Solution-based optical amplification, compared to solid-state thin-filmed based optical amplification, affords a plethora of benefits ranging from versatility in gain medium dimensions to stability afforded by improved heat dissipation. Works reporting solution-based optical amplification, however, remain sparse due to the difficulty in achieving high volume fractions required for optical amplification in liquid mediums. In this work, we demonstrate highly stable amplified spontaneous emission (ASE) from a solution of green-emitting CsPbBr<sub>3</sub> perovskite nanocrystals dispersed in a non-polar solvent after a facile post-synthesis process. This process not only allows for the purification of nanocrystals, but also retains the surface ligand density required for high volume fractions. Photostability tests also show sustained ASE intensities in excess of three hours under high, continuous photoexcitation of femtosecond pulsed laser beam far exceeding those of thin films by an order of magnitude. This work demonstrates for the first time green liquid ASE through CsPbBr<sub>3</sub> nanocrystals that is both versatile in containment and in applications which could aid in the development of dynamically tunable full-visible spectrum optical amplification for fluidic optical sensors and stable white ASE.

Solution-based green amplified spontaneous emission from colloidal perovskite nanocrystals exhibiting high stability

2019 Spring National Meeting

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.