Gain and ultrafast optical switching in PMMA optical fibers and films doped with luminescent conjugated polymers and oligomers

Charas, Ana; Mendonça, A. Luísa; Clark, Jenny; Cabanillas‐González, Juan; Bazzana, Luca; Nocivelli, A.; Lanzani, Guglielmo; Morgado, Jorge

doi:10.1007/s12200-009-0092-y

Cited by 12 publications

(11 citation statements)

References 19 publications

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“…Apart from its particularly large cross sections, it has high photochemical stability, which is important in practice to withstand multiple excitation cycles with a pulsed pump laser [14,15]. Moreover, the photostability achieved with RB-doped POFs is greater than that accomplished with most dyes [16,17]. If high-energy photons are used (as in the proximity of the ultraviolet region), photo bleaching can occur [14], which can limit the maximum energy of the pump pulses for some dyes.…”

Section: Open Accessmentioning

confidence: 99%

Polymer-Optical-Fiber Lasers and Amplifiers Doped with Organic Dyes

et al. 2011

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Polymer optical fibers (POFs) doped with organic dyes can be used to make efficient lasers and amplifiers due to the high gains achievable in short distances. This paper analyzes the peculiarities of light amplification in POFs through some experimental data and a computational model capable of carrying out both power and spectral analyses. We investigate the emission spectral shifts and widths and on the optimum signal wavelength and pump power as functions of the fiber length, the fiber numerical aperture and the radial distribution of the dopant. Analyses for both step-index and graded-index POFs have been done.

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Section: Open Accessmentioning

confidence: 99%

Polymer-Optical-Fiber Lasers and Amplifiers Doped with Organic Dyes

et al. 2011

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“…This phase separation represents poor compatibility between two materials, which can be induced by temperature, magnetic field, processing method, and even film thickness . Strong phase separation leads high optical loss due to scattering, reflection, or optical path changes . Therefore, optical gain will be hugely decreased or even disappear when polymer optical gain materials are blended with PMMA or PS.…”

Section: Introductionmentioning

confidence: 99%

Gain Properties and Distributed Feedback Laser Performance of 7F6/Poly(Styrene) Blend Films: Potential Core Material for Plastic Optical Fiber Expanding the Bandwidth to Visible Region

Zhang

et al. 2018

Macro Chemistry & Physics

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Optical gain properties of blue emission oligomer 7‐unit 9,9‐dihexylfluorene (7F6) and its blends with polystyrene (PS) are reported. 7F6 demonstrates high photoluminescence quantum yield (65%), low amplified spontaneous emission threshold (EthASE = 0.6 kW cm−2), high gain coefficient (g = 90.9 cm−1), and extremely low distributed feedback laser threshold (Ethlaser = 86 W cm−2). Unlike polymer gain materials, the phase separation between 7F6 and PS is small even in a high blending ratio. The 70 and 50 wt% 7F6/PS blends display excellent gain properties with g = 70.7 and 64.3 cm−1, EthASE = 1.1 and 2.1 kW cm−2, and Ethlaser = 0.3 and 0.41 kW cm−2, respectively. The photostability and thermal stability are improved significantly by blending 7F6 into PS. These results promise 7F6/PS blends as a potential core material for expanding the bandwidth of plastic optical fiber.

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“…For instance, the net optical gain coefficient of PFO is ≈74 cm −1 , while those of poly(9,9‐dioctylfluorene‐ co ‐benzothiadiazole) F8BT and Red F are only 22 and 24 cm −1 , respectively . Shifting the emission to longer wavelengths leads to an increased spectral overlap between stimulated emission and excited‐state absorption, triggering exciton–exciton annihilation processes due to exciton diffusion and enhanced exciton–exciton Förster radius in low bandgap CPs . Therefore, alternative strategies are required in order to manipulate independently molecular orbitals and emission properties while leaving unaltered optical gain properties of the gain medium material.…”

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confidence: 99%

Concurrent Optical Gain Optimization and Electrical Tuning in Novel Oligomer:Polymer Blends with Yellow‐Green Laser Emission

et al. 2018

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Electrically pumped organic lasing requires the integration of electrodes contact into the laser cavity in an organic light‐emitting diode (OLED) or organic field effect transistor configuration to enable charge injection. Efficient and balanced carrier injection requires in turn alignment of the energy levels of the organic active layers with the Fermi levels of the cathode and anode. This can be achieved through chemical substitution with specific aromatic functional groups, although paying the price for a substantial (and often detrimental) change in the emission and light amplifying properties of the organic gain medium. Here, using host–guest energy transfer mixtures with hosts bearing a systematic and gradual shift in molecular orbitals is proposed, which reduces the amplified spontaneous emission (ASE) threshold of the organic gain medium significantly while leaving the peak emission unaffected. By virtue of the low guest doping required for complete host‐to‐guest energy transfer, the injection levels in the blends are attributed to the host whereas the gain properties solely depend on the guest. It is demonstrated that the ASE peak and thresholds of blends with different hosts do not differ while the current efficiency of OLEDs devices is deeply influenced by molecular orbital tuning of the hosts.

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Gain and ultrafast optical switching in PMMA optical fibers and films doped with luminescent conjugated polymers and oligomers

Cited by 12 publications

References 19 publications

Polymer-Optical-Fiber Lasers and Amplifiers Doped with Organic Dyes

Polymer-Optical-Fiber Lasers and Amplifiers Doped with Organic Dyes

Gain Properties and Distributed Feedback Laser Performance of 7F6/Poly(Styrene) Blend Films: Potential Core Material for Plastic Optical Fiber Expanding the Bandwidth to Visible Region

Concurrent Optical Gain Optimization and Electrical Tuning in Novel Oligomer:Polymer Blends with Yellow‐Green Laser Emission

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