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Room temperature two-photon-pumped random lasers in FAPbBr₃/polyethylene oxide (PEO) composite perovskite thin film.

ABSTRACT: Solution-processed organic-inorganic halide lead perovskites have attracted increasing attention due to their great potential in low-cost, effective, and versatile light emission applications and large-scale portable optoelectronic devices. In this paper, formamidinium lead tribromide perovskite thin films composited with polyethylene oxide (PEO) were fabricated by a solution processing method. Great enhancement of photoluminescence was observed and more attractively, two-photon-pumped random lasing action could be achieved at room temperature when pumped by a nanosecond pulse laser with excitation wavelength centered at 1064 nm. Evident transition from spontaneous upconversion emission to random lasing action was investigated by monitoring the log-log light emission slope and peak width at half height. The lasing threshold is at around 1.1 mJ cm^-2, which is comparable to that of other two-photon upconversion random lasers. The efficient random lasing emission originates from the multiple random scattering provided by the micrometer-scale rugged morphology and polycrystalline grain boundaries. Compared with conventional lasers that normally serve as a coherent light source, the perovskite random lasers show promise in fabricating low-cost thin-film lasing devices for flexible and speckle-free imaging applications.

SUBMITTER: Xu L

PROVIDER: S-EPMC9088892 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Room temperature two-photon-pumped random lasers in FAPbBr<sub>3</sub>/polyethylene oxide (PEO) composite perovskite thin film.

Xu Long L Meng Yan Y Xu Caixia C Chen Ping P

RSC advances 20181001 64

Solution-processed organic-inorganic halide lead perovskites have attracted increasing attention due to their great potential in low-cost, effective, and versatile light emission applications and large-scale portable optoelectronic devices. In this paper, formamidinium lead tribromide perovskite thin films composited with polyethylene oxide (PEO) were fabricated by a solution processing method. Great enhancement of photoluminescence was observed and more attractively, two-photon-pumped random la ...[more]

PMID: 35558947

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Project description:One of the most effective approaches to optimizing the performance of perovskite solar cells is to fully understand the ultrafast carrier dynamics at the interfaces between absorber and transporting layers at both the molecular and atomic levels. Here, the injection dynamics of hot and relaxed charge carriers at the interface between the hybrid perovskite, formamidinium lead bromide (FAPbBr3), and the organic electron acceptor, IEICO-4F, are investigated and deciphered by using femtosecond (fs) mid-infrared (IR), transient absorption (TA), and fluorescence spectroscopies. The visible femtosecond-TA measurements reveal the generation of hot carriers and their transition to free carriers in the pure FAPbBr3 film. Meanwhile, the efficient extraction of hot carriers in the mixed FAPbBr3/IEICO-4F film is clearly evidenced by the complete disappearance of their spectral signature. More specifically, the time-resolved results reveal that hot carriers are injected from FAPbBr3 to IEICO-4F within 150 fs, while the transfer time for the relaxed carriers is about 205 fs. The time-resolved mid-IR experiments also demonstrate the ultrafast formation of two peaks at 2115 and 2233 cm-1, which can be attributed to the C≡N symmetrical and asymmetrical vibrational modes of anionic IEICO-4F, thus providing crystal clear evidence for the electron transfer process between the donor and acceptor units. Moreover, photoluminescence (PL) lifetime measurements reveal an approximately 10-fold decrease in the donor lifetime in the presence of IEICO-4F, thereby confirming the efficient electron injection from the perovskite to the acceptor unit. In addition, the efficient electron injection at the FAPbBr3/IEICO-4F interface and its impact on the C≡N bond character are experimentally evidenced and align with density functional theory (DFT) calculations. This work offers new insights into the electron injection process at the FAPbBr3/IEICO-4F interface, which is crucial for developing efficient optoelectronic devices.

Dataset Information

Room temperature two-photon-pumped random lasers in FAPbBr₃/polyethylene oxide (PEO) composite perovskite thin film.

Publications

Room temperature two-photon-pumped random lasers in FAPbBr<sub>3</sub>/polyethylene oxide (PEO) composite perovskite thin film.

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Room temperature two-photon-pumped random lasers in FAPbBr3/polyethylene oxide (PEO) composite perovskite thin film.

Publications

Room temperature two-photon-pumped random lasers in FAPbBr<sub>3</sub>/polyethylene oxide (PEO) composite perovskite thin film.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

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Room temperature two-photon-pumped random lasers in FAPbBr₃/polyethylene oxide (PEO) composite perovskite thin film.