Colloidal quantum dots (CQDs), as well as colloidal nanoplatelets (CNPLs), have attracted interest for light emission applications because of their high photoluminescence quantum yield, size-controlled wavelength tunability across the visible and infrared spectral spectral regimes, and convenient processing from the solution phase. However, their applications as color downconverters and gain media for photon amplifiers and lasers are hindered by non-radiative Auger recombination, a process that is accelerated in CQDs and CNPLs.

In our group, we have combined the efforts of synthetic chemists, theoretical physicists, and photonic engineers to investigate how to supress and avoid Auger recombination in high power phosphors and lasers. To achieve optical gain with the lowest feasible number of excitons, we have engineered improved modal confinement to CQD solids and improved exciton fine structure.

Selected Publications

Adachi, M. M. et al. Microsecond-sustained lasing from colloidal quantum dot solids. Nat. Commun. 6, 8694 (2015)

Fan, F. et al. Colloidal CdSe1–xSx Nanoplatelets with Narrow and Continuously-Tunable Electroluminescence. Nano Lett. 15, 4611-4615, (2015)