Room-temperature lasing from fluorene thin-film crystals densely doped with anthracene

Abstract

The potential for room-temperature lasing in densely doped organic crystals has been examined using (fluorene)0.8-(anthracene)0.2 thin crystals fabricated in a narrow gap between two quartz plates. An excitation-intensity dependence study confirms that the system shows spectral line narrowing, a super linear increase of the narrow line above threshold excitation intensity, and laser cavity modes. These results indicate that lasing has been observed in the densely doped organic crystal, which contains in-plane cavities with a length of approximately 100 μm.

Organic Single Crystal Lasers: A Materials View

“…As demonstrated for doped nanocrystals of DSB, often molar doping ratios of 10 −3 are sufficient to induce transfer efficiencies of 90% and more, due to efficient thermally activated exciton diffusion in the crystals, allowing effective tuning of the emission color over a large spectral range with fluorescence quantum yields up to unity . For lasing applications, usually higher doping ratios (some%) are used, where current efforts concentrate on anthracene, and unsubstituted oligophenylenevinylenes as host crystals . Recently, molecules showing thermally activated delayed fluorescence (TADF) were used as host materials, which are able to effectively harvest triplets.…”