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Abstract
In this work, novel two-dimensional lead-free double perovskites ((R)4MaMbMcX8, a+b+c=2) were synthesized to achieve novel compositional and dimensional tunability. Specifically, manganese (Mn2+) is incorporated into (PA)4AgInBr8 (PA = CH3(CH2)2NH3+) to form (PA)4Ag1-0.5xMnxIn1-0.5xBr8 (0 ≤ x ≤ 1). These samples were tuned to be PL-emissive under room temperature via this manganese alloying strategy. Three emission pathways can be investigated: band edge emission, emission stemming from self-trapped excitons, and the energy transfer processes associated with Mn2+ center energy levels. Temperature-dependent PL elucidates two emissive modes: self-trapped exciton emission as well as Mn-center emission based on analysis of the associated Huang-Rhys factors. Overall, this work informs the development of additional light-emissive 2D lead-free double perovskites.
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