Article
Chemistry, Physical
Hyejeong Jang, Dongju Jung, Wan Ki Bae, Young-Shin Park, Doh C. Lee
Summary: Semiconductor nanocrystals with an anisotropic morphology, known as dot-in-rod (DIR) structure, exhibit unique properties such as linear polarization. In this study, CdSe/CdS DIR nanocrystals were synthesized, and the position of the CdSe core particle within the nanorods was controlled by varying the ligand compositions during CdS growth. The degree of linear polarization varied depending on the core position, with higher polarization observed for center-core DIRs compared to tip-core DIRs. Time-resolved photoluminescence analysis revealed that center-core DIRs had stronger electron-hole interaction due to weak uniaxial strain caused by lattice dislocations at the interface.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Ja-Hon Lin, Gung-Rong Chen, Sheng-Jie Li, Yu-Feng Song, Wei-Rein Liu
Summary: This study investigates the polarization characteristics of amplified spontaneous emissions (ASEs) from ZnO/Zn0.8Mg0.2O multiple quantum wells (MQWs) and finds linear polarization under pulsed light excitation. The findings have practical significance for the application of microcavity lasers in metrology and biomedical imaging.
Article
Physics, Applied
Y. E. Maidebura, T. V. Malin, K. S. Zhuravlev
Summary: The experimental data and calculated concentration of ammonia fragments on the GaN surface show that moving adsorbed ammonia fragments into strongly bound states is an effective mechanism to control the GaN morphology. The minimum equivalent NH3 beam pressure at different temperatures to prevent the conversion of the 2D GaN layer to 3D islands has been established, with the boundary between the 2D and 3D states on the surface determined by the elemental composition of adsorbed particles and the temperature dependence of island facets' surface energy.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Shunwei Chen, Yuhang Jiang, Shangke Jia, Hao Liu, Guangwei Zhang, Xiujun Han, Ruiqin Zhang
Summary: The study reveals that phenine nanotubes (pNTs) exhibit different semiconductor properties compared to single-walled carbon nanotubes (SWCNTs), with spatial separation in the HOMO and LUMO due to periodic structural vacancies. Chemical modifications such as hydrogenation greatly broaden the light absorption/emission range, while diameter variation has negligible influence on property tuning. Low-dose hydrogenation is predicted to be an effective strategy for enhancing luminescence.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Review
Materials Science, Multidisciplinary
Yadong Zhang, Shu Yu, Bing Han, Yunlong Zhou, Xiuwen Zhang, Xiaoqing Gao, Zhiyong Tang
Summary: Due to their magnetic photophysical properties, circularly polarized luminescence (CPL) materials have attracted significant interest. This review provides a comprehensive overview of this field, including theory, experiments, and categorization of CPL-active materials. It also discusses the factors influencing the dissymmetry factor and luminescence efficiency, as well as the opportunities and challenges for enhancing both factors.
Article
Chemistry, Analytical
Juan Yang, Dongmiao Qin, Na Wang, Yusheng Wu, Kanjun Fang, Biyang Deng
Summary: A novel sandwich electrochemiluminescence biosensor was developed for the sensitive detection of Afl42 using aggregation-induced electrochemiluminescence resonance energy transfer. The biosensor utilized silver nanoparticle-functionalized zinc metal-organic framework as the ECL donor and gold nanoparticle-functionalized zirconium organic framework as the acceptor. The method exhibited a linear detection range of 10 fg/mL to 100 ng/mL and a detection limit of 2.4 fg/mL. It also demonstrated good stability, repeatability, and specificity, making it a promising tool for disease biomarker detection.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Takahisa Omata, Hiroshi Asano, Masahiro Sakai, Yoshikazu Terai, Masao Kita
Summary: The research found that the valley splitting of PbSe quantum dots can be significantly enhanced by controlling the thickness of the CdSe shell in varying inter-QD distances. When the inter-QD distance is large, Forster resonance energy transfer causes a redshift in photoluminescence emission.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yalian Weng, Guixiong Chen, Junyang Nie, Sihua Que, Suk-Ho Song, Yongshen Yu, Fan Zhang, Hengshan Liu, Xiongtu Zhou, Yongai Zhang, Jie Sun, Jang-Kun Song, Chaoxing Wu, Tailiang Guo, Qun Yan
Summary: This work proposed a novel hybrid device of organic LEDs and inorganic blue GaN LEDs, which can achieve full white and other colors. By applying timing variable opposite voltages, the hybrid device can independently control the emission from blue LEDs or stacked OLEDs to form mixed colors. It has a high color gamut and color rendering index, indicating potential applications in smart solid-state lighting, display, and light communication.
