Intense Broadband Emission in Layered Perovskites
Dec. 27, 2019
Broadband emission in Ruddlesden-Popper lead iodide perovskites (PEA2MAn-1PbnI3n+1) can be induced through cation impurity atom doping and/or alloying.
We investigate and understand the origin of Sn-alloying induced broadband emission in layered lead iodide perovskites and the impact of inorganic layer thickness on emission properties
Significance and Impact
This work demonstrates key factors that impact the emission properties of layered hybrid perovskites, advancing their potential for light-emitting applications.
- Crystals of different Sn% and inorganic layer thickness (n=1, 2 and 3) were characterized.
- Carrier dynamics of Sn-alloyed layered 2D perovskites were studied using transient reflectance spectroscopy.
- Density-functional theory (DFT) calculation revealed that the nature of the broad emission is due to self-trapped exciton formation.
- Sensitivity of broad emission from trace Sn can also impact targeted "Sn-free" sample properties.