Article
Optics
Vladimir Pavlenko, Igor Beloussov
Summary: The dynamic and spectral characteristics of close-packed quantum dots excited by a -30 ps long laser pulse in a film prepared by a drop casting method from toluene solution were investigated. The wavelength of photoluminescence of single excitons and the wavelength of amplified spontaneous radiation associated with a stimulated decay of biexcitons were obtained. The dynamics of these two types of radiation were analyzed from the spectrogram of the time-resolved photoluminescence. It was found that the peak maximum of single excitons appears later than the maximum of amplified spontaneous radiation, and slowly narrows and diminishes over time. The amplified spontaneous radiation lasts for 200 ps.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Xuefeng Wang, Xiaoyu Zhao, Shuai Guo, Dieter Weller, Sufeng Quan, Mengxuan Wu, Wenjun Liu, Ruibin Liu
Summary: To date, evaluating the quality of MoS2 has been inefficient or caused irreversible damage to samples, limiting scalability and throughput. In this study, we propose a visualized and nondestructive approach using the PCA machine learning method to evaluate MoS2 quality. By applying PCA processing to PL mapping, we successfully distinguish CVD-grown MoS2 samples with different edge defect densities and identify six twin GBs in the MoS2 stars. The verification of identification results through lifetime mapping and thermal expansion coefficient measurements further supports the effectiveness of our approach in assessing MoS2 quality.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Xueyang Li, Jun Du, Guohui Zhao, Boyu Zhang, Clement Livache, Namyoung Ahn, Yuxi Jia, Mingrun Li, Ying Chen, Jingyi Zhu, Jingwei Guo, Victor I. Klimov, Kaifeng Wu
Summary: A new type of liquid optical-gain medium using compact compositionally-graded quantum dots has been demonstrated, showing broad-band optical gain and stable operation under intense photoexcitation. Two-color amplified spontaneous emission has been achieved using nanosecond pulses.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Applied
Hao Sun, Ming Li, Lei Shang, Lu Wang
Summary: This study constructs an efficient single benzene ring solid-state emitter by utilizing aggregation-induced emissions (AIE) and excited-state intramolecular proton transfer reaction (ESIPT), achieving high solid-state emission from polycrystalline states. While there are many reports of small molecules exhibiting amplification spontaneous emission laser properties, there are few reports of single benzene rings exhibiting laser properties.
Article
Chemistry, Multidisciplinary
Chunyue Xu, Tianrui Li, Jinling Miao, Kexin Liu, Yong Nie, Guangning Liu, Xuchuan Jiang
Summary: In this study, two bridged carborane-anthracene dyads with dual state emission (DSE) properties were reported. Compound 2 was obtained by reducing carboranyl Schiff base 9-anthracenylidene-1-amino-o-carborane (1) with NaBH4. The photophysical properties and mechanochromism of both compounds and their silica gel composites were investigated. This work provides a simple strategy for designing and synthesizing novel carborane-containing DSE compounds and regulating solid-state luminescence for potential applications.
NEW JOURNAL OF CHEMISTRY
(2023)
Review
Optics
Nannan Feng, Min Lu, Siqi Sun, Anqi Liu, Xiaomei Chai, Xue Bai, Junhua Hu, Yu Zhang
Summary: In recent years, practical engineering applications such as fiber-optic gyroscope, wavelength division multiplexing, and optical coherence tomography have put forward higher requirements on light sources due to the rapid development of military, optical communication, biological imaging, and other fields. Amplified spontaneous emission (ASE) light source has become an excellent candidate due to its advantages such as suitable bandwidth, low coherence, and high power. This review analyzes the principle of the ASE effect, summarizes the optical gain properties of various gain materials and different structural types of electrically pumped ASE devices, and prospects the development of new ASE light-emitting devices integrated with high-gain materials and low-cost structures.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Kun Tian, Yannan Lu, Ruqing Liu, Xian Jun Loh, David James Young
Summary: By utilizing a two-step solution protocol with minimal PEO, we successfully fabricated CsPbBr3 films with improved crystallinity, photoluminescence intensity, and lifetime, while lowering the ASE threshold. The addition of 0.3wt% PEO was subsequently almost fully removed, reducing its adverse impact on film stability under continuous pulsed laser excitation. Stable ASE spectra could be stimulated even after 10 months of storage in air.
