Publication date: 18th August 2023
Conjugated polymer (CP) based microspheres of very high definition and outstanding photonic and luminescent properties have been prepared by a technique based on slow solvent-controlled diffusion into micelles formed by the surfactant cetyl(trimethyl)ammonium bromide (CTAB). Poly[(9,9-di-n-octylfluorenyl-2,7-diyl)-alt-(benzo[2,1,3]thiadiazol-4,8-diyl)] (F8BT) and mixtures of the latter with poly[2-methoxy-5-(2’-ethylhexyloxy)-1,4-phenylene vinylene (MEH-PPV) were used for this purpose. Spheres with diameters between 1 and 10 μm were obtained and structural characterization by AFM and SEM demonstrated good sphericity and low surface roughness. Correspondingly, spontaneous emission of the spheres exhibits whispering gallery resonances of high quality factor (Q > 1800). Upon pumping the microspheres with a pulsed Nd:YAG laser operating at 355 nm we obtained lasing at low threshold fluences (≈ 4 μJ/cm2) with instrumentally limited linewidths corresponding to Q > 18000. Lasing in microspheres composed of blends of both CPs, coupled by Förster resonant energy transfer (FRET), is observed at extremely low threshold fluences down to ≈ 0.5 μJ/cm2. These spherical structures are promising candidates in the search for low-threshold organic microlasers excited by light-emitting diodes or diode lasers or for ultrasensitive optical sensing.
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