Differently linked fluorene-carbazole triads for light amplification

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

“…Since the low attenuation window for the common matrix materials in POF is usually in the range near infrared range (650 nm for poly(methyl methacrylate) (PMMA) and 670 nm for poly(styrene) (PS)), the most widely used organic dopants are red emitters such as Perylene Red, Rhodamine B, Rhodamine‐640 and Rhodamine 6G . Some researchers also put their efforts on extending the bandwidth of POF to shorter wavelength range such as green or blue . However, the doping ratio of the organic dyes has to be low to avoid the quench of dye concentration to the emission.…”

Tuneable optical gain and broadband lasing driven in electrospun polymer fibers by high dye concentration

“…The synthesis procedure and optical properties in thin films of polystyrene (PS) have been reported previously. 37,38 FCF has shown to exhibit relatively weak concentration quenching due to the twisted molecular backbone and the presence of bulky ethyl and ethylhexyl groups. 38 Electrospun fibers (Fig.…”

Enhanced Energy Transfer in Doped Bifluorene Single Crystals: Prospects for Organic Lasers

“…Following our previous studies, for production of crystals we selected fluorene‐based small molecules that were proved to be a successful gain media owing to their high radiative rate ( k r ≈ 1 ns −1 ) . In this work, to produce host–dopant crystals we employed bifluorene derivatives, where BF‐a (host) and BF‐e (dopant) differed only by modification of acetylene and ethylene bridging groups, respectively ( Figure a).…”

“…Following our previous studies, for production of crystals we selected fluorene-based small molecules that were proved to be a successful gain media owing to their high radiative rate (k r ≈ 1 ns −1 ). [46][47][48][49][50] In this work, to produce host-dopant crystals we employed bifluorene derivatives, where BF-a (host) and BF-e (dopant) differed only by modification of acetylene and ethylene bridging groups, respectively (Figure 1a). Here, bridging groups performed several functions required for efficient hostdopant systems: i) bridge rigidity minimized torsional disorder in crystal and reduced exciton-vibronic coupling; ii) almost identical host and dopant molecular structures inhibited lattice defect formation; and iii) host-dopant energy gap difference provided sufficient spectral overlap for FRET.…”