Article
Nanoscience & Nanotechnology
Ge Mu, Tianyu Rao, Shuo Zhang, Chong Wen, Menglu Chen, Qun Hao, Xin Tang
Summary: This study reports colloidal quantum-dot upconverters with unprecedented performance, achieving a wider range of operation spectral and higher efficiency through optimization of device structure.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Mingyuan Xie, Jie Guo, Xiaoyu Zhang, Chenghao Bi, Lin Zhang, Zema Chu, Weitao Zheng, Jingbi You, Jianjun Tian
Summary: This study presents a solution to achieve high-efficiency pure-red perovskite light-emitting diodes (PeLEDs) by stabilizing the structure of quantum dots and reducing adverse effects. The use of composite ligands helped stabilize the strong-confined quantum dots and suppress Auger recombination in the devices. Additionally, adjustments in the valence band of the quantum dots improved charge injection balance in the PeLEDs.
Article
Optics
Mingshuang Guan, Yixi Wu, Zhaojing Kuang, Shiqing Xu, Junjie Zhang
Summary: This study successfully synthesized CsPbClxBr3-x PQD glass with excellent stability and improved the PL performance of cyan emission PQDs through excessive halogen doping. The introduction of CsPbCl2Br1 PQD glass fills the cyan gap in white LEDs and achieves a high color rendering index and color gamut area.
Article
Chemistry, Multidisciplinary
Peili Gao, Zinan Chen, Shuming Chen
Summary: This study investigates the degradation mechanism of blue quantum-dot light-emitting diodes (B-QLEDs) and reveals the accumulation of electrons in the quantum-dots (QDs) as the main cause of device degradation. The accumulated electrons induce the detachment of ligands and degrade the hole transport layer (HTL), while surface defects and HTL decomposition also contribute to B-QLEDs' stability.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Physical
Taesoo Lee, Minhyung Lee, Hansol Seo, Minjun Kim, Beomsoo Chun, Jeonghun Kwak
Summary: This review summarizes previous studies on top-emitting device structures and discusses ways to improve the performance of top-emitting quantum dot-based light-emitting diodes (TQLEDs). The relevant theories for the optoelectrical properties of TQLEDs are introduced, and advancements in device optimization are presented. Multilateral strategies for TQLEDs to be widely applied in advanced industries are also discussed. This review aims to provide valuable insights for realizing commercial TQLEDs applicable to a broad range of applications.
Article
Chemistry, Multidisciplinary
Le Yang, Xian Wei Chua, Zhihong Yang, Xiangpeng Ding, Yong Yu, Ady Suwardi, Meng Zhao, Karen Lin Ke, Bruno Ehrler, Dawei Di
Summary: In the quest for deployable high-energy organic light-emitting diodes, this research suggests focusing on fluorescent emitters and developing design strategies to improve their efficiencies. The study demonstrates the potential of DPBF as a photon upconverter and a bright emitter for OLEDs. Additionally, DPBF's decent hole mobilities make it suitable for other printable electronics applications.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Multidisciplinary
Yan Li, Can Liu, Yulong An, Menglin Chen, Yunwu Zheng, Hao Tian, Rui Shi, Xiahong He, Xu Lin
Summary: Multicolor luminescent carbon dots were prepared by a solvothermal method using tannic acid and phthalaldehyde as carbon sources. The distinct optical features of these carbon dots are based on differences in the sizes of sp(2) domains, which can be governed by the structure of phthalaldehyde.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Engineering, Environmental
Zhiwen Yang, Gongli Lin, Jieyu Bai, Lechen Li, Yangbin Zhu, Liangrui He, Zhao Jiang, Weijie Wu, Xujiang Yu, Fushan Li, Wanwan Li
Summary: This research presents an efficient method for preparing high color purity inkjet-printed QLEDs using blue InP quantum dots as the emitting layer. The method involves optimizing the core size and shell thickness to achieve high PL quantum yield and suppress energy transfer, which can facilitate the development of large-area electroluminescent full-color displays.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Jing Chen, Qianqian Huang, Wei Lei
Summary: We report on a green, dual emissive quantum-dot light-emitting diode (QLED) using alumina-doped zinc oxide (AZO) to adjust the band offset between the cathode and QD-emitting layers, enhancing hole injection and slowing down electron injection from AZO to QD.