Article
Chemistry, Multidisciplinary
Ying Tang, Qilin Qin, Hongyu Yang, Shengnan Feng, Chunfeng Zhang, Jiayu Zhang, Min Xiao, Xiaoyong Wang
Summary: This study demonstrates the ability to decrease the Auger decay and radiative rates in semiconductor nanocrystals by applying external electric fields. The decrease in the Auger rate is attributed to enhanced exciton-exciton repulsion, while the decrease in the radiative rate is attributed to weakened electron-hole exchange interaction. These findings highlight the potential of using external electric fields as a post-synthetic approach to manipulate the exciton recombination dynamics in semiconductor nanocrystals.
Article
Optics
Junling Qu, Mateusz Weis, Eva Izquierdo, Simon Gwenael Mizrahi, Audrey Chu, Corentin Dabard, Charlie Greboval, Erwan Bossavit, Yoann Prado, Emmanuel Peronne, Sandrine Ithurria, Gilles Patriarche, Mathieu G. Silly, Gregory Vincent, Davide Boschetto, Emmanuel Lhuillier
Summary: This paper reports the design of a HgTe nanocrystal-based LED with emission between 2 and 2.3 mu m, showing competitive performance with an external quantum efficiency of 0.3% and radiance up to 3 W Sr-1 m(-2) for wavelengths above 2 mu m.
Article
Chemistry, Multidisciplinary
Ming Mei, Minju Kim, Minwoo Kim, Inhong Kim, Hong Seok Lee, Robert A. Taylor, Kwangseuk Kyhm
Summary: The optical modal gain of Cd0.6Zn0.4Te/ZnTe double quantum dots was measured using a variable stripe length method. Two gain spectra were observed with a large separation layer thickness of ZnTe, corresponding to the exciton levels of the large and small quantum dots. With a small separation layer thickness of ZnTe, a merged single gain spectrum was observed, indicating a coupled state between the two types of quantum dots.
Article
Chemistry, Physical
Mattia Salomone, Michele Re Fiorentin, Giancarlo Cicero, Francesca Risplendi
Summary: The study analyzes the stability and electronic properties of an InSe monolayer with point defects, showing the presence of deep defect states within the band gap. It predicts that Ge as a substitution impurity of Se could be a promising material for single-photon emitters due to its optical properties and strongly peaked spectrum in the near-infrared.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
Lei Wang, Zixian Wei, Chien-Ju Chen, Lai Wang, H. Y. Fu, Li Zhang, Kai-Chia Chen, Meng-Chyi Wu, Yuhan Dong, Zhibiao Hao, Yi Luo
Summary: This study introduces a blue micro-LED with a nano-structured InGaN wetting layer for high-speed VLC systems, achieving an optical-electrical bandwidth up to 1.3 GHz. Experimental results demonstrate data rates of 2 Gbps and improved 4 Gbps using this micro-LED.
PHOTONICS RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Sidney A. Lourenco, Larissa S. Figueredo, Marco Aurelio T. da Silva, Ricardo Fernandes
Summary: Solution-processed PbS quantum dots embedded into organic-inorganic lead hybrid halide perovskites were synthesized and analyzed. The study showed the presence of both orthorhombic and tetragonal phases in the films at 10K and 77K, while only the tetragonal phase was observed at 300K. The size of the perovskite grains was found to decrease with increasing PbS quantum dots concentration, indicating an effect on perovskite nucleation.
Article
Optics
Rayhani Jawher, Mehrez Oueslati, Vincent Sallet, Jean-Christophe Harmand, Radhwen Chtourou
Summary: Temperature-dependent photoluminescence measurements were performed on self-assembled InAs quantum dots grown by molecular beam epitaxy. Non-monotonic evolutions of the PL spectral parameters as a function of temperature were observed in the low-temperature regime. The anomalous increase in the integrated intensity and sigmoidal variation of the PL peak energy with increasing temperature were attributed to the optical emission from deep states in the quantum dots. A rate equation model successfully described the evolution of the integrated PL intensity with temperature, providing insight into the thermally activated intra-dot redistribution of carriers.
