Article
Materials Science, Multidisciplinary
Tatsuya Honbu, Daisuke Takeuchi, Kimiyoshi Ichikawa, Shinya Ohmagari, Tokuyuki Teraji, Masahiko Ogura, Hiromitsu Kato, Toshiharu Makino, Ichiro Shoji
Summary: The density of dislocations in the intrinsic layer of a pin diamond diode was estimated using 2PPL imaging, showing no impact from the generation and diffusion of free carriers. This is important for assessing diamond device performance as it allows for avoiding the influence of free carrier propagation on the adjacent layer.
DIAMOND AND RELATED MATERIALS
(2021)
Article
Optics
Hyeongkyu Cho, Sungmin Jung, Misung Kim, Hyekyeong Kwon, Jiwon Bang
Summary: This study investigated the photophysical properties of heavy-metal-free indium phosphide (InP)-based quantum dots (QDs) and found that introducing Zn additives in the core led to a broadening of the photoluminescence (PL) linewidth. However, the addition of a ZnSeS shell layer eliminated the shallow trap emission and resulted in a PL linewidth solely determined by size dispersion in ensemble QD systems.
JOURNAL OF LUMINESCENCE
(2022)
Article
Materials Science, Multidisciplinary
Doguscan Ahiboz, Elina Andresen, Phillip Manley, Ute Resch-Genger, Christian Wuerth, Christiane Becker
Summary: Photon upconversion upon 1550 nm excitation is greatly enhanced by using silicon metasurfaces, enabling efficient upconversion even at low external illumination conditions. The findings of this study allow for significant reduction of required external excitation intensities, opening perspectives in biophotonics, telecommunication, and photovoltaics.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Energy & Fuels
Fang - Lai, Dan-Hua Hsieh, Jui-Fu Yang, Yu-Chao Hsu, Shou-Yi Kuo
Summary: A systematic investigation was conducted to study the effects of point defects on the efficiency of a CZTSe thin film solar cell using PL and TRPL techniques. The results showed a high concentration of Cu-Zn point defects and also the localization of carriers in CZTSe due to the fluctuating potential caused by [2Cu <(Zn)over bar > Sn-Zn(2+)] defect clusters. These defect clusters were found to cause a shift in band-edge and an increase in series resistance. The study provides valuable insights into the performance deterioration of CZTSe solar cells.
Article
Materials Science, Ceramics
Vijay Singh, Jung-Kul Lee, Aman Prasad, A. S. Rao
Summary: In this study, a series of CaYAl3O7 phosphors doped with different concentrations of Pb2+ were synthesized using an auto solution combustion route. The structure, luminescence, and electron paramagnetic resonance (EPR) spectra of the phosphors were analyzed. XRD patterns confirmed the formation of tetragonal phase CaYAl3O7 with a crystallite size ranging from 37 to 42 nm. SEM images revealed the surface morphology of the prepared samples. The emission spectra showed a wide emission band centered at 362 nm under 270 nm excitation for the phosphors. The EPR spectra of both undoped and Pb2+-doped CaYAl3O7 phosphors exhibited distinct defect centers, namely F+ -centers, with different g-values.
CERAMICS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Yongliang Chen, Simon White, Evgeny A. Ekimov, Carlo Bradac, Milos Toth, Igor Aharonovich, Toan Trong Tran
Summary: We present an ultralow-power, optical thermometry technique for cryogenic temperatures using a two-level system in nanodiamonds. This technique achieves a relative sensitivity of about 20% K-1 at 5 K, higher than other optical nanothermometry methods, while employing excitation powers of just a few tens of nanowatts. We demonstrate its ability to accurately measure temperature differences at various locations on a custom-made microcircuit. This study is significant for the advancement of nanoscale optical thermometry at cryogenic temperatures.
Article
Materials Science, Multidisciplinary
Gangyuan Jia, Kaiyue Wang, Yufei Zhang, Ruiang Guo, Zunpeng Xiao, Yaqiao Wu, Yuming Tian
Summary: The study creates intrinsic optical defects through electron irradiation and investigates the effects of laser power and measurement temperature using spectroscopy. Different optical centers are associated with different defects. Emissions at 2.091 eV and 2.253 eV are attributed to self-interstitial defects.