Article
Chemistry, Multidisciplinary
Song Hu, Liangyu Hu, Xuefeng Zhu, Yuan Wang, Minghua Liu
Summary: In this study, symmetric and dissymmetric chiral V-shaped pyrenes were designed and their circular dichroism (CD) and circularly polarized excimer emission (CPEE) were investigated. Symmetric V-shaped molecules exhibited spacer-dependent CD and CPEE in molecular solution, while dissymmetric V-shaped molecules were silent in CD and CPEE. Additionally, the chiral V-shaped conformation guided a helical hexagonal packing upon self-assembly.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Yang Li, Hang Hu, Ahmed Farag, Thomas Feeney, Isabel Allegro, Uli Lemmer, Ulrich W. Paetzold, Ian A. Howard
Summary: Perovskite gain materials can sustain continuous-wave lasing at room temperature. However, electrical stimulation supplementing optical has reduced gain performance in the past. In this study, researchers found that the addition of an electric field can turn on/off the amplified spontaneous emission (ASE) in a CsPbBr3 perovskite light-emitting diode (LED), and a positive bias voltage leads to a reduction in the optical ASE threshold.
Article
Chemistry, Physical
Chunming Ji, Hao Jia, Chen Zhou, Quan Wang, Wei Xue
Summary: Investigated the impact of different coupling forms on the optoelectronic properties of two-dimensional materials. Found that burying silver nanowires beneath molybdenum disulfide can further enhance light utilization efficiency and significantly improve the photoresponsivity and light response speed.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Qi Wei, Ruihong Duan, Qi Zhang, Linghai Xie, Ruidong Xia, Yuanping Yi, Jeremie Leonard, Stefan Haacke, Juan Cabanillas-Gonzalez, Yan Qian, Wei Huang
Summary: By designing compounds with tunable electronic transition characters and studying their vibrational modes using computational calculations and experiments, this study provides guidelines for the rational design of efficient organic laser materials. The results show that the coupling of high wavenumber vibrational modes to pure LE states is essential for optical gain, while broad excited-state absorption overwhelming stimulated emission is favored when HLCT or CT states are coupled to low frequency vibrational modes.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Geetha Bolla, Qing Liao, Saeed Amirjalayer, Zeyi Tu, Shaokai Lv, Jie Liu, Shuai Zhang, Yonggang Zhen, Yuanping Yi, Xinfeng Liu, Hongbing Fu, Harald Fuchs, Huanli Dong, Zhaohui Wang, Wenping Hu
Summary: Through halogen-bonded cocrystallization, controllable molecular packing motifs can be achieved in organic semiconductors, leading to increased radiative decay rate and decreased ASE threshold. Cocrystallization is a powerful approach that is fundamentally important for the development of organic ASE and lasing materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Shiqi Sui, Jian Zhou, Aifei Wang, Guangcai Hu, Wen Meng, Chuying Wang, Yao Liu, Jiajing Wu, Zhengtao Deng
Summary: In this study, a 2D phenethylammonium tin-lead bromide perovskite was successfully synthesized using a simple solution-phase approach, allowing for control of bandgap behavior by tuning the ratio of tin and lead. Density functional theory calculations revealed the key effects of spin-orbital coupling, and a standard equation with a correction term was provided to introduce the influence of SOC. These findings advance bandgap engineering of perovskites and expand the application of 2D perovskite materials.
