How manganese changes the color of perovskite

Date: 16 October 2018

Venue: UAntwerpen, Campus Groenenborger, Room U.247 - Groenenborgerlaan 171 - 2020 Antwerpen

Time: 4:00 PM - 5:00 PM

Organization / co-organization: Condensed Matter Theory

Short description: Condensed Matter Theory lecture presented by Prof. Hasan Sahin from the Izmir Institute of Technology



How manganese changes the color of perovskite

Abstract:

In my talk, I'll present our recent results on Cesium lead perovskites which are suitable materials for various optoelectronic applications due to their exceptionally good optical properties. The effect of Mn doping on the structural and optical properties of cesium lead halide perovskite crystals are investigated from both experimental and theoretical points of view. It is found that adding MnCl2 during the synthesis not only leads to a Mn-driven structural phase transition from Cs4PbBr6 to CsPbCl3 but also triggers the Br– to Cl– halide exchange. On the other hand, it is observed that, under UV illumination, the color of Mn-doped crystals changes from orange to blue in approximately 195 h. While the intensity of Mn-originated photoluminescence emission exponentially decays in time, the intensity of CsPbCl3-originated emission remains unchanged. In addition, diffusive motion of Mn ions results in both a growing population of MnO2 at the surface and transition of the host into a cesium-rich Cs4PbCl6 phase. 



Contact email: lucian.covaci@uantwerpen.be

Link: http://cmt.uantwerpen.be