Spatially correlated photoluminescence blinking and flickering of hybrid-halide perovskite micro-rods
| Autor: | Susmita Buragohain, Chinmay Phadnis, Arindam Chowdhury, Nithin Pathoor, Tejmani Behera |
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| Rok vydání: | 2020 |
| Předmět: |
Spatial correlation
Materials science Photoluminescence Biophysics 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Emission intensity Molecular physics Instability Atomic and Molecular Physics and Optics Rod 0104 chemical sciences law.invention law Intermittency Crystallite 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of Luminescence. 223:117202 |
| ISSN: | 0022-2313 |
| Popis: | Temporally stochastic, abrupt photoluminescence (PL) intermittency (blinking) has been long recognized to be characteristic of single quantum-emitters as intensity fluctuations average out over the ensemble. While there are a few rare examples of PL blinking in spatially extended (~μm) yet quantum-confined (1 or 2-D) nanostructures, such phenomenon is in general spatiotemporally uncorrelated. However, recent investigations on organo-metal iodide perovskite nano-/micro-rods have revealed that blinking is plausible even in larger structures. Here, we report abrupt and discrete PL instability of entire individual methylammonium lead bromide (MAPbBr3) single-crystal rods of dimensions between 1 and 2 μm. Intriguingly, similar to bulk polycrystalline disks of MAPbBr3, these dimensionally unconfined micro-rods exhibit spatially-synchronous multi-level PL intermittency, on top of a slow time-varying base emission intensity. Here, we find two dominant intermittency characteristics, one of which is more abrupt (discrete) while the other is relatively gradual, designated as "blinking" and "flickering" respectively. One of the two intermittency behaviors is found to dominate in each micro-rod in the ensemble; however, both flickering and blinking have an extremely high spatial correlation of intensity fluctuations at short distances ( |
| Databáze: | OpenAIRE |
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