Abstract
One of the most important drawback of organic dyes is their low photo-stability which reduces possibility of their commercial utilization. In this article we employ the strategy of dye re-crystallization from oversaturated matrix in order to enhance material’s durability. One of the main advantages of perylene derivative is ability to form emissive j-aggregates, good miscibility and incorporation into liquid crystalline matrix. Investigation of perylene-based dye and LC matrix brought as the result very efficient light amplification modulation by applied external electric field. In our article we show that Stimulated Emission (STE) is possible to achieve from perylene-derivative based system, at typical fluence thresholds for laser dyes: 3.9 mJ/cm2. Moreover, presented system proves ultra-high photostability, showing lack of STE reduction even after 12 000 excitation laser pulses. Furthermore, we proved the possibility of light emission intensity control using external electric field.
Highlights
Organic dyes possess many interesting features that make them attractive for optical purposes
In this work we focused our attention on the optical properties of perylene derivative, namely the 3,4,9,10-tetra-(7-alkoxy-carbonyl) perylene (TACP)
We have shown that introduced in this manuscript strategy of incorporating dyes like TACP, exhibiting the strong emission in aggregated form, into liquid crystals (LCs) matrices might be beneficial for the emissive LC materials
Summary
Similar increase of STE intensity for pumping beam fluence, kept at the level of 14.7 mJ/cm[2], can be achieved by applying the voltage of 6 volts to the sample In such a case slight red-shift of emission spectra can be observed. We set the energy density of exciting light at the level of 5.9 mJ/cm[2] (slightly above the STE threshold) and repetition frequency equal to 10 Hz. After 12 000 laser pulses we have not observed any STE signal decrease, what evidenced high temporal stability of obtained material. TACP crystals provide light scattering and any optical damage, changing their size and structure, must lead to the changes of scattering conditions According to this mechanism the increase of light intensity might be seen as a consequence of establishing more favorable light scattering conditions, supporting random feedback, while decrease of signals is strictly linked to the photo-degradation processes. Both scenarios are our speculations and requires further, more sophisticated and strictly oriented towards those phenomena studies, which are out of scope of the present article
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