Tunability is an important aspect of lasers. Nowadays there are many possible ways to achieve this advantageous property; however, dynamic tuning is limited. Red to InfraRed emissive dyes allow a direct visualization of molecular interactions, through deep tissue penetration, along with minimal tissue damage. In our studies we use simple systems based on a single dye-doped polymeric thin films for distributed feedback (DFB) and random lasing (RL) investigations. As active compounds we have applyed novel push-pull luminescent diphenylaminofluorene and tiophene derivatives, with different acceptor groups. Integration of such luminescent dyes with transparent polymeric medium allows fabricating real-time lasing tunability in the visible region and first biological window (650-950 nm). The observed spectral tuning of 150 nm is a groundbreaking value obtained in a single-dye system. Also Excited-State Intramolecular Proton Transfer (ESIPT) compounds, have attracted our considerable attention, due to their unique optical properties. In this contribution we show a novel bis-trimethylsilyl substituted 2-(2’hydroxyphenyl)benzothiazole (HBT) derivatives functionalized with a trifluoromethyl - a strong electron-withdrawing group. Such structure enabled real-time red-green-blue (RGB) switching of emission, both in solution and solid-state, providing white laser light emission. We show strong dependence on environment polarity, as well as Aggregation-Induced Emission Enhancement (AIEE) properties, and successful implementation of ESIPT molecules in DFB lasing, both in solution and solid-state.
White lasers are becoming increasingly relevant in various fields since they exhibit unprecedented properties in terms of beam brightness and intensity modulation. Here we show that in hybrid materials based on modified and/or dye-doped liquid crystals, white laser light can be effectively generated upon optical pumping. We demonstrate a multicolor stimulated emission phenomenon obtained in dye-doped, liquid crystalline systems or in a multifunctional phase-separation system based on polymer matrix encompassing liquid crystals and multiple organic chromophores, where the precise color adjustment can be provided by applying the external electric DC fields or pumping energy density. The use of liquid crystalline materials for laser light generation can bring several advantages, like better photostability comparing to polymeric lasers, easy tunability of emitted light, e.g., by applied of the electric field, low cost of fabrication, and multitude of randomly or precisely generated photonic structures, which can be controlled by the external fields.
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