Light Emission & Localization Mechanisms in Halide Perovskites – Composition, Doping, Dimensionality

Halide perovskites are fascinating semiconductors for light-emitting applications. Compared to conventional inorganic covalent semiconductors like silicon or GaAs, perovskites are structurally soft and often more disordered. Understanding the consequences of this remains a key challenge for commercialization but offers also opportunities for tailoring properties to target applications.

Here I will present our recent mechanistic insights from spectroscopy on the role of composition, doping and dimensionality to control light emission through localization effects in low-dimensional halide perovskite emitters.

I will present the intriguing photophysics of a new 2D germanium perovskites, with properties in some respects even outshining their lead analogues, and then will introduce a new synthesis route to ambient doping of 0D nanocrystals in the strong confinement regime, giving for the first time access to strongly confined, yet transition-metal doped perovskite nanocrystals, with profound consequences for the light-emitting properties of the resulting materials. Overall I will highlight the promise these solution-processable materials hold for low-cost optoelectronic technologies with custom-tailored properties.