Article
Nanoscience & Nanotechnology
Ting Wang, Zhijie Chen, Huimin Zhang, Wenyu Ji
Summary: The study presents a novel structure to construct a real AC quantum dot light-emitting device that can achieve simultaneous electroluminescence of each pixel. By employing a bilayer emissive layer composed of red and green quantum dots, the emission color of the AC QLED can be tuned by both the polarity and amplitude of the driving voltage.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Yun Tang, Ben Liu, Nan Yan, Xiaoqiang He, Hudie Yuan, Yalou Xin, Hongfeng Yin
Summary: In this study, red-emitting MAPbBr(3-x)I(x) QDs-coated YAG:Ce (A-YAG@QDs) composites were successfully prepared to fabricate WLED with compensated red emission. The dispersion and sinking-related issues between QDs and YAG:Ce were effectively avoided through chemical coordination interactions. The resulting WLED exhibited warm white light with low CCT, high Ra, and high value of saturated red color component R9, making it suitable for indoor lighting applications.
Article
Chemistry, Multidisciplinary
Yu Fu, Swapnadeep Poddar, Beitao Ren, Ying Xie, Qianpeng Zhang, Daquan Zhang, Bryan Cao, Yunqi Tang, Yucheng Ding, Xiao Qiu, Lei Shu, Jin-Feng Liao, Dai-Bin Kuang, Zhiyong Fan
Summary: Color tunability of perovskite light-emitting diodes (PeLEDs) by mixed halide compositional engineering is achieved through strongly quantum-confined perovskite nanowires. The work successfully demonstrates the fabrication of color-tunable PeLEDs, particularly blue PeLEDs.
Article
Chemistry, Physical
Fengshou Tian, Cuixia Yuan, Shuming Chen
Summary: This work investigates the light-matter interaction and outcoupling efficiency of quantum dot light-emitting diodes with different structures. The results show that top-emitting devices have higher external quantum efficiency and stronger light-matter interaction and outcoupling efficiency. In addition, the enhancement of quantum yield induced by light-matter interaction is more significant for low-QY quantum dots.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Fengshou Tian, Cuixia Yuan, Shuming Chen
Summary: This study investigates the light-matter interaction and outcoupling efficiency of quantum dot light-emitting diodes with different structures, both experimentally and theoretically. The results show that the top-emitting devices have higher external quantum efficiency due to stronger light-matter interaction and higher light outcoupling efficiency. Additionally, the enhancement of emission quantum yield induced by light-matter interaction is more significant for low-QY quantum dots.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
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
Chemistry, Physical
Ben Tadgell, Ekaterina Ponomareva, Matthias Karg, Paul Mulvaney
Summary: The collapse dynamics of gold-poly(N-isopropylacrylamide) core-shell microgels were studied using capacitor-discharge temperature-jump spectroscopy. The results showed that the collapse process consists of a fast component and a slow component. The fast component corresponds to the rapid contraction of the loosely cross-linked outer corona of the microgels, while the slow component involves the subsequent rearrangement of the polymer chains. The lifetime of the fast component scales linearly with the change in microgel radius, while the lifetime of the slow component remains constant. The relative contribution of the slow component to the overall change in optical density is largest when the initial and final states are closer to the fully collapsed state of the microgels.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Camino Martin-Sanchez, Ana Sanchez-Iglesias, Paul Mulvaney, Luis M. Liz-Marzan, Fernando Rodriguez
Summary: The effects of nonhydrostatic pressure on the morphology and stability of gold nanorods and nanospheres were studied. It was found that solvent solidification had a negligible effect on nanospheres, while nanorods were broken into smaller particles under nonhydrostatic conditions. However, colloidal stability was maintained in all cases.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Ekaterina Ponomareva, Ben Tadgell, Marco Hildebrandt, Marcel Kruesmann, Sylvain Prevost, Paul Mulvaney, Matthias Karg
Summary: The study focuses on the internal structure and light scattering intensity changes of core-shell microgels, analyzing them using small-angle X-ray scattering and small-angle neutron scattering data. The research discusses the relationship between structural changes during collapse/swelling and polymer volume fractions by matching findings with temperature-dependent absorbance measurements.
