Stimulated emission from films of conjugated polymers and oligomers
| Autor: | van Hutten, PF, Brouwer, HJ, Krasnikov, VV, Gill, RE, Hadziioannou, G, Kafafi, ZH |
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| Přispěvatelé: | Polymer Chemistry and Bioengineering |
| Jazyk: | angličtina |
| Rok vydání: | 1997 |
| Předmět: |
Quantitative Biology::Biomolecules
poly(p-phenylenevinylene) genetic structures stimulated emission Physics::Optics eye diseases conjugation length electroluminescence laser Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science block copolymers chromophore photoluminescence oligomers |
| Zdroj: | ORGANIC LIGHT-EMITTING MATERIALS AND DEVICES, 14-21 STARTPAGE=14;ENDPAGE=21;TITLE=ORGANIC LIGHT-EMITTING MATERIALS AND DEVICES |
| Popis: | Oligomers and block copolymers structurally related to PPV were investigated under intense optical excitation. Their well-defined molecular structure allows a better control of emission properties than is usually feasible in semiconducting polymers. Stimulated emission is demonstrated in single crystals of PPV-type oligomers, and also in thin films obtained by spincasting of copolymers containing PPV-type blocks. Waveguiding is shown to provide the length of interaction required for mirrorless laser generation. Thin films of oligomers obtained through deposition from the vapor phase are polycrystalline, and the optical losses in the as-deposited films are too large for lasing to be achieved. These films show stimulated emission only after the domain size has been increased by annealing. Lasing occurs within individual crystalline domains with a threshold value comparable to that found for optically clear amorphous films of conjugated polymers. |
| Databáze: | OpenAIRE |
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