Article
Optics
Kazuhiro Kuruma, Hironobu Yoshimi, Yasutomo Ota, Ryota Katsumi, Masahiro Kakuda, Yasuhiko Arakawa, Satoshi Iwamoto
Summary: This study reports single-photon sources using single quantum dots embedded in topological slow light waveguides based on valley photonic crystals. The experiment demonstrates Purcell-enhanced single-photon emission in a topological slow light mode with a group index over 20, showing robust propagation even under sharp bends.
LASER & PHOTONICS REVIEWS
(2022)
Article
Chemistry, Analytical
Kai-Ling Liang, Wei-Hung Kuo, Chien-Chung Lin, Yen-Hsiang Fang
Summary: Colloidal CdSe/ZnS quantum dots (QD) enhanced micro-LEDs with sizes ranging from 10 to 100 μm were fabricated and characterized. The color conversion layer in the form of quantum-dot-contained photoresists was directly placed on top of an InGaN-based micro-LED using photolithography, demonstrating high throughput and precision. The QD-enhanced micro-LEDs exhibited higher brightness compared to AlGaInP counterparts under the same current level. Furthermore, these devices showed low redshift of emission wavelength and demonstrated efficient color stability and angular color match, making them promising for future micro-display technology.
Article
Chemistry, Multidisciplinary
Maxim Rakhlin, Grigorii Klimko, Sergey Sorokin, Marina Kulagina, Yurii Zadiranov, Dmitrii Kazanov, Tatiana Shubina, Sergey Ivanov, Alexey Toropov
Summary: This paper reports on single-photon emitters designed for the telecommunication O-band. These emitters consist of InAs/(In)GaAs quantum dots with asymmetric barriers placed inside semiconductor tapered nanocolumns acting as photonic nanoantennas. The implemented design allows for a shift in the quantum dot radiation wavelength towards the O-band, and the nanoantennas collect and effectively output the radiation. With non-resonant optical pumping, the average count rate of emitted single photons exceeds 10 MHz, with a second-order correlation function g((2))(0) = 0.18 at 8 K.
Article
Optics
Shan Xiao, Shiyao Wu, Xin Xie, Jingnan Yang, Wenqi Wei, Shushu Shi, Feilong Song, Jianchen Dang, Sibai Sun, Longlong Yang, Yunuan Wang, Sai Yan, Zhanchun Zuo, Ting Wang, Jianjun Zhang, Kuijuan Jin, Xiulai Xu
Summary: Chiral quantum optics has attracted interest in the field of quantum information science. By exploiting spin-polarization properties and engineering rational photonic nanostructures, information can be transformed in compact chiral photonic circuits with deterministic circularly polarized chiral routing and beamsplitting.
LASER & PHOTONICS REVIEWS
(2021)
Article
Chemistry, Multidisciplinary
Minho Choi, Mireu Lee, Sung-Yul L. Park, Byung Su Kim, Seongmoon Jun, Suk In Park, Jin Dong Song, Young-Ho Ko, Yong-Hoon Cho
Summary: In this study, a method is proposed to deterministically integrate single quantum dots with tailor-made photonic structures. A nondestructive luminescence picking method called nanoscale-focus pinspot (NFP) is used to reduce the luminous quantum dot density. The selected quantum dot is then deterministically integrated with a tailor-made photonic structure, leading to improved extraction efficiency.
