We are excited to announce that 2D-PRINTABLE has reached a major milestone: the realization of fully printed, all-nanosheet light-emitting diodes (LEDs) targeting an external quantum efficiency (EQE) exceeding 10%.
Multi-layer heterostructures, composed entirely of solution-processed 2D nanosheets – including p-type Nb-doped WSe₂, n-type MoS₂, and luminescent WS₂, were successfully assembled using liquid-liquid interface assembly, spin-coating, and spray-coating techniques. Transparent MXene electrodes and printed silver nanoplatelets enabled vertical diode structures entirely made from printable nanosheet films. This marks the first demonstration that complex diode-type heterostacks can be fabricated entirely from 2D-material inks.
The project has confirmed the electroluminescence capability of the nanosheet materials, demonstrated the feasibility of producing all-printed, all-nanosheet heterostructure LEDs, and identified the technical challenges that must be addressed to surpass an EQE of 10%. This achievement provides a solid experimental foundation for subsequent optimization steps and positions the project on a clear path toward reaching its performance targets.
More details can be found in our deliverable “All-printed, All-Nanosheet Diode-Type Devices” here.
Congratulations to the entire consortium on this outstanding achievement!
The figure above presents All printed, all-2D heterostack device structure (A) and current density J and irradiance E versus voltage V of a device based on electrochemically exfoliated MoS2 nanosheets and a conventional diode structure. The inset is the electroluminescence spectrum of the device operated at 10 V.
