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Inorganic halide perovskite nanomaterials have attracted attention because of their potential in the field of light-emitting diodes (LEDs), liquid crystal displays, and nonlinear optical imaging. Herein, CsPbBr3nanorods (NRs) have been investigated in detail; meanwhile, the cubic CsPbBr3nanocrystals (NCs) act as a reference. The CsPbBr3NRs with anisotropic properties show that their photoluminescence (PL) intensity and radiative lifetime are sensitive to the polarization direction. Through changing the temperature and pressure, the energy band, carrier dynamics, and radiative channel of CsPbBr3NRs have been compared to CsPbBr3NCs, and their excellent PL properties benefit from radiative recombination. Moreover, CsPbBr3NRs exhibit apparent two-photon fluorescence (TPF), and their two-photon absorption (TPA) section is about 4656.5 GM and lower than that of CsPbBr3NCs. Our results provide comprehensive insight into the optoelectronic properties of inorganic halide perovskite nanomaterials and highlight their potential in the optoelectronic field.

We prepared the polymer solar cell based on poly(3-hexylthiophene)(P3HT)/fullerene derivative PCBM(PCBM=[6,6]-phenyl-C61-butyric acid methyl ester) heterojunction and investigated the irradiation intensity-dependent charge recombination dynamics of heterojunction employing nanosecond transient absorption spectroscopy with bias light so as to simulate the photophysical process in heterojunction when the photovoltaic device is on operation. The experimental data exhibit that the yield of free charges gradually decreases and the loss of mobile carriers originated from bimolecular recombination simultaneously increases as the irradiation intensity gradually enhances. This indicates that the polymer solar cell is much suitably used at a low irradiation intensity.

Laser-induced breakdown spectroscopy(LIBS) was used to in situmonitor the concentration of alkali elements in combustion environments. Particular efforts were made to optimize the temporally resolved spectra of Na and K elements. Calibration curves were constructed by relating the intensities of the specific lines to the corresponding elemental concentrations. The detection limits of Na and K elements were found to be temperature-dependent. The results indicate that LIBS can be a powerful tool for in situmonitoring Na and K concentrations in combustion environments.

We investigate the fluorene-vinylene unit dependent photo-physical properties of multi-branched truxene based oligomers (Tr-OFVn, n=1-4) employing steady-state absorption and emission spectroscopy, transient absorption spectroscopy, two-photon fluorescence, and z-scan technique. The results show that the increasing of fluorene-vinylene unit leads to a red-shift in the spectra of absorption and fluorescence, and shortens the excited state lifetime. Meanwhile, two-photon fluorescence efficiency and two-photon absorption cross section of truxene based oligomers gradually enhance in company with the extension of ?-conjugated length. In addition, the values of two-photon absorption cross section modeled on the sum-over-state approach agree well with the experimental ones. The results indicate multi-branched truxene based oligomers bearing oligo(fluorene-vinylene) arms are promising organic materials for two-photon applications.

In this study, we derived explicitly the zero-frequency first hyperpolarizabilities of tripod like chiral molecules based on a three-coupled-oscillator model and determined the relations of the zero-frequency first hyperpolarizabilities with molecular structure, molecular chirality and the wavelength of incident light. Furthermore, we also simulated numerically the influences of microscopic parameters of chiral molecules and the wavelength of incident light on the first zero-frequency hyperpolarizabilities. We observed fact that the influences of microscopic parameters of chiral molecules on zero-frequency first hyperpolarizabilities is different by using different chiral molecular microscopic parameters such as bond angle and molecular chirality. Furthermore, the influences of microscopic molecular parameters on the first zero-frequency hyperpolarizabilities can also help to comprehend nonlinear optical mechanism of chiral molecules.

We compare the fluorescence characteristics of conjugated molecules (coumarin 6, C-6) in solution, aggregation state, and poly(methyl methacrylate) PMMA opal photonic crystals (PCs), and investigate the manipulation mechanism of PCs on C-6. We find that the PCs effectively inhibit the aggregate-induced fluorescence quenching of C-6 by breaking the intermolecular interaction and manipulate the fluorescence characteristics of C-6 by changing the photonic stop band (PSB). The emission traces of C-6 have been analyzed using the continuous rate distribution model. The control of fluorescence characteristics of C-6 in PCs depends on the mesh microporous structure and the PSB of PCs.

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