Ultralow‐loss Optical Waveguides through Balancing Deep‐Blue TADF and Orange Room Temperature Phosphorescence in Hybrid Antimony Halide Microstructures

Abstract

Harnessing the potential of thermally activated delayed fluorescence (TADF) and room temperature phosphorescence (RTP) is crucial for developing light‐emitting diodes (LEDs), lasers, sensors, and many others. However, effective strategies in this domain are still relatively scarce. This study presents a new approach to achieving highly efficient deep‐blue TADF (with a PLQY of 25%) and low‐energy orange RTP (with a PLQY of 90%) through the fabrication of lead‐free hybrid halides. This new class of monomeric and dimeric 0D antimony halides can be facilely synthesized using a bottom‐up solution process, requiring only a few seconds to minutes, which offer exceptional stability and nontoxicity. By leveraging the highly adaptable molecular arrangement and crystal packing modes, the hybrid antimony halides demonstrate the ability to self‐assemble into regular 1D microrod and 2D microplate morphologies. This self‐assembly is facilitated by multiple non‐covalent interactions between the inorganic cores and organic shells. Notably, these microstructures exhibit outstanding polarized luminescence and function as low‐dimensional optical waveguides with remarkably low optical‐loss coefficients. Therefore, this work not only presents a pioneering demonstration of deep‐blue TADF in hybrid antimony halides, but also introduces 1D and 2D micro/nanostructures that hold promising potential for applications in white LEDs and low‐dimensional photonic systems.

Regulation and application of organic luminescence from low-dimensional organic–inorganic hybrid metal halides

“…are preferred to avoid strong SOC that enhances phosphorescence emission from T 1 to S 0 . [67][68][69] Yan's group has conducted representative research on LDMHs with TADF properties based on 4-hydroxypyridine, benzotriazole and tetraphenylphosphonium. 68,[70][71][72] Taking 4HP (4HP = 4-hydroxypyridine) as an example, Yan et al demonstrated a 2D blue light-emitting metal halide CdCl 2 -4HP with efficient TADF emission (Fig.…”

Molecular design towards efficient light-emitting copper(i) halide mononuclear hybrids

“…Due to the increasing demand for clean-energy lighting materials, copper halide-based organic–inorganic hybrid structures are a growing family of compounds that are gaining attention for their intriguing luminescent properties. 1–11 This diverse family of compounds warrants more research to better understand their structure–property correlations in order to design new structures with better performance. 12–15 A variety of inorganic building motifs have already been reported for copper halide-based structures, with the most common being a Cu 2 X 2 rhomboid dimer, a Cu 4 X 4 cubane tetramer, and a (CuX) ∞ staircase chain (Fig.…”

Water/Light Multiregulated Supramolecular Polypseudorotaxane Gel with Switchable Room-Temperature Phosphorescence

“…9,10 For example, Xiao et al constructed a new supramolecular hydrogel using 1,4-diaminobenzene (DB) and hexamethyl cucurbit [5]uril (HmeQ [5]) by the host−guest interaction, and then embedded 6-bromo-2-naphthol (BrNp) exhibited fluorescent−phosphorescence double emissions due to the rigid microstructure. 11 Multicolor luminescence, 12 especially multicolor RTP materials, 13 is a hot topic in the field of chemical materials. However, there are still some limitations in the regulation of the RTP emission.…”

“…Recently, supramolecular systems with room-temperature phosphorescence (RTP) have been considered as more advantageous luminescent materials due to the distinctive properties, such as large Stokes shift and long triplet lifetime. − The macrocyclic confinement effect and the reversibility of supramolecular systems have attracted increasing research efforts to effectively enhance RTP through noncovalent interactions. − The encapsulation of macrocyclic hosts could restrict molecular motion of phosphorescent guests and even promote intersystem crossing (ISC) to enhance RTP emission. , In addition, the abundant hydrogen bonding interactions and ordered spatial structure of supramolecular assemblies supply a rigid microenvironment, which is able to stabilize the triplet state and inhibit nonradiative transitions to promote RTP. , For example, Xiao et al constructed a new supramolecular hydrogel using 1,4-diaminobenzene (DB) and hexamethyl cucurbit[5]­uril (HmeQ[5]) by the host–guest interaction, and then embedded 6-bromo-2-naphthol (BrNp) exhibited fluorescent–phosphorescence double emissions due to the rigid microstructure . Multicolor luminescence, especially multicolor RTP materials, is a hot topic in the field of chemical materials. However, there are still some limitations in the regulation of the RTP emission.…”