Colloidal Silicon Quantum Dot-Based Cavity Light-Emitting Diodes with Narrowed and Tunable Electroluminescence

Luminescent colloidal silicon quantum dots (SiQDs) are explored as alternatives to metal-based quantum dots for light-emitting diodes (LEDs) because of the abundance and biocompatibility of silicon. To date, the broad electroluminescence (EL) bandwidth (>100 nm) and blueshifting of EL at high applied voltages of SiQD-LEDs are outstanding challenges that limit a competitive spectral purity and device stability. Herein, the fabrication and testing of SiQD-LEDs that incorporate a Fabry–Pérot cavity are reported which exhibit a narrow spectral linewidth as low as ≈23 nm. The presented devices also provide wavelength and visual stability from +4 to +8 V, as well as spectral tunability.