CsPbX₃ (X = Cl, Br, and I) Nanocrystals in Substrates toward Stable Photoluminescence: Nanoarchitectonics, Properties, and Applications

Abstract

Cesium lead halide (CsPbX 3 , X = Cl, Br, and I) perovskite nanocrystals (NCs) possess great potential in light-emitting diode applications because of their high brightness, low cost, tunable luminescence, and facile synthesis nature. However, these NCs are often disadvantaged by their instability in nonsolvent environment that hinders the practical applications of the material. In order to solve these issues, cesium lead halide NCs prepared using a solvent environment can be placed on substrates to retain the high stability and expand the applicability of the material. This Review focuses on the transfer of the allinorganic cesium lead halide NCs (synthesized in solutions) onto matrix materials and their direct synthesis on these bases, including the inert shell growth (inorganic and organic shell), embedment in matrixes (e.g., metal organic frameworks, porous SiO 2 , glass, ZrO 2 , Al 2 O 3 , and AlOOH), and direct synthesis in substrates. In particular, the strategies for stability and PL property improvement of the materials are also summarized. The purpose of this Review is to provide inspiration for the encapsulation of cesium lead halide NCs with high brightness and stability in matrixes to expand the applicability of these materials in wide color gamut backlighting (e.g., white-light-emitting devices).

Controlled Growth of Large SiO2 Shells onto Semiconductor Colloidal Nanocrystals: A Pathway Toward Photonic Integration

“…A notable example of light-control integration through SiO 2 shells is the work from Ji et al., where the authors were able to fabricate a plasmon microcavity directly onto a NC and enhance the emission rate . Another example is the exploitation of SiO 2 shells to increase the size of CdSe/CdS core–shell NCs for the fabrication of single-photon emitting arrays. , Recently, SiO 2 or similar inorganic matrixes were also exploited for the shelling of CsPbX 3 (X = Cl, Br, and I) NCs. Yet, in most cases, the SiO 2 shell thickness is relatively small or presents a high size dispersion.…”

“… 4 Another example is the exploitation of SiO 2 shells to increase the size of CdSe/CdS core–shell NCs for the fabrication of single-photon emitting arrays. 14 , 15 Recently, SiO 2 16 or similar inorganic matrixes 17 were also exploited for the shelling of CsPbX 3 (X = Cl, Br, and I) NCs. Yet, in most cases, the SiO 2 shell thickness is relatively small or presents a high size dispersion.…”

‘Out of the glovebox’ studies of a multifunctional [Gd3+‐Ho3+‐Dy3+]:CsPbI2.7Br0.3 perovskite semiconductor system for energy applications

“…14 Cs-based energy-efficient perovskite materials are characterized by impressively magnanimous absorption coefficients for photonic light and extended mobility of charge carriers. 15 Furthermore, they are also highly regarded in different applications and systems due to their commendably extended diffusion lengths, and they are also flexible towards engineering using different strategies for band gap energy tunability. 16,17 Such features offered by Cs perovskites have been actively employed in the fabrication of various devices.…”

Achieving a near-unity photoluminescence quantum yield and high stability of CsPbI3 nanoplatelets by hydroiodic acid-assisted ligand treatment

“…[27][28][29][30] Specifically, due to the low thickness and small width of CsPbI 3 NPLs, the area of the two planes is minimal, resulting in almost no ligand encapsulation. [31][32][33] Consequently, these CsPbI 3 NPLs tend to form nanowires through side-by-side fusion, typically found in δ-CsPbI 3 non-perovskite regions. [34][35][36][37] Current efforts to suppress perovskite QD fusion primarily focus on surface chemical improvements, including passivation of halogen defects or connecting strong ligands.…”