Highly Emissive Self-Trapped Excitons in Fully Inorganic Zero-Dimensional Tin Halides.

Angewandte Chemie
Bogdan M BeninMaksym V Kovalenko

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 SnII 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 Ax Sn(Br1-y Iy )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.

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Feb 19, 2019·Advanced Materials·Romain GautierMichael Paris
Jul 30, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Gyanendra B AyerHans-Conrad Zur Loye
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Aug 20, 2019·ACS Applied Materials & Interfaces·Jiajun LuoJiang Tang

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