02243nas a2200241   4500008004100000022001400041245017400055210006900229260000800298300001400306490000700320520136100327653002301688653002201711653002001733653002601753653001301779653002601792100001501818700002301833700001401856856013101870       2017                        eng d  a0897-475600aEfficient exciton to dopant energy transfer in Mn2+-Doped (C<inf>4</inf>H<inf>9</inf>NH<inf>3</inf>)<inf>2</inf>PbBr<inf>4</inf> two-dimensional (2D) layered perovskites0 aEfficient exciton to dopant energy transfer in Mn2Doped Cinf4inf  cSEP  a7816-78250 v293 aThree-dimensional ABX3 perovskite material has attracted immense interest and applications in optoelectronic devices, because of their enabling properties. Recently, Mn2+ doping directly into APbCl3-type three-dimensional (3D) nanocrystals, manifesting host-to-dopant energy transfer, have been reported for LED display applications. Strongly bound excitons in the doped system can enhance the dopant-carrier exchange interactions, leading to efficient energy transfer. Here, we report the simple and scalable synthesis of Mn2+-doped (C4H9NH3)2PbBr4 two-dimensional (2D) layered perovskites. The Mn2+-doped 2D perovskite shows enhanced energy transfer efficiency from the strongly bound excitons of the host material to the d electrons of Mn2+ ions, resulting in intense orange-yellow emission, which is due to spin-forbidden internal transition (4T1 → 6A1) with the highest quantum yield (Mn2+) of 37%. Because of this high quantum yield, stability in ambient atmosphere, and simplicity and scalability of the synthetic procedure, Mn2+-doped 2D perovskites could be beneficial as color-converting phosphor material and as energy down-shift coating for perovskite solar cells. The newly developed Mn2+-doped 2D perovskites can be a suitable material to tune dopant-exciton exchange interactions to further explore their magneto-optoelectronic properties.10aDoping (additives)10aEnergy Efficiency10aEnergy Transfer10aExchange interactions10aExcitons10aLight Emitting Diodes1 aBiswas, A.1 aBakthavatsalam, R.1 aKundu, J.  uhttps://library.ncl.res.in/content/efficient-exciton-dopant-energy-transfer-mn2-doped-c4h9nh32pbbr4-two-dimensional-2d-layered