Light‐Emitting Metal–Organic Halide 1D and 2D Structures: Near‐Unity Quantum Efficiency, Low‐Loss Optical Waveguide and Highly Polarized Emission
Feng Liu, Tongjin Zhang, Debayan Mondal, Shiyong Teng, Ying Zhang, Keke Huang, Dayang Wang, Wensheng Yang, Priya Mahadevan, Yong Sheng Zhao, Renguo Xie, Narayan Pradhan
Abstract
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 ) 2− 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 single‐crystal 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 self‐trapping excitons. Spatially resolved PL spectra confirm that these microrods exhibit an optical waveguide effect with a low loss coefficient (0.0019 dB μm −1 ) during propagation, and linear polarized photoemission with a polarization contrast (0.57).