Long-lived NIR emission in sulfur-doped zeolites due to the presence of [S3]2- clusters

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Abstract

The exploration of novel long-lived near-infrared (NIR) luminescent materials has attracted significant attention due to their applications in optical communications, anticounterfeiting, and bioimaging. However, these materials usually present low photoluminescence quantum yields and low photo- and chemical stability. Novel emitters that overcome these limitations are in demand. In this study, NIR emission was achieved using widely available, sustainable, and non-toxic materials through the synthesis of sulfur-doped zeolites, with different S/Cl ratios. With a combination of computational calculations (TD-DFT) and spectroscopic data, this emission was assigned to the radiative decay of excited triplet states of [S3]2- clusters, which resulted in a remarkably high Stokes shift (1.97 eV, 440 nm) and an average decay time of 0.54 ms. These new materials present high stability, external quantum efficiency of up to 17%, and a long-lived NIR emission, placing these compounds in a unique position to be used in applications demanding NIR emitters.

Original languageEnglish
Article number101514
Number of pages9
JournalMaterials Today Chemistry
Volume30
DOIs
Publication statusPublished - Jun 2023

Keywords

  • Chalcogen-doped zeolites
  • Luminescent materials
  • Near-infrared luminescence
  • Optical spectroscopy
  • Time-resolved spectroscopy

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