Water-Soluble TADF emitters for sensing and imaging applications

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

Publication . Viola, Catarina; Laia, César A. T.; Outis, Mani; Ferreira, Luís F. V.; Alves, Luís C.; Teixeira, Miguel; Folgosa, Filipe; Lima, João C.; Ruivo, Andreia; Avó, João; DQ - Departamento de Química; LAQV@REQUIMTE; VICARTE - Vidro e Cerâmica para as Artes; Instituto de Tecnologia Química e Biológica António Xavier (ITQB); Elsevier

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.

2023-06Artigo científico

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Fundação para a Ciência e a Tecnologia

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OE

Número da atribuição

SFRH/BPD/120599/2016