Piston Error Measurement for Segmented Telescopes Based on a Hybrid Artificial Neural Network.

To address the difficulty and complexity of detecting piston errors for segmented telescopes, this paper proposes a new piston error measurement method based on a hybrid artificial neural network. First, we use the Resnet network to learn the mapping relationship between the focal plane degradation image and signs of the piston error. Then, based on the established theoretical relationship between the modulation transfer function and the piston error, a BP neural network is used to learn the mapping relationship between the and the absolute value of the piston error.

Structural, Optical, Electrical, and Thermoelectric Properties of BiSe Films Deposited at a High Se/Bi Flow Rate.

Low-temperature synthesis of BiSe thin film semiconductor thermoelectric materials is prepared by the plasma-enhanced chemical vapor deposition method. The BiSe film demonstrated excellent crystallinity due to the Se-rich environment. Experimental results show that the prepared BiSe film exhibited 90% higher transparency in the mid-IR region, demonstrating its potential as a functional material in the atmospheric window.

Ultra-Smooth and Efficient NiO/Ag/NiO Transparent Electrodes for Flexible Organic Light-Emitting Devices.

We demonstrate highly flexible and efficient organic light-emitting devices (OLEDs) using an ultra-smooth NAN anode. A template-stripping process was employed to create an ultra-smooth NAN anode on a photopolymer substrate. The flexible OLEDs obtained by this method maintained good electroluminescent properties and mechanical stability after bending.

Epitaxial Growth of BiSe Infrared Transparent Conductive Film and Heterojunction Diode by Molecular Beam Epitaxy.

Epitaxial -type infrared transparent conductive BiSe thin film was cultivated by molecular beam epitaxy (MBE) method on AlO (001) substrate. The orientation between BiSe and the substrate is BiSe(001)//AlO(1 10). Conducting mechanism ensued the small-polaron hopping mechanism, with an activation energy of 34 meV.

Higher Light Extraction Efficiency in Organic Light-Emitting Devices by Employing 2D Periodic Corrugation.

Photons trapped in the form of waveguide (WG) modes associated with the organic-organic interface and in the form of surface plasmon polariton (SPP) modes associated with the metallic electrode-organic interface result in a large energy loss in organic light-emitting devices (OLEDs). Introducing gratings onto the metallic electrode is especially crucial for recovering the power lost to the associated SPP modes. In our research, we demonstrate the efficient outcoupling of SPP modes in TE mode by two-dimensional (2D) grating, which cannot excited in one-dimensional (1D) grating OLED.

Bright Perovskite Nanocrystal Films for Efficient Light-Emitting Devices.

The high photoluminescence efficiency, high color purity, and easy tunable bandgap make inorganic perovskite nanocrystals very attractive in luminescent display applications. Here, we report a color-saturated, red light-emitting diode (LED) using an inverted organic/inorganic hybrid structure and perovskite nanocrystals. We demonstrated that through a simple post treatment to the perovskite nanocrystals with polyethylenimine, the surface defects of the perovskite nanocrystals could be well passivated, leading to great enhancements on their absolute photoluminescence quantum yield and photoluminescence lifetime.