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Published on: April 14, 2020
Sb3+-Activated Near-Infrared Circularly Polarized Luminescence in Chiral Zero-Dimensional Hybrid Tin(IV) Chlorides
Liumei Qin1,2, Dongmei Wu1, Xia Deng3
1School of Chemistry and Chemical Engineering, Key Laboratory of Electrochemical Energy Materials, State Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite Structures, Guangxi University, Nanning, Guangxi530004, China.
Abstract:
Near-infrared circularly polarized luminescence (NIR-CPL) materials are promising for advanced photonic applications, yet simultaneously achieving pronounced chiroptical activity and efficient NIR emission remains challenging. Herein, we report a pair of enantiomeric zero-dimensional chiral tin(IV) chlorides, (R/S-APD)SnCl6 (R/S-APD: R/S-3-aminopiperidine), and activate broadband visible-to-NIR CPL through heterovalent Sb3+ incorporation. The chiral host lattice transfers molecular chirality to isolated [SnCl6]2- units through asymmetric N-H···Cl hydrogen bonding. Sb3+ doping introduces low-symmetry Sb-centered emissive centers, enabling ultrabroad 500-1000 nm emission. The R and S enantiomers exhibit mirror-image CPL with luminescence dissymmetry factor (glum) values of -2.6 × 10-3 and +3.3 × 10-3, respectively. Temperature-dependent photoluminescence reveals strong electron-phonon coupling and a high exciton binding energy, supporting robust self-trapped exciton emission. The material exhibits excellent stability, retaining 79% of its emission intensity after 120 days. This work establishes a host-dopant strategy that decouples chirality transmission from emissive-state engineering, providing a pathway toward stable chiral halide emitters for NIR photonics and imaging applications.
![The Synthesis of [Sn10(Si(SiMe3)3)4]2- Using a Metastable Sn(I) Halide Solution Synthesized via a Co-condensation Technique](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F54498.jpg&w=3840&q=50)
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