Spatially correlated photoluminescence blinking and flickering of hybrid-halide perovskite micro-rods

Revealing Dynamic Effects of Mobile Ions in Halide Perovskite Solar Cells Using Time‐Resolved Microspectroscopy

“…In contrast, small‐sized (≈20 nm) Cs 3 Bi 2 I 6 Cl 3 double perovskite showed temporal intermittency in PL emission. [ 76 ] The similar PL blinking phenomenon was commonly observed in micrometer‐sized MAPbBr 3 microcrystal, [ 72,77 ] single‐crystal rods, [ 71 ] single grains in MAPbI 3 thin film, [ 74,78 ] inorganic CsPbBr 3 nano‐spheres, [ 70 ] aggregated CsPbBr 3 nanocrystals, [ 75,79 ] and double perovskite Cs 3 Bi 2 I 6 Cl 3 nanocrystals, 2D nanosheets [ 76 ] and Cs 3 Bi 2 I 9 nanoplatelets. [ 80 ]…”

“…Different from the conventional semiconductor QDs, significant fluorescence intermittency has been observed in perovskite grains and rods that have a size of hundreds of nanometers or even micrometers. [ 69–72 ] Wen et al. [ 69 ] found fluorescence intermittency in individual perovskite grains in vapor‐assisted fabricated MAPbBr 3 thin film via a confocal microscopy, which is composed of nanoparticles (grains) in close contact with each other, as shown in Figure A.…”

Conversion of Electrochemically Deposited Aragonite Crystallites to Perovskite through In Situ Ion Exchange

“…A video recording taken during the FM experiment scanning a small area of the sample shows that these regions of different emission intensity on individual microstructures exhibit fluorescence blinking (Supporting Video 1), a phenomenon observed previously in CsPbBr3 PNCs but typically not microstructures. 35,[39][40] Fluorescence blinking is a phenomenon that is attributed to the Auger-ionization of single nanocrystals, whereby electrons are ejected from the particle and subsequent excitons relax non-radiatively to the ground state, leaving the positively charged particle non-emissive until it is neutralized. [41][42][43] We employed inductively coupled plasma mass spectrometry (ICP-MS) to better determine a chemical composition of the fully converted microstructures (Table S2).…”

Influence of Atmospheric Constituents on Spectral Instability and Defect-Mediated Carrier Recombination in Hybrid Perovskite Nanoplatelets

“…In this context, probing PL intermittency (“blinking”) of OHP nanocrystals (NCs), − microcrystalline rods, , and films ,− becomes relevant to study the nature of defect states under different environments . While PL intermittency for OHP NCs has been related to surface defects involved in carrier recombination pathways, ,− similar to that for conventional inorganic NCs, blinking/flickering of microcrystalline disks/thin-films ,, is attributed to transient mobile defects which act as strong quenchers. , More importantly, different blinking characteristic as well as gradual change in PL intensity over slower time scales (second to minute) has been ascribed to generation or passivation of various (deep/shallow) trap states during degradation or curing of the material in the presence of light ,− and atmospheric conditions. ,,,, Thereby, nature of the defects involved in the emission cycle have often been related to the emissivity of the crystals. ,,,− However, PL intermittency and emissivity of OHP NCs from different systems are found to be contrasting under the similar atmospheric conditions suggesting the different nature of active defects. , Moreover, like inorganic quantum dots, OHP NCs of similar composition and morphology can also exhibit heterogeneous blinking characteristics in the ensemble under identical measurement conditions which likely owes to diverse origin and distribution of defects in the crystals. , Therefore, it is necessary to investigate the same NC as well as the large population of individual OHP crystals under sequential environments in order to reliably correlate their PL characteristics, which has rarely been attempted …”

“…Such information provides insight on atmosphere induced degradation of OHPs and thus, it is crucial to investigate the nature of active photoinduced traps under specific environmental conditions. In this context, probing PL intermittency ("blinking") of OHP nanocrystals (NCs), 33−35 microcrystalline rods, 36,37 and films 34,38−40 becomes relevant to study the nature of defect states under different environments. 14 While PL intermittency for OHP NCs has been related to surface defects involved in carrier recombination pathways, 14,33−35 similar to that for conventional inorganic NCs, 41 blinking/flickering of microcrystalline disks/thin-films 36,38,39 is attributed to transient mobile defects which act as strong quenchers.…”