Two-Dimensional Hybrid Perovskitoid Micro/nanosheets: Colorful Ultralong Phosphorescence, Delayed Fluorescence, and Anisotropic Optical Waveguide

Abstract

Molecular persistent luminescence, such as room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF), have attracted broad attention in the fields of biological imaging, information security, and optoelectronic devices. However, the development of molecular micro/nanostructures combining both RTP and TADF properties is still in an early stage. Herein, a new type of organic metal hybrid perovskitoid (OMHP) two-dimensional (2D) microcrystal has been fabricated through a facile solution method. The long-lived TADF–RTP dual emission can be highly tuned by changing the excitation wavelength, temperature, and decayed time. Moreover, the 2D OMHP microsheet exhibits an asymmetric and anisotropic optical waveguide with low optical loss coefficient, together with extremely high linearly polarized fluorescence–phosphorescence emission (anisotropy = 0.96), which is promising for the development of polarization-sensitive luminescent materials. Therefore, this work not only demonstrates new OMHP showing colorful persistent luminescence under different modes (such as excitation wavelength, temperature, polarization, lifetime, and dimension) but also takes advantage of the 2D micro/nanostructure to provide potential applications as optical logic gates and for delicate multiple information encryption.

Recent advances in ultralong room-temperature phosphorescence materials based on metal–organic halides

“…6). 44 In 2022, Cui's group constructed a series of edge-sharing 1D MOHs, which are named as (2-PI)PbBr 3 , (2-MBI)PbBr 3 and (5-MBI)PbBr 3 (2-MBI = 2-methylbenzimidazole, 5-MBI = 5-methylbenzimidazole, 2-PI = 2-phenylimidazole). However, only (5-MBI)PbBr 3 shows an efficient RTP that is attributed to the enhanced ISC and DET from [PbBr 3 ] À N .…”

“…By introducing Sb 3+ -based STE yellow emission, white emission could be achieved. 44 Copyright 2022, American Chemical Society.…”

Diphenylamine substituted 5,6,12,13-tetraazaperopyrene based polymorphic microcrystals versatile in multi-directional isotropic and anisotropic photon transport

“…[29][30][31][32][33][34][35] Apart from the polymorphic control of multimodal and low loss optical waveguides, 2D crystals capable of anisotropic propagation of photons, with multiple channels showing different polarization and emission properties, are also in high demand due to their considerable potential in optical planar diodes, logic devices, etc. 2,[36][37][38][39][40][41][42] Although it has been recognized that the fabrication of 2D organic crystals with anisotropic features is pertinent to the molecular-packing modes with controlled transition dipole of molecules in crystals, most reported 2D organic crystals exhibited isotropic photon propagation behaviors. 43,44 In this regard, the development of versatile photonic fluorophores with packing modes and transition dipoles suitable for polymorphic micro/nano-crystals and anisotropic 2D photon transport is of great significance, whereby fine-tuning the intermolecular interactions is crucial, yet remains challenging.…”

Ultralong Room‐Temperature Phosphorescence from Organic–Inorganic Hybrid Perovskitoid Based on Metal‐Organic Complex Component

“…[6,7] Meanwhile, exploring the luminescence contributions of organic cations starts to gain attention in perovskites or perovskitoids to expand their applications as multifunctional luminescent materials. As the molecular packing of organic cations could be significantly changed upon the interactions with inorganic scaffolds, it is possible to tune organic cation-based luminescence.Inspired by the fact that room-temperature phosphorescence (RTP) with long persistent luminescence (LPL) emission in organic molecules is attracting intensive interests in the fields of chemical sensors, bioimaging and anticounterfeiting technology, [8][9][10][11] assembling RTP organic moiety and infinite inorganic constituent into one integration might be an effective way to design highperformance multifunctional RTP materials. Optical inert metal halide clusters as nonemissive inorganic units can provide a rigid structure environment and introduce the heavy-atom effect, enhancing the LPL emissions in 0D halides.…”

“…Inspired by the fact that room-temperature phosphorescence (RTP) with long persistent luminescence (LPL) emission in organic molecules is attracting intensive interests in the fields of chemical sensors, bioimaging and anticounterfeiting technology, [8][9][10][11] assembling RTP organic moiety and infinite inorganic constituent into one integration might be an effective way to design highperformance multifunctional RTP materials. Optical inert metal halide clusters as nonemissive inorganic units can provide a rigid structure environment and introduce the heavy-atom effect, enhancing the LPL emissions in 0D halides.…”