. By controlling the film thickness close to the cut-off thickness for waveguiding in the polymer film it was shown that the peak position of the ASE could be tuned by 31 nm. Modelling of the waveguide modes in the polymer films was used to explain this effect. The cut-off wavelength for each film was measured and good agreement with the theory was found. In order to investigate ways in which energy transfer could be used to control the emission, two perylene dyes were used as a donor-acceptor pair in a host matrix of poly methymethacralate (PMMA). The position of the ASE was found to depend on the acceptor concentration. Measurements of the photoluminescence quantum yield and time-resolved luminescence measurements showed that the energy transfer coefficient was 5x10(^11)mol(^-1)d(^3)" @default.
- W2113521787 created "2016-06-24" @default.
- W2113521787 creator A5062695366 @default.
- W2113521787 date "2001-01-01" @default.
- W2113521787 modified "2023-09-26" @default.
- W2113521787 title "Control of gain in conjugated polymers and perylene dyes" @default.
- W2113521787 cites W1855729489 @default.
- W2113521787 cites W1988332460 @default.
- W2113521787 cites W2025308916 @default.
- W2113521787 cites W2072042951 @default.
- W2113521787 cites W578655337 @default.
- W2113521787 hasPublicationYear "2001" @default.
- W2113521787 type Work @default.
- W2113521787 sameAs 2113521787 @default.
- W2113521787 citedByCount "0" @default.
- W2113521787 crossrefType "dissertation" @default.
- W2113521787 hasAuthorship W2113521787A5062695366 @default.
- W2113521787 hasConcept C112613896 @default.
- W2113521787 hasConcept C113196181 @default.
- W2113521787 hasConcept C120665830 @default.
- W2113521787 hasConcept C121332964 @default.
- W2113521787 hasConcept C125287762 @default.
- W2113521787 hasConcept C148869448 @default.
- W2113521787 hasConcept C159985019 @default.
- W2113521787 hasConcept C171250308 @default.
- W2113521787 hasConcept C178790620 @default.
- W2113521787 hasConcept C185592680 @default.
- W2113521787 hasConcept C19067145 @default.
- W2113521787 hasConcept C192562407 @default.
- W2113521787 hasConcept C194564183 @default.
- W2113521787 hasConcept C2779189646 @default.
- W2113521787 hasConcept C30282128 @default.
- W2113521787 hasConcept C37829102 @default.
- W2113521787 hasConcept C49040817 @default.
- W2113521787 hasConcept C520434653 @default.
- W2113521787 hasConcept C521977710 @default.
- W2113521787 hasConcept C75473681 @default.
- W2113521787 hasConcept C85080765 @default.
- W2113521787 hasConcept C91881484 @default.
- W2113521787 hasConceptScore W2113521787C112613896 @default.
- W2113521787 hasConceptScore W2113521787C113196181 @default.
- W2113521787 hasConceptScore W2113521787C120665830 @default.
- W2113521787 hasConceptScore W2113521787C121332964 @default.
- W2113521787 hasConceptScore W2113521787C125287762 @default.
- W2113521787 hasConceptScore W2113521787C148869448 @default.
- W2113521787 hasConceptScore W2113521787C159985019 @default.
- W2113521787 hasConceptScore W2113521787C171250308 @default.
- W2113521787 hasConceptScore W2113521787C178790620 @default.
- W2113521787 hasConceptScore W2113521787C185592680 @default.
- W2113521787 hasConceptScore W2113521787C19067145 @default.
- W2113521787 hasConceptScore W2113521787C192562407 @default.
- W2113521787 hasConceptScore W2113521787C194564183 @default.
- W2113521787 hasConceptScore W2113521787C2779189646 @default.
- W2113521787 hasConceptScore W2113521787C30282128 @default.
- W2113521787 hasConceptScore W2113521787C37829102 @default.
- W2113521787 hasConceptScore W2113521787C49040817 @default.
- W2113521787 hasConceptScore W2113521787C520434653 @default.
- W2113521787 hasConceptScore W2113521787C521977710 @default.
- W2113521787 hasConceptScore W2113521787C75473681 @default.
- W2113521787 hasConceptScore W2113521787C85080765 @default.
- W2113521787 hasConceptScore W2113521787C91881484 @default.
- W2113521787 hasLocation W21135217871 @default.
- W2113521787 hasOpenAccess W2113521787 @default.
- W2113521787 hasPrimaryLocation W21135217871 @default.
- W2113521787 hasRelatedWork W1508240633 @default.
- W2113521787 hasRelatedWork W1862582355 @default.
- W2113521787 hasRelatedWork W1915023683 @default.
- W2113521787 hasRelatedWork W1991134318 @default.
- W2113521787 hasRelatedWork W2024302235 @default.
- W2113521787 hasRelatedWork W2025245840 @default.
- W2113521787 hasRelatedWork W2027840984 @default.
- W2113521787 hasRelatedWork W2032958813 @default.
- W2113521787 hasRelatedWork W2061423383 @default.
- W2113521787 hasRelatedWork W2769351975 @default.
- W2113521787 hasRelatedWork W2802480734 @default.
- W2113521787 hasRelatedWork W2804443104 @default.
- W2113521787 hasRelatedWork W2804970494 @default.
- W2113521787 hasRelatedWork W2956024799 @default.
- W2113521787 hasRelatedWork W3041370686 @default.
- W2113521787 hasRelatedWork W3094892121 @default.
- W2113521787 hasRelatedWork W3111027039 @default.
- W2113521787 hasRelatedWork W3142400427 @default.
- W2113521787 hasRelatedWork W3191641359 @default.
- W2113521787 hasRelatedWork W3088783378 @default.
- W2113521787 isParatext "false" @default.
- W2113521787 isRetracted "false" @default.
- W2113521787 magId "2113521787" @default.
- W2113521787 workType "dissertation" @default.