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

ABSTRACT 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 (CsPbBr 3 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 . Time‐resolved photoluminescence (PL) reveals a Purcell factor of , 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.