Presence of Maximal Characteristic Time in Photoluminescence Blinking of MAPbI₃ Perovskite

Abstract

The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/aenm.202102449.

Self‐Healing Ability of Perovskites Observed via Photoluminescence Response on Nanoscale Local Forces and Mechanical Damage

“…For the time‐averaged PL dynamics to be determined solely by strain, as it is assumed in this theory, the switching of the supertraps must be faster than the strain relaxation time. This agrees with the experiments: The maximum characteristic time of blinking is around 1 s, [ 70 ] while the strain relaxation times are in the range of 20–140 s (Figure 9 ).…”

“…Interestingly, the obtained relaxation times in the range of 10-100 s match the typical timescale of transient processes like PL bleaching and PL enhancement in MHPs. [12,70,75] In the framework of this theory, the PL decline time (see Note S3, Supporting Information) is inversely proportional to the applied force, which generally agrees with the correlation observed experimentally (Figure 6a). As for the PL recovery time, it depends on force only logarithmically (see Note S3, Supporting Information).…”

“…Because the recovery lasts from tens to hundreds of seconds, which is much longer than the characteristic time of PL fluctuations, [ 70 ] we are able to roughly estimate the PL half‐recovery time, defined as the time from the release of the force until the PL intensity reaches 50% of its initial value (see Figure 3c ). The half‐recovery time does not have any obvious correlation with the applied force (see, for example, Figure 5a ).…”

“…Interestingly, the obtained relaxation times in the range of 10–100 s match the typical timescale of transient processes like PL bleaching and PL enhancement in MHPs. [ 12 , 70 , 75 ]…”

A quantitative model of multi-scale single quantum dot blinking

“…A common way to estimate the PSD of the photoluminescence intensity of a single QD is to use the binned intensity trace. 35,37,50 PSD estimation using binned trace works well for digital signals, but has a significant drawback when applied to single photon counting data. In order to reduce the error in estimating the PL intensity, it is necessary to use sufficiently long bins to collect a sufficiently large number of photons per bin.…”