Ultralow-threshold up-converted lasing in oligofluorenes with tailored strong nonlinear absorption
| Autor: | Martin D. Dawson, Nicolas Laurand, Clara Orofino-Pena, Alexander L. Kanibolotsky, Burak Guzelturk, Peter J. Skabara, Hilmi Volkan Demir |
|---|---|
| Přispěvatelé: | Demir, Hilmi Volkan |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Nonlinear absorptions
Amplified spontaneous emission Materials science Nonlinear optics Nonlinear optical response 02 engineering and technology Optical gain Fluorene Conjugated system Conjugated polymers 010402 general chemistry 01 natural sciences Photodynamic therapy law.invention chemistry.chemical_compound law Integrated applications Non-linear optical properties Structure property relationships Materials Chemistry Organic lasers QD Absorption (electromagnetic radiation) chemistry.chemical_classification Semiconductor lasers Photons Optical properties business.industry Organic polymers Two-photon absorption cross section General Chemistry Polymer Molecules Two photon processes 021001 nanoscience & nanotechnology Laser Stars 0104 chemical sciences Organic semiconductor chemistry Oligomers Small organic molecules Amplified spontaneous emissions Optoelectronics 0210 nano-technology business Lasing threshold |
| Zdroj: | Journal of Materials Chemistry C |
| ISSN: | 2050-7526 |
| Popis: | Nonlinear optical response in organic semiconductors has been an attractive property for many practical applications. For frequency up-converted lasers, to date, conjugated polymers, fluorescent dyes and small organic molecules have been proposed but their performances have been severely limited due to the difficulty in simultaneously achieving strong nonlinear optical response and high performance optical gain. In this work, we show that structurally designed truxene-based star-shaped oligofluorenes exhibit strong structure-property relationships enabling enhanced nonlinear optical response with favorable optical gain performance. As the number of fluorene repeat units in each arm is increased from 3 to 6, these molecules demonstrate a two-photon absorption cross-section as high as 2200 GM, which is comparable to that of linear conjugated polymers. Tailored truxene oligomers with six fluorene units in each arm (T6) show two-photon absorption pumped amplified spontaneous emission with a threshold as low as 2.43 mJ cm-2, which is better than that of the lowest reported threshold in organic semiconductors. Furthermore, we show a frequency up-converted laser using the newly designed and synthesized star-shaped oligomer T6 with a threshold as low as 3.1 mJ cm-2, which is more than an order of magnitude lower than that of any conjugated polymer. Thus, these oligomers with enhanced nonlinear optical properties are highly attractive for bio-integrated applications such as photodynamic therapy and in vivo bio-sensing. © The Royal Society of Chemistry 2015. |
| Databáze: | OpenAIRE |
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