JOURNAL OF LUMINESCENCE
(2023)
Article
Materials Science, Ceramics
Azar Sadollahkhani, Omer Nur, Magnus Willander, Iraj Kazeminezhad, Volodymyr Khranovskyy, M. O. Eriksson, Rositsa Yakimova, Per-Olof Holtz
CERAMICS INTERNATIONAL
(2015)
Article
Crystallography
M. Lazarev, J. Szeszko, A. Rudra, K. F. Karlsson, E. Kapon
JOURNAL OF CRYSTAL GROWTH
(2015)
Article
Chemistry, Analytical
Dzmitry Sodzel, Volodymyr Khranovskyy, Valerio Beni, Anthony P. F. Turner, Roman Viter, Martin O. Eriksson, Per-Olof Holtz, Jean-Marc Janot, Mikhael Bechelany, Sebastien Balme, Valentyn Smyntyna, Ekaterina Kolesneva, Lyudmila Dubovskaya, Igor Volotovski, Arnolds Ubelis, Rositsa Yakimova
Article
Nanoscience & Nanotechnology
Tomas Jemsson, Houssaine Machhadani, Per-Olof Holtz, K. Fredrik Karlsson
Article
Physics, Multidisciplinary
K. F. Karlsson, D. Y. Oberli, M. A. Dupertuis, V. Troncale, M. Byszewski, E. Pelucchi, A. Rudra, P. O. Holtz, E. Kapon
NEW JOURNAL OF PHYSICS
(2015)
Article
Physics, Condensed Matter
Shuai Zhou, Yumin Liu, Donglin Wang, Zhongyuan Yu, Wei Zhao, Lifeng Le, Per Olof Holtz
SUPERLATTICES AND MICROSTRUCTURES
(2015)
Article
Crystallography
Takahide Hirasaki, Martin Eriksson, Quang Tu Thieu, Fredrik Karlsson, Hisashi Murakami, Yoshinao Kumagai, Bo Monemar, Per Olof Holtz, Akinori Koukitu
JOURNAL OF CRYSTAL GROWTH
(2016)
Article
Physics, Condensed Matter
N. Kamata, M. Suetsugu, D. Haque, S. Yagi, H. Yaguchi, F. Karlsson, P. O. Holtz
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2017)
Article
Multidisciplinary Sciences
Y. T. Chen, K. F. Karlsson, J. Birch, P. O. Holtz
SCIENTIFIC REPORTS
(2016)
Article
Chemistry, Multidisciplinary
Noor-Ul-Ain, Martin O. Eriksson, Susann Schmidt, M. Asghar, Pin-Cheng Lin, Per Olof Holtz, Mikael Syvajarvi, G. Reza Yazdi
Article
Nanoscience & Nanotechnology
M. O. Eriksson, S. Khromov, P. P. Paskov, X. Wang, A. Yoshikawa, P. O. Holtz, B. Monemar, V. Darakchieva
Editorial Material
Instruments & Instrumentation
L. Hoglund, S. D. Gunapala, E. Costard, Per-Olof Holtz
INFRARED PHYSICS & TECHNOLOGY
(2019)
Article
Physics, Applied
Son Phuong Le, Chih-Wei Hsu, Ivan Martinovic, Per-Olof Holtz
Summary: GaN-based pyramidal quantum structures with InGaN nanostructures on top were fabricated with high uniformity and precise interfaces, serving as building blocks for micro-emitters. Interconnected microLEDs on these structures exhibited well-defined electroluminescence in the near-ultraviolet regime with negligible spectral shifts at high currents, showcasing their potential for microLED applications.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Son Phuong Le, Chih-Wei Hsu, Ivan Martinovic, Ivan G. Ivanov, Per-Olof Holtz
Summary: GaN-based structures grown on SiC substrates using horizontal hot-wall metal-organic chemical vapor deposition (MOCVD) exhibit high crystal quality. Doping GaN with Mg and Si results in low-resistivity hole and electron transport, comparable to state-of-the-art GaN. High concentrations of free holes are achieved without thermal annealing due to the advantageous heating characteristics of the hot-wall reactor. Light-emitting diodes using doped GaN in the carrier-transport layers show high device performance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
