Abstract
This paper reports a temperature-tunable conjugated polymer poly[3-(2-ethyl-isocyanato-octadecanyl)-thiophene] (TCP) laser working in superradiant (SR)—or amplified spontaneous emission (ASE)—mode. The absorption spectra indicated the aggregate (mostly dimer) formation upon increasing concentration and/or decreasing temperature. Amplified spontaneous emission (ASE) was observed at suitable concentration, temperature, and pump energy values. The efficiency of the ASE from the TCP polymer was improved by energy transfer from an oligomer 9,9,9′,9′,9″,9″-hexakis(octyl)-2,7′,2′,7″-trifluorene (HOTF). Moreover, the ASE wavelength can be tuned between 550 and 610 nm by changing the temperature of the solution from 60 to 10 °C. To the best of our knowledge, this is the first report of a high-power, temperature-tunable, and conjugated polymer laser.
Highlights
The emission wavelength of a laser is critical in determining its applications
We present a high-power and temperature-tunable laser based on the conjugated poly[3-(2-ethyl-isocyanato-octadecanyl)-thiophene] (TCP) polymer
We studied the behavior of MEH-PPV in benzene at a concentration of 0.5 μM and it was clear that quantum yield decreased with temperature
Summary
Tunable lasers are necessary for numerous applications and researches, especially in the medical, engineering, and physical sciences and in various other fields. Tunability avoids the need for different lasers for different applications. Only a few optically pumped tunable lasers, such as Ti:sapphire and Cr:Forsterite, have been developed. These solid-state lasers are very expensive and delicate to handle, and have limited tunability. Dye lasers based on rhodamines and coumarin derivatives are cheaper and have excellent tunability, suffer from poor photochemical stability. On the other hand, Conjugated polymers are new types of laser materials with higher photochemical stability than conventional dye solutions. Optically pumped and tunable lasers based on conjugated polymers in solution represent interesting alternatives to dye lasers
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