Light‐Emitting Metal–Organic Halide 1D and 2D Structures: Near‐Unity Quantum Efficiency, Low‐Loss Optical Waveguide and Highly Polarized Emission

Abstract

Organic-inorganic metal-halide materials (OIMMs) with zero-dimensional (0D) structures offer useful optical properties with a wide range of applications. However, successful examples of 0D structural OIMMs with well-defined optical performance at the micro-/nanometer scale are limited. We prepared one-dimensional (1D) (DTA) 2 SbCl 5 •DTAC (DTAC = dodecyl trimethyl ammonium chloride) single-crystal microrods and 2D microplates with a 0D structure in which individual (SbCl 5 ) 2À quadrangular units are completely isolated and surrounded by the organic cation DTA + . The organic molecular unit with a long alkyl chain (C 12 ) and three methyl groups enables microrod and -plate formation. The singlecrystal microrods/-plates exhibit a broadband orange emission peak at 610 nm with a photoluminescence quantum yield (PLQY) of ca. 90 % and a large Stokes shift of 260 nm under photoexcitation. The broad emission originates from selftrapping excitons. Spatially resolved PL spectra confirm that these microrods exhibit an optical waveguide effect with a low loss coefficient (0.0019 dB mm À1 ) during propagation, and linear polarized photoemission with a polarization contrast (0.57).Organic-inorganic metal-halide materials (OIMMs), a bulk crystal with 0D structure at the molecular level, have attracted tremendous attentions due to their potential optoelectronic applications as light-emitting materials. [1] These materials though in bulk; but can have bright emission and also retain as high as near unity photoluminescence quantum yield (PLQY). [2] Among different applications these could also serve as a potential optical materials in micro-/ nanosized optical waveguides. [3] To date, research on optical

Self-trapped exciton emission and piezochromism in conventional 3D lead bromide perovskite nanocrystals under high pressure

“…2e-g), indicating that both emissions originated from STEs. 36,37 Typically, the presence of STEs was manifested through broadband luminescence. 38 Once electrons and holes are photogenerated, they are self-trapped rapidly to form STEs due to the strong electron-phonon coupling with an increase in pressure, which leads to the emission enhancement of STEs.…”

Self-Trapped Exciton Emission in a Zero-Dimensional (TMA)2SbCl5·DMF Single Crystal and Molecular Dynamics Simulation of Structural Stability

“…Organic–inorganic hybrid metal halide materials have attracted extensive attention as semiconductor materials with exceptional structure and adjustability of luminescent properties, including high absorption coefficient, high electron–phonon coupling coefficient, and high photoluminescence quantum yield (PLQY), which have a wide variety of optoelectronic applications, such as lasers, light-emitting diodes, thin-film transistors, etc. − Lead-based metal halide hybrids are usually used to understand luminescent materials with their high PLQY and tunable optical properties. − However, the lack of structural stability resisting long-term light, moisture, or high temperature and heavy metal lead toxicity to humans and the environment all limit its further real applications. − To overcome these problems, it is indispensable to obtain environmentally friendly stable organic–inorganic hybrid metal halide materials. Generally, using other inorganic materials instead of toxic lead materials and lowering the structural dimension can greatly reduce the toxicity and improve the stability, − respectively.…”

Origin of Luminescence in Sb3+- and Bi3+-Doped Cs2SnCl6 Perovskites: Excited State Relaxation and Spin–Orbit Coupling

“…Zero-dimensional perovskites such as Cs 2 SnCl 6 are more stable and environmentally benign, compared lead-halide perovskites. − But Cs 2 SnCl 6 does not show interesting optical or optoelectronic properties. To impart optical and optoelectronic functionality, ions such as Sb 3+ and Bi 3+ with 5s 2 and 6s 2 outermost electronic configuration, respectively, are doped into Cs 2 SnCl 6 .…”