Two‐Step Oxidation Synthesis of Sulfur with a Red Aggregation‐Induced Emission. (29th January 2020)

• Record Type: Journal Article
• Authors: Wang, Zhenguang; Zhang, Chuanchuan; Wang, Henggang; Xiong, Yuan; Yang, Xinjian; Shi, Yu‐e; Rogach, Andrey L.
• Is Part Of: Angewandte Chemie. Volume 132:Number 25(2020)
• Page Start: 10083
• Page End: 10088
• Publication Date: 2020-01-29
• Subjects: Aggregations-induzierte Emission -- Elementarer Schwefel -- Oxidation -- Phosphoreszenz -- Sauerstoffleerstellen; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201915511
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Sulfur is not normally considered a light‐emitting material, even though there have been reports of a dim luminescence of this compound in the blue‐to‐green spectral region. Now, it is shown how to make red‐emissive sulfur by a two‐step oxidation approach using elemental sulfur and Na2 S as starting materials, with a high photoluminescence quantum yield of 7.2 %. Polysulfide is formed first and is partially transformed into Na2 S2 O3 in the first step, and then turns back to elemental S in the second step. The elevated temperature and relatively oxygen‐deficient environment during the second step transforms Na2 S2 O3 into Na2 SO3 incorporated with oxygen vacancies, thus resulting in the formation of a solid‐state powder consisting of elemental S embedded in Na2 SO3 . It shows aggregation‐induced emission properties, attributed to the influence of oxygen vacancies on the emission dynamics of sulfur by providing additional lower energy states that facilitate the radiative relaxation of excitons. Abstract : Schwefel errötet : Rot emittierender Schwefel wurde durch eine zweistufige Oxidationsstrategie unter Verwendung von elementarem Schwefel und Na2 S als Startmaterialien synthetisiert. Er zeigt Aggregations‐induzierte Emissionseigenschaften infolge der Gegenwart von Sauerstoffleerstellen, die zusätzliche Energiezustände in der roten Spektralregion zur Verfügung stellen.