NANOSCALE ADVANCES
(2021)
Article
Multidisciplinary Sciences
Yongjun Lee, Johnathas D'arf Severo Forte, Andrey Chaves, Anshuman Kumar, Trang Thu Tran, Youngbum Kim, Shrawan Roy, Takashi Taniguchi, Kenji Watanabe, Alexey Chernikov, Joon I. Jang, Tony Low, Jeongyong Kim
Summary: The authors demonstrate that screening exciton-exciton interaction in monolayer WS2 using proximal metal plates can significantly enhance the quantum yield.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Weijian Tao, Chi Zhang, Qiaohui Zhou, Yida Zhao, Haiming Zhu
Summary: The nature of excitons in 2D CsPbBr3 perovskites was studied through static and time-resolved spectroscopy and rationalized with the Urbach-Martienssen rule. Quantitatively, an intermediate exciton-phonon coupling in 2D CsPbBr3 was demonstrated, showing that exciton polarons are momentarily self-trapped by lattice vibrations.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Nathan D. Burrows, Samantha Harvey, Fred A. Idesis, Catherine J. Murphy
Article
Chemistry, Physical
Samantha M. Harvey, Brian T. Phelan, Daniel C. Hannah, Kristen E. Brown, Ryan M. Young, Matthew S. Kirschner, Michael R. Wasielewski, Richard D. Schaller
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2018)
Article
Chemistry, Multidisciplinary
Alexandra Brumberg, Benjamin T. Diroll, Georgian Nedelcu, Matthew E. Sykes, Yuzi Liu, Samantha M. Harvey, Michael R. Wasielewski, Maksym V. Kovalenko, Richard D. Schaller
Article
Multidisciplinary Sciences
Matthew S. Kirschner, Benjamin T. Diroll, Peijun Guo, Samantha M. Haryey, Waleed Helweh, Nathan C. Flanders, Alexandra Brumberg, Nicolas E. Watkins, Ariel A. Leonard, Austin M. Evans, Michael R. Wasielewski, William R. Dichtel, Xiaoyi Zhang, Lin X. Chen, Richard D. Schaller
NATURE COMMUNICATIONS
(2019)
Article
Multidisciplinary Sciences
Michelle Chen, Matthew D. Krzyaniak, Jordan N. Nelson, Youn Jue Bae, Samantha M. Harvey, Richard D. Schaller, Ryan M. Young, Michael R. Wasielewski
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2019)
Article
Chemistry, Multidisciplinary
Alexandra Brumberg, Samantha M. Harvey, John P. Philbin, Benjamin T. Diroll, Byeongdu Lee, Scott A. Crooker, Michael R. Wasielewski, Eran Rabani, Richard D. Schaller
Article
Chemistry, Multidisciplinary
Abhijit Hazarika, Igor Fedin, Liang Hong, Jinglong Guo, Vishwas Srivastava, Wooje Cho, Igor Coropceanu, Joshua Portner, Benjamin T. Diroll, John P. Philbin, Eran Rabani, Robert Klie, Dmitri V. Talapin
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Multidisciplinary
Patrick D. Cunningham, Igor Coropceanu, Kavan Mulloy, Wooje Cho, Dmitri Talapin
Article
Chemistry, Physical
John P. Philbin, Alexandra Brumberg, Benjamin T. Diroll, Wooje Cho, Dmitri Talapin, Richard D. Schaller, Eran Rabani
JOURNAL OF CHEMICAL PHYSICS
(2020)
Article
Chemistry, Multidisciplinary
Jacob H. Olshansky, Samantha M. Harvey, Makenna L. Pennel, Matthew D. Krzyaniak, Richard D. Schaller, Michael R. Wasielewski
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Article
Chemistry, Multidisciplinary
Jia-Ahn Pan, Haoqi Wu, Anthony Gomez, Justin C. Ondry, Joshua Portner, Wooje Cho, Alex Hinkle, Di Wang, Dmitri V. Talapin
Summary: In this study, a direct optical patterning method for all-inorganic nanocrystals (NCs) without the use of additional photosensitive ligands or additives is introduced. The photo-oxidation of surface ions on ligand-stripped, bare NCs significantly reduces their solubility in polar solvents, enabling the patterning of various materials. Transparent NCs can still be patterned by mixing them with suitably absorbing NCs.
Article
Chemistry, Multidisciplinary
Wooje Cho, Zirui Zhou, Ruiming Lin, Justin C. Ondry, Dmitri Talapin
Summary: Group III nitrides are important materials for electronic devices and have been widely manufactured using high-temperature methods. Solution synthesis of III-nitride nanocrystals has been challenging, but this study shows that incorporating a molten salt phase can produce crystalline III-nitride nanomaterials. The use of molten salt and high-pressure reactants significantly expands the chemical scope of solution synthesis of inorganic nanomaterials.
Article
Multidisciplinary Sciences
Di Wang, Chenkun Zhou, Alexander S. Filatov, Wooje Cho, Francisco Lagunas, Mingzhan Wang, Suriyanarayanan Vaikuntanathan, Chong Liu, Robert F. Klie, Dmitri V. Talapin
Summary: Two-dimensional transition-metal carbides and nitrides (MXenes) are extensively studied materials with diverse applications in energy storage. We demonstrate a direct synthesis route for scalable and atom-economic production of MXenes, including previously unattainable compounds, by reactions of metals and metal halides with graphite, methane, or nitrogen. The directly synthesized MXenes exhibit excellent energy storage capacity for lithium-ion intercalation, and their growth can be controlled to form unique morphologies such as carpets and spherulites.