DOI: https://doi.org/10.29363/nanoge.emlem.2022.040
Publication date: 15th July 2022
Colloidal quantum dots (QDs) are attractive materials for realizing solution processable laser diodes that could benefit from the unique features of these zero-dimensional structures such as size-controlled emission wavelengths, low optical-gain thresholds, and ease of integration with photonic and electronic circuits. However, the implementation of such devices has been hampered by fast Auger recombination of gain-active multicarrier states, poor stability of QD films at high current densities, and the difficulties in obtaining net optical gain in a complex device stack wherein a thin electroluminescent QD layer is combined with optically lossy charge-transport layers. Here we resolve these challenges and achieve lasing regime in electrically pumped devices that employ compact, continuously graded QDs with strongly suppressed Auger recombination incorporated into a low-loss photonic waveguide integrated into a pulsed, high-current density light-emitting diode. These prototype colloidal QD laser diodes exhibit strong, broad-band optical gain and demonstrate low-threshold, room-temperature laser action at both the band-edge (637 nm) and the excited-state (586 nm) transitions.
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