Metal halide perovskites (MHPs) are exceptional semiconductors
best known for their intriguing properties, such as high absorption
coefficients, tunable bandgaps, excellent charge transport, and high
luminescence yields. Among various MHPs, all-inorganic perovskites
exhibit benefits over hybrid compositions. Notably, critical properties,
including chemical and structural stability, could be improved by
employing organic-cation-free MHPs in optoelectronic devices such
as solar cells and light-emitting devices (LEDs). Due to their enticing
features, including spectral tunability over the entire visible spectrum
with high color purity, all-inorganic perovskites have become a focus
of intense research for LEDs. This Review explores and discusses the
application of all-inorganic CsPbX3nanocrystals (NCs)
in developing blue and white LEDs. We discuss the challenges perovskite-based
LEDs (PLEDs) face and the potential strategies adopted to establish
state-of-the-art synthetic routes to obtain rational control over
dimensions and shape symmetry without compromising the optoelectronic
properties. Finally, we emphasize the significance of matching the
driving currents of different LED chips and balancing the aging and
temperature of individual chips to realize efficient, uniform, and
stable white electroluminescence.