Proceedings of Online nanoGe Fall Meeting 20 (OnlineNFM20)
Publication date: 4th October 2020
Solution processed lasers typically based on organic or nanocrystal active media, have emerged as versatile, high performing light sources for a variety of low-cost applications. Among the various resonator-gain media combinations, vertical cavity surface emitting lasers (VCSELs) based on lead halide perovskite nanocrystals (LHP NCs) appear particular attractive as they combine the impressive optical amplification properties of the LHP NCs with facile fabrication of relatively high Q-factor microcavities (MCs) suitable for low threshold lasing with stable intensity and small beam divergence. Yet, there are currently limited reports on such systems in the literature.
Herein, we demonstrate the fabrication of monolithic, all-solution processed MCs based on green emitting CsPbBr3 NCs and polymeric distributed Bragg reflectors (DBRs) produced out of alternate layers of cellulose acetate (CA) and polyvinylcarbazole (PVK) materials. Steady state and time-resolved photoluminescence (PL) experiments along with angle dependent reflectivity and PL are implemented for the characterization of the MCs. The photonic structures exhibit impressive Q-factors up to ~ 300 that compete against the state-of-the-art of polymer-based resonators allowing the generation of bright green superluminescence under continuous wave excitation. The onset of amplified spontaneous emission is evidenced by the: (i) threshold-type behavior and spectral narrowing on the excitation variable PL, (ii) quenching of the PL lifetime when the cavity resonance overlaps with the emission of NCs. The aforementioned results, demonstrate the high potential of LHP NC photonic structures for practical, scalable, low cost laser applications.
This work was financially supported by the Research and Innovation Foundation of Cyprus, under the "NEW STRATEGIC INFRASTRUCTURE UNITS-YOUNG SCIENTISTS" Program (Grant Agreement No. "INFRASTRUCTURES/1216/0004", Acronym "NANOSONICS"). M. Athanasiou acknowledges financial support by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 831690.
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