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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. Moreover, the samples were tuned to be PL-emissive under room temperature via a manganese alloying strategy. Bandgap and PL emission turnability were explored through halogen substitution (chlorine and iodine). An enhanced PL emission was observed for mixed halogen phases. Three emission pathways are possible to be investigated including band edge emission, emission stemmed from self-trapped excitons and the unique energy transfer process of alloyed Mn2+ ions, which will be discussed.
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