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

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 Cs_4-x A_x Sn(Br_1-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.

SUBMITTER: Benin BM 

PROVIDER: S-EPMC6175341 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature