Phase Sensitivity of All-Inorganic Lead Halide Perovskite Nanocrystals

Abstract

Since the emergence of perovskite nanocrystal materials, they have captured the attention of the scientific world. Outstanding optoelectronic properties make them ideal materials for light-emitting and harvesting applications. Despite these advantages, they suffer from serious phase instability and remain highly sensitive to the external parameters. These parameters are not random and can be well correlated with the nature of materials. In many cases, the phase sensitivity can be used for different applications. Hence, understanding the chemistry behind this transformation is important to understand their synthesis, processing, and device fabrication. Considering its importance, this most critical issue of the phase sensitivity of perovskite nanocrystals is elaborated and correlated with their synthesis, purification, and harvesting. This Review provides state-of-the-art views on their current developments and future prospects.

Perovskite Smart Windows: The Light Manipulator in Energy‐Efficient Buildings

“…It has been reported that CsPbBr 3 , comprising solely of bromide ions, can undergo water‐mediated phase transformations to yield CsPb 2 Br 5 by stripping of CsBr salt. [ 81 ] Such a transformation is normally accompanied by the change of the photoluminescence. Yu et al reported on a novel reversible thermochromic luminescent CsPbBr 3 nanocrystal to realize emissive control.…”

Enhancing Photoluminescence and Stability of Mn-Doped Cs2InCl5·H2O Microcrystals with Introduced Bi3+ Ion

“…All-inorganic lead halide perovskites have attracted substantial attention due to their unique properties and potential applications. − However, their toxicity (with Pb) and instability under ambient conditions limit their applications and have generated strong interest in developing nontoxic and stable alternatives. − Low-dimensional lead-free luminescent metal halides with a unique soft lattice have aroused reviving interest due to their outstanding optical properties including a large absorption coefficient, high photoluminescence quantum yield (PLQY), broad emission band, and large Stokes shift. − These advantages make them ideal candidates as a new class of luminescent materials and as an alternative to lead halide perovskites. Among these, zero-dimensional (0D) In-based metal halides, such as A 3 InX 6 (A = Cs and Rb), , have become the focus of attention owing to their spatially and electronically decoupled 0D structure that favors strongly localized excitonic states. − Specifically, through the control of the A cation and the octahedral unit, highly efficient and largely Stokes-shifted visible luminescence, stemming from self-trapped exciton (STE) states, was achieved in 5s 2 metal Sb 3+ - or Te 4+ -doped 0D In-based halide crystals.…”

Ultrasmall water-stable CsPbBr3 quantum dots with high intensity blue emission enabled by zeolite confinement engineering

“…The all-inorganic CsPbX 3 (X = Cl, Br or I) PQDs offer promising photoelectric characteristics as opposed to the organic-inorganic hybrid perovskite, such as better optical and thermal stability and suitable bandgap. [6][7][8][9][10] By now, all-inorganic PQDs with stable green and red fluorescence emission have achieved a PLQY of nearly 100%, [11][12][13][14][15] but the blue light efficiency remains to be improved due to the uncontrollable phase fusion and difficult size adjustment. 16 Cl-Br mixed perovskites, which are easily produced by using halide substitution to create blue perovskite emitters, are susceptible to halide segregation under an electric field, which causes spectral shifting.…”