Polarized emission from CsPbBr₃ nanowire embedded-electrospun PU fibers

Abstract

The interest in all-inorganic halide perovskites has been increasing dramatically due to their high quantum yield, band gap tunability, and ease of fabrication in compositional and geometric diversity. In this study, we synthesized µm long and ~4 nm thick CsPbBr3 nanowires (NWs). They were, then, integrated into electrospun polyurethane (PU) fibers to examine polarization behavior of the composite fiber assembly. Aligned electrospun fibers containing CsPbBr3 nanowires show remarkable increase in degree of polarization from 0.17 to 0.30. This combination of NWs and PU fibers provides a promising composite material for various applications such as optoelectronic devices and solar cells.

A Review on Halide Perovskites as Color Conversion Layers in White Light Emitting Diode Applications

“…Apart from their use in PV devices, they show more than 90% quantum yield in photoluminescence; moreover, they possess unique properties, such as solution‐processability, long carrier lifetimes, ease of fabrication, and wavelength tunability . These features make halide perovskites a strong candidate to be used in optical applications, including display technologies, WLEDs, and others . Particularly in the case of WLED applications, these halide perovskites may i) be used together with YAG phosphor; ii) replace YAG phosphor in YAG‐based WLEDs; or iii) be used to obtain three main red‐green‐blue (RGB) colors separately over UV LED, as alternative to UV phosphors.…”

Giant Optical Anisotropy of Perovskite Nanowire Array Films

“…Table 1 summarizes the reports using perovskite for polarized emission. Although high DOLP ≈0.7 was reported based on an individual perovskite NW,20 the DOLP for a cluster of unordered NWs are still lower than 0.5,21,40 demonstrating the importance of structural alignment for polarization applications. Gao et al have reported an orientationally grown of CsPbBr 3 NW arrays on muscovite mica using chemical vapor deposition (CVD), which possesses the capability to achieve high DOLP of 0.78 41.…”

“…However, the anisotropy polarization will be dramatically reduced for NW clusters due to random distribution and disordered arrangement of NWs, which is not practical for the scalable light emission application. As a proof of concept, Güner et al encapsulated CsPbBr 3 NWs into electrospun polyurethane (PU) fibers, but the emitted light from the specimen only showed a DOLP of 0.3 21…”

“…As a proof of concept, Güner et al encapsulated CsPbBr 3 NWs into electrospun polyurethane (PU) fibers, but the emitted light from the specimen only showed a DOLP of 0.3. [21] Generally, to realize highly polarized emission, NWs need to be aligned in ordered arrangement. [22] Electrospinning, mechanical rubbing, anisotropic etching, and lithography patterning are commonly used methods to fabricate well aligned nanostructures.…”

Silver nanoparticles enhanced luminescence and stability of CsPbBr3 perovskite quantum dots in borosilicate glass

“…Therefore, CsPbX 3 quantum dots have great application potential in quantum dot lasers, photodetectors, light-emitting diodes (LEDs), and solar cells. [1][2][3][4][5][6][7][8][9] There have been many routes to prepare this type of semiconductor material, including thermal injection, 10 ligand-assisted supersaturation recrystallization, 11 a microwave-assisted method, 12 and an ion exchange method. 13 Although perovskite quantum dots possess excellent optical properties, their poor stability limits their practical application.…”