The PULSE project aims at exploring novel temporal regimes in organic lasers. Organic and excitonic thin-film lasers are compact and low-cost sources that are able to emit over the entire visible spectrum and that are compatible with all existing platforms, including flexible or bio-substrates. They can address applications in bio or chemo-sensing, visible light communications or spectroscopy and are anticipated to play a major role in future all-organic or hybrid photonic integrated circuits. They are today however limited to the production of low-intensity nanosecond pulses at low repetition rates under optical pumping. The objective of this project is to head towards new temporal regimes that have never been demonstrated up to now, namely ultrashort pulses and high repetition rate laser action. The strategy consists in implementing recently-discovered materials in the field of organic optoelectronics and nanophotonics into innovative laser architectures. More specifically, two scientific bottlenecks will be targeted. The first one is the “triplet piling-up” problem, which has prevented any solid-state organic laser to operate in the continuous-wave (CW) regime until now. To tackle this issue, we will make good use of recently developed compounds that have shown laser operation in quasi-CW regime, as well as original molecular assemblies with a potential for selective triplet deactivation. The aim will be to obtain laser pulses long enough to ensure stable mode-locking operation. The second bottleneck is the lack of suitable saturable absorbers able to mode-lock solid-state organic lasers: while classical dye saturable absorbers are too slow, fast semiconductor saturable absorbers are not available in the visible part of the spectrum. We propose in this project to work on a new class of saturable absorbers whose properties are very well matched to organic emitters. The timely convergence between the availability of such saturable absorbers and the possibility of long-pulses with organic solid-state lasers make the perspective of demonstrating the first solid-state organic sub-ps laser perfectly realistic in the framework of the PULSE project.