Article
Materials Science, Multidisciplinary
Aleksei O. Murzin, Nikita I. Selivanov, Vadim O. Kozlov, Ivan I. Ryzhov, Tsutomu Miyasaka, Alexei V. Emeline, Yury V. Kapitonov
Summary: This study investigated the properties of MAPbI(3) halide perovskite single crystals at 5K temperature using photoluminescence excitation spectroscopy, revealing bound excitons and defect-related states. A method to separate defect-related luminescence spectra was proposed. The results of this study pave the way for exploring low-density defects and dopants in halide perovskite semiconductors.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Chaojie Li, Malgorzata Sojka, Jiyou Zhong, Jakoah Brgoch
Summary: A broad NIR emission material, Mg3Gd2Ge3O12, is found to be suitable for NIR spectroscopy and can be combined with LEDs to create efficient NIR light sources for food-quality analysis.
DALTON TRANSACTIONS
(2023)
Article
Materials Science, Multidisciplinary
Kaiyue Wang, Wenjin Zhang
Summary: In this study, the emission properties of single vacancy in diamond were investigated using low-temperature photoluminescence (PL) technology. By comparing the experimental results with the calculated results, it was found that for ultrapure diamond, the vacancy mainly existed in the form of neutral rather than negatively charged.
MATERIALS SCIENCE-MEDZIAGOTYRA
(2022)
Article
Chemistry, Physical
Peter Udvarhelyi, Anton Pershin, Peter Deak, Adam Gali
Summary: This study demonstrates that the C-centre in silicon can be used as an optically readable quantum register in the L-band wavelength region. Through theoretical characterisation and experimental research, the properties of the C-centre are closely examined, and quantum optics protocols are established for controlling and reading the quantum states. These findings provide new possibilities for the development of silicon-based quantum technology.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Vadim Sedov, Sergei Kuznetsov, Irina Kamenskikh, Artem Martyanov, Dmitry Vakalov, Sergei Savin, Elizaveta Rubtsova, Vitaly Tarala, Sergey Omelkov, Aleksei Kotlov, Victor Ralchenko, Vitaly Konov
Summary: Diamond composite materials embedded with YAG:Ce nanoparticles were produced by CVD, showing high-intensity X-ray luminescence. The nanoparticles were synthesized by co-precipitation, while diamond served as a matrix with excellent thermal conductivity and hardness. The study suggests a new way to control X-ray visualization for fast X-ray detectors and screens.
Article
Chemistry, Physical
Wen-Shuo Kuo, Ping-Ching Wu, Chia-Yuan Chang, Jiu-Yao Wang, Pei-Chi Chen, Miao-Hsi Hsieh, Sheng-Han Lin, Jen-Suo Cheng, Yu-Tsung Chou
Summary: By chemically modifying graphene quantum dot materials through nitrogen doping and amino-group functionalization, this study improved electron donation efficiency, enhancing absorption, luminescence, radiative efficiency, and other properties.
Article
Chemistry, Physical
George K. Krasin, Michael S. Kovalev, Sergey Kudryashov, Pavel A. Danilov, Victor P. Martovitskii, Iliya Gritsenko, Ivan M. Podlesnykh, Roman A. Khmelnitskii, Evgeny Kuzmin, Yulia S. Gulina, Alexey O. Levchenko
Summary: In this study, single-shot surface ablation of natural diamond plates was conducted using tightly focused laser pulses, and the relationship between crystallographic directions, bandgap widths, and crater characteristics was investigated. Anti-correlating azimuthal dependences were observed in both surface craters and bulk diamond properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Ying Zhou, Xin Li, Lili Xi, Jiong Yang
Summary: In this study, first-principles calculations were used to investigate the complex intrinsic defects of four ternary diamond-like ABX(2) compounds (A: Cu/Ag; B: In; X: Te/Se). The results indicate that Cu-based compounds tend to generate acceptor VA defects with p-type, while Ag-based compounds tend to form donor BA defects with n-type. These findings were analyzed using the newly introduced density of energy (DOE).
