Perovskites have achieved immense progression in optoelectronic
device applications owing to their fascinating intrinsic properties.
However, the integration of perovskites in lighting applications has
been retarded due to the challenges involved in achieving their deep
blue light-emitting diodes (LEDs). Unlike other color counterparts,
obtaining a stable, defect-tolerant, and high-band gap perovskite
material for deep blue emission is an arduous task. Moreover, the
ambient stability and efficient charge injection in the device are
bottlenecks for the established perovskite emissive materials. Among
all the dimensional perovskite counterparts, quasi-two-dimensional
perovskites (Q2DPes) with hydrophobic ligands can exhibit better stability,
and also, facile tunability of the properties can overcome the associated
challenges. In this paper, for the first time, we demonstrate Ruddlesden–Popper-based
Q2DPes that are pure deep blue emissive in the 450 nm region, stable,
and can facilitate decent charge injection in LEDs. We have also demonstrated
systematic modulations in the properties of the material, concerning
the organic cation concentration.