ADVANCED MATERIALS
(2023)
Article
Physics, Applied
Elif Ozceri, Nahit Polat, Sinan Balci, Enver Tarhan
Summary: This study reports localized, stable, and bright room temperature photoluminescence (PL) emission from defects in WO3, showing single photon characteristics. The PL emission from the localized defect centers in WO3 at room temperature has been further enhanced more than 20 times by using plasmonic gold nanoparticles.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Xiaowen Zhang, Liya Zeng, Tong Sun, Xiaogang Xue, Bin Wei
Summary: In this study, high-quality carbon dots (CDs) with few defects, high carbonation, and good film morphology were successfully synthesized. The LEDs with CDs as the emissive layer showed superior emission performance, especially the ones with dual emissive layers. The mechanism of CD emission was attributed to the improved carrier balance and extended emission zone.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Arun Ashokan, Paul Mulvaney
Summary: Solution-phase spectroelectrochemistry was used to study electron injection into colloidal CdSe quantum dots in THF. The results showed reversible optical changes on a time-scale of minutes, with the injection of electrons leading to quenching of photoluminescence. The number of electrons injected into the QDs depended on the electrode potential and QD size, with most injection occurring below the band edge.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Analytical
Suyu Lin, Suiting Zheng, Hao Wu, Ziheng Zhang, Xinyuan Xie, Peihui Yang, Yu Huang, Fengyu Li
Summary: Electrochemiluminescence (ECL) has high sensitivity and specificity, but the lack of sufficient luminescent reagents limits its use in complex systems or multi-analyte detections. This study enhanced the selectivity and discrimination of ECL detection by using multi-stopband photonic crystals (PCs) to improve assigned ECL. The PC electrode achieved accurate qualitative and quantitative analysis of 10 antibiotics with 100% accuracy and a LOD of 0.44 μM in PBS buffer and human serum. The designed PC luminescence amplifications improved the selectivity of ECL detection for multi-analytes.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Jeong Min Kim, Jae Min Bak, Bogyu Lim, Yu Jin Jung, Byong Chon Park, Min Ji Park, Jong Mok Park, Hyung-il Lee, Seo-Hyun Jung
Summary: A new concept for anti-counterfeiting security films that utilize the humidity from human breath to reveal a QR code on color-tunable one-dimensional (1D) PC films is presented. These films exhibit remarkable color transitions in a high humidity environment and can be used for anti-counterfeiting purposes and information storage.
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
Physics, Applied
Raj Kumar Khan, Pratibha Ramarao
Summary: Optimizing strategies for blue phase liquid crystals directly impact device performance, with recent use of colloidal nanoparticle assemblies enhancing the BP ranges, widening the applications of BPs as photonic materials.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Cara E. Bradsher, Cayla D. Ontko, Alexandra C. Koziel, James R. McBride, Sandra J. Rosenthal
Summary: This research has found that ferroelectric behavior can be achieved in nanoparticles through ion exchange, with fluorescence retention achieved through CdS shelling before ion exchange, containing defects in the CdS shell rather than the fluorescent CdSe cores. The ferroelectric response remains constant with an increase in the number of CdS monolayers, while fluorescence retention also increases, reaching 99% at 8 monolayers, allowing for the addition of ferroelectric applications to the growing list of quantum dot applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Liwei Dai, Christian Strelow, Tobias Kipp, Alf Mews, Iris Benkenstein, Dirk Eifler, Thanh Huyen Vuong, Jabor Rabeah, James McGettrick, Rostyslav Lesyuk, Christian Klinke
Summary: This study presents the successful direct doping of Mn2+ ions into ZnS nanoplatelets using a nucleation-doping strategy, resulting in Mn luminescence in ZnS:Mn NPLs. Energy transfer from ZnS NPLs to Mn2+ ions was observed, and the impact of Mn concentration on optical properties was systematically investigated. Tunable Mn emission and enhanced PL quantum yield in ZnS:Mn NPLs were achieved by passivating surface trap states. The synthetic strategy introduced here opens up new possibilities for further doped systems of two-dimensional NPLs.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Zheming Liu, Roberta Pascazio, Luca Goldoni, Daniela Maggioni, Dongxu Zhu, Yurii P. P. Ivanov, Giorgio Divitini, Jordi Llusar Camarelles, Houman Bahmani Jalali, Ivan Infante, Luca De Trizio, Liberato Manna
Summary: We successfully synthesized colloidal InAs nanocrystals (NCs) using amino-As and ligands different from the commonly employed oleylamine (OA). The combination of TOA and OA allowed for good control over the size distribution of the InAs NCs, with a volume ratio of 4:1 generating InAs tetrapods with arm lengths of 5-6 nm. These NCs are entirely zinc-blende and have a narrow excitonic peak at 950 nm in absorption. The use of mixtures of ligands improves control over the size and size distribution of InAs NCs.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)