Highly Emissive Self‐Trapped Excitons in Fully Inorganic Zero‐Dimensional Tin Halides. (30th July 2018)

• Record Type: Journal Article
• Authors: Benin, Bogdan M.; Dirin, Dmitry N.; Morad, Viktoriia; Wörle, Michael; Yakunin, Sergii; Rainò, Gabriele; Nazarenko, Olga; Fischer, Markus; Infante, Ivan; Kovalenko, Maksym V.
• Is Part Of: Angewandte Chemie. Volume 130:Number 35(2018)
• Page Start: 11499
• Page End: 11503
• Publication Date: 2018-07-30
• Subjects: Festphasensynthesen -- Lumineszenz -- Perowskite -- Selbstfangende Exzitonen -- Zinn; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201806452
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: The spatial localization of charge carriers to promote the formation of bound excitons and concomitantly enhance radiative recombination has long been a goal for luminescent semiconductors. Zero‐dimensional materials structurally impose carrier localization and result in the formation of localized Frenkel excitons. Now the fully inorganic, perovskite‐derived zero‐dimensional Sn II material Cs4 SnBr6 is presented that exhibits room‐temperature broad‐band photoluminescence centered at 540 nm with a quantum yield (QY) of 15±5 %. A series of analogous compositions following the general formula Cs4− x A x Sn(Br1− y I y )6 (A=Rb, K; x ≤1, y ≤1) can be prepared. The emission of these materials ranges from 500 nm to 620 nm with the possibility to compositionally tune the Stokes shift and the self‐trapped exciton emission bands.