Boosting green emission in Mn(ii)-doped Cs3ZnCl5 by introducing an energy transfer mediator

Abstract

In this research, we present an innovative, environmentally friendly, and cost-effective alcohothermal method for synthesizing Mn²⁺ and Mn²⁺–Cu⁺ doped 0D Cs₃ZnCl₅, a green luminescent material, marking the first time this approach has been reported. An exhaustive analysis of the luminescence properties of both undoped and doped Cs₃ZnCl₅ was conducted, with a particular emphasis on the energy transfer mechanisms in the Mn²⁺ mono-doped and Mn²⁺–Cu⁺ co-doped systems. The results demonstrate the successful construction of an efficient energy transfer pathway that significantly enhances the luminescence efficiency of Cs₃ZnCl₅:Mn²⁺. Specifically, the photoluminescence quantum yield of Mn²⁺ within the Cs₃ZnCl₅ matrix has been improved from 51.6% to 71.1%, thanks to the Cu⁺ codopant acting as an effective energy transfer mediator. A mechanism for the luminescence and energy transfer phenomena observed in the Mn²⁺–Cu⁺ co-doped Cs₃ZnCl₅ system has been also proposed. Furthermore, to assess the practical applicability of the synthesized materials, their structural and photoluminescent stability were evaluated. In essence, our study presents a promising solution to current challenges in the synthesis of advanced luminescent materials and opens up new possibilities for harnessing the potential of Mn²⁺-activated 0D metal halides in optoelectronic applications.