JOURNAL OF MATERIOMICS
(2021)
Article
Spectroscopy
K. K. Rahul, E. Shivakarthik, J. K. Meka, A. Das, V. Chandrasekaran, B. N. Rajasekhar, J. -I. Lo, B. -M. Cheng, P. Janardhan, A. Bhardwaj, N. J. Mason, B. Sivaraman
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2020)
Article
Nanoscience & Nanotechnology
Hsiao-Chi Lu, Jen-Iu Lo, Yu-Chain Peng, Sheng-Lung Chou, Bing-Ming Cheng, Huan-Cheng Chang
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Spectroscopy
K. K. Rahul, J. K. Meka, S. Pavithraa, P. Gorai, A. Das, J. -I. Lo, B. N. Raja Sekhar, B. -M. Cheng, P. Janardhan, A. Bhardwaj, N. J. Mason, B. Sivaraman
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2020)
Article
Spectroscopy
J. F. Ogilvie, Sheng-Lung Chou, Yu-Chain Peng, Jen-Iu Lo, Bing-Ming Cheng
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2020)
Article
Astronomy & Astrophysics
Jen-Iu Lo, Yu-Chain Peng, Sheng-Lung Chou, Hsiao-Chi Lu, Bing-Ming Cheng
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Optics
Jen-Iu Lo, Yu-Chain Peng, Hsiao-Chi Lu, Bing-Ming Cheng
Article
Multidisciplinary Sciences
Mark Elowitz, Bhalamurugan Sivaraman, Amanda Hendrix, Jen-Iu Lo, Sheng-Lung Chou, Bing-Ming Cheng, B. N. Raja Sekhar, Nigel J. Mason
Summary: By analyzing far-ultraviolet reflectance spectra on the leading and trailing hemispheres of Rhea, a moon of Saturn, researchers found that hydrazine monohydrate and chlorine-containing molecules provide a good fit to the unidentified absorption feature near 184 nm. Considering the radiation-dominated chemistry on icy satellite surfaces, hydrazine monohydrate is proposed as the most plausible candidate for explaining the absorption feature. The presence of hydrazine on the surface is believed to not be from spacecraft fuel, as Cassini's thrusters were not used during flybys of icy satellites.
Article
Astronomy & Astrophysics
Jen-Iu Lo, Rana Ghosh, Hsiao-Chi Lu, Wei-Hsiu Hung, Bing-Ming Cheng
Summary: The thermal variation of absorption spectra of icy ethene was measured from 13 to 100 K, showing that ethene ices might exhibit three structures within the temperature range of 13-60 K. This study enhances our understanding of the spectra of icy ethene at low temperatures and astrochemistry in cold astro-environments.
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
(2021)
Article
Chemistry, Physical
N. Fabian Kleimeier, Yiwei Liu, Andrew M. Turner, Leslie A. Young, Chih-Hao Chin, Tao Yang, Xiao He, Jen-Iu Lo, Bing-Ming Cheng, Ralf Kaiser
Summary: NASA's New Horizons mission revealed a diverse landscape of Pluto's surface, with laboratory experiments and electronic structure calculations demonstrating that the photolysis of solid acetylene efficiently synthesizes benzene and polycyclic aromatic hydrocarbons, providing critical molecular building blocks for the colored surface material.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Astronomy & Astrophysics
Jen-Iu Lo, Hsiao-Chi Lu, Wei-Hsiu Hung, J. F. Ogilvie, Bing-Ming Cheng
Summary: We report the spectra of molecular oxygen in the visible, near-infrared, and mid-infrared wavelength ranges at different temperatures. Different features, such as sharp lines and triplets, were observed depending on the temperature. The transmission of solid oxygen also showed temperature-dependent behavior, with a significant absorption observed in the mid-infrared range.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Teng- Yang, Yuen Yung Hui, Jen-Iu Lo, Yu-Wen Huang, Yin-Yu Lee, Bing-Ming Cheng, Huan-Cheng Chang
Summary: This study demonstrates the use of fluorescent nanodiamonds (FNDs) with nitrogen-vacancy (NV) centers as scintillators for imaging and characterizing extreme ultraviolet (EUV) radiation. The FNDs form a stable thin film and can emit bright red fluorescence when excited by EUV light. An FND-based imaging device has been developed for beam diagnostics of synchrotron radiations.
Article
Engineering, Electrical & Electronic
Jen-Iu Lo, Yu -Chain Peng, Hsiao-Chi Lu, Ton-Rong Tseng, Bing -Ming Cheng
Summary: Extreme-ultraviolet lithography utilizes Mo/Si multilayer mirror for producing nanochips in semiconductor fabrication, with the photoluminescence property used to monitor mirror temperature effectively.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Jen-Iu Lo, Yu-Chain Peng, Hsiao-Chi Lu, Ton-Rong Tseng, Bing-Ming Cheng
Summary: Extreme-ultraviolet lithography utilizes a Mo/Si multilayer mirror to create nanochips, which emits intense photoluminescence in a specific wavelength range depending on its operational temperature. This property can be utilized for real-time temperature monitoring of the mirror.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Astronomy & Astrophysics
Jen-Iu Lo, Hsiao-Chi Lu, Yu-Chain Peng, Sheng-Lung Chou, Bing-Ming Cheng
Summary: The study found that vacuum-ultraviolet (VUV) radiation may trigger the formation of hydrogenated amorphous carbons and carbon nanotubes as residues, leading to the formation of carbonaceous dust in space.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Hsiao-Chi Lu, Jen-Iu Lo, Yu-Chain Peng, Bing-Ming Cheng
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2020)
