Blue-Light-Excitable Red-to-Near Infrared Photoluminescence in 0D Antimony(III) Bromide Hybrids for Supplemental Lighting

摘要

Antimony (III)-containing halide hybrids possess a distinctive stereoactivity with a 5s2 lone pair, which further induces significant structural distortions upon light excitation. Herein disordered dis-[TPPen]2SbBr5 (TPPen = triphenylpentylphosphonium) and ordered ord-[TPPen]2SbBr5, have been synthesized and exhibit self-trapped excitons (STEs) emissions in the red-to-near infrared (NIR) range. Benefiting from a high distortion degree of STEs confined within the [SbBr5]2- unit and the pronounced alterations in the SbBr bond lengths upon blue-light excitation, dis-[TPPen]2SbBr5 achieves a greater level of excited state distortion and a larger Stokes shift than those of ord-[TPPen]2SbBr5. The fabrication of blue light excited NIR light-emitting device based on dis-[TPPen]2SbBr5 demonstrates the prospective application in night vision supplemental lighting and non-destructive examination. This work provides valuable molecular design strategies for the NIR luminescent materials in hybrid metal halides. @@@ The red-to-near infrared photoluminescence is reported in 0D antimony(III) bromide hybrids. Benefiting from a high distortion degree of self-trapped excitons confined within the [SbBr5]2- unit and the pronounced alterations in the SbBr bond lengths upon blue-light excitation, disordered dis-[TPPen]2SbBr5 achieves a greater level of excited state distortion and a larger Stokes shift than those of ordered ord-[TPPen]2SbBr5. image

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