Polarized emission from perovskite nanocrystals

Polarization is a fundamental property of light and polarized light, including linearly polarized light, circularly polarized light and elliptically polarized light, plays a very important role in optoelectronic devices and systems, such as liquid crystal display (LCD), labeled biological systems, optical quantum computers, 3D display system, polarization photodetection, etc. Halide perovskites nanocrystals (PNCs), in terms of perovskite quantum dots, nanowires, nanorods, or nanoplates, have been found to demonstrate linearly and circularly polarized luminescence. This chapter provides an overview of the polarized emission mechanism of PNCs and linearly polarized luminescence of PNCs, including several techniques have been developed to align anisotropic PNCs into ordered patterns, for example, electrospinning, mechanical stretching, template assisted growth, solution-phase growth and chemical vapor deposition growth. Finally, the circularly polarized luminescence of PNCs and its potential applications also have been introduced.