Room-Temperature Electrically Driven Tamm-Plasmon Exciton-Polariton LEDs Incorporating Monolayer Perovskite Quantum Dots

Electrically driven exciton-polaritons in halide perovskites present a viable route toward room-temperature coherent light sources and polaritonic circuitry, yet experimental realizations remain limited. Here, we demonstrate a room-temperature, electrically driven exciton-polariton light-emitting diode (LED) by embedding a single monolayer of all-inorganic perovskite quantum dots (CsPbBr₃ QDs) into a Tamm-plasmon (TP) microcavity comprising a distributed Bragg reflector (DBR) and a silver mirror. The subwavelength QD monolayer simultaneously provides strong exciton oscillator strength and reduces optical mode volume, yielding a large Rabi splitting of (Formula presented.). Time-resolved photoluminescence (PL) reveals a Purcell factor of (Formula presented.), evidencing accelerated radiative recombination and strengthened light-matter coupling. Under optical excitation, an accumulation of polariton population near the lower polariton branch minimum is observed, whereas momentum-resolved electroluminescence (EL) reveals a persistent polariton bottleneck effect under electrical injection. These results establish a scalable, fabrication-compatible platform for electrically driven polaritonic light sources at room temperature, advancing the development of integrated quantum photonic and optoelectronic technologies.