In this paper we present a new concept to control the energy transfer between two components using novel multiphasic nanostructured composites. The example studied here consists of two lasing dyes amino)phenylstyryl]-N-(hydroxyethyl)pyridinium iodide (ASPI)), each of which resides in two different phases of a multiphasic composite. The energy transfer between these two phases was studied and found to be insignificant. Therefore, this composite exhibited lasing from both dyes. The multiphasic matrix was tunable through the range of both dyes from 560 to 610 nm with an efficiency of ∼7%. The lasing properties of this lasing media were studied compared to reference dye solutions. In the solution state a mixture dye solution exhibited complete quenching of one of the dyes (Rhodamine-6G). The quenching mechanism in the solution state and its lack in the solid state matrix is proposed. In addition, the new laser dye, ASPI, has been characterized by its linear spectroscopy and lasing properties in solution. The results of this characterization reveal a dye with a low fluorescence quantum yield (∼7 × 10 -3 ), but high lasing efficiency (∼13.5%) under pulsed pumping conditions. An intersystem crossing from the S 1 to T 1 state may be responsible for this phenomenon.

We present the preparation of novel multifunctional nanostructured composite materials using the sol-gel process. We have demonstrated the doping of two optical limiting organic molecules (Cso and bisbenzothiazole 3,4-didecyloxythiophene (BBTDOT)) in a single bulk while maintained the optical limiting effect at each of their characteristic wavelengths. A multiphasic composite glass doped with both Cso and BBTDOT exhibited effective optical power limiting at 532 and 800 nm due to independent limiting effects at each wavelength generated by each of the two dopants. These composite glasses have excellent optical quality (loss % 1 dB/m) and a large bulk size. By using our methodology, it is possible to dope two (or more) different optically responsive materials, each of which will reside in different phases of the matrix to make multifunctional nanostructured bulk materials for photonic applications.

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