Article
Optics
Moritz B. Heindl, Nicholas Kirkwood, Tobias Lauster, Julia A. Lang, Markus Retsch, Paul Mulvaney, Georg Herink
Summary: The study utilizes the quantum-confined Stark-effect to encode ultrafast electric near-fields into colloidal quantum dot luminescence and introduces a new microscopic imaging method called Quantum-probe Field Microscopy (QFIM). This approach allows for spatial and temporal resolution of Terahertz resonance and waveguide excitations in the sub-wavelength regime, providing a direct route towards ultrafast field imaging of complex nanodevices.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Editorial Material
Chemistry, Multidisciplinary
Paul Mulvaney, Jillian M. Buriak, Xiaodong Chen, Tony Hu, Jill E. Millstone, Molly Stevens
Article
Chemistry, Multidisciplinary
Arun Ashokan, Jiho Han, James A. Hutchison, Paul Mulvaney
Summary: We report an unexpected enhancement of photoluminescence (PL) in CdSe-based core/shell nanoplatelets (NPLs) upon electrochemical hole injection. Moderate hole doping densities induce an enhancement of more than 50% in PL intensity, accompanied by a narrowing and blue-shift of the PL spectrum. The hole-induced PL brightening in NPLs contrasts with the typical observation of PL quenching in CdSe-based quantum dots following hole injection. We propose that hole injection removes surface traps responsible for negative trions formation, thereby blocking nonradiative Auger processes. Continuous photoexcitation causes the enhanced PL intensity to decrease back to its initial level, indicating that photocharging is a key step in the loss of PL luminescence during normal aging. Modulation of the potential can be used for reversible enhancement or quenching of PL, enabling electro-optical switching.
Article
Chemistry, Physical
Na Wu, Nicholas Kirkwood, Nicolau Saker Neto, Rehana Pervin, Paul Mulvaney, Wallace W. H. Wong
Summary: To understand the factors controlling energy transfer from QDs to dyes, a series of CdxZn1-xS/ZnS QD-PDI composite nanocrystals were fabricated. The maximum energy transfer efficiency of 91% was achieved with composites containing carboxylic acid anchoring groups and longer alkyl chains. Composites with carboxylic acid anchors exhibited greater photostability compared to those with amine anchors.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Shifan Wang, Arun Ashokan, Sivacarendran Balendhran, Wei Yan, Brett C. Johnson, Alberto Peruzzo, Kenneth B. Crozier, Paul Mulvaney, James Bullock
Summary: In this study, a bias-selectable dual-band IR detector operating at room temperature was demonstrated using lead sulfide colloidal quantum dots and black phosphorus nanosheets. By switching between zero and forward bias, the peak photosensitive range of the detector can be switched between the mid- and short-wave IR bands, with room temperature detectivities of 5 x 10(9) and 1.6 x 10(11) cm Hz(1/2) W-1, respectively. These are the highest reported room temperature values for low-dimensional material dual-band IR detectors to date.
Article
Chemistry, Physical
Zifei Chen, Anjay Manian, Yihan Dong, Salvy P. Russo, Paul Mulvaney
Summary: The absorption spectra of congenetic WZ and ZB CdS magic-sized clusters are studied. Exciton peak positions can be tuned by varying the coupling between X-type ligands and semiconductor cores, while midgap states are affected by L-type ligands. Red shifts in absorption spectra are observed when Z-type ligands are replaced by L-type ligands, despite a small decrease in cluster size. Density functional theory calculations explain these findings and highlight the importance of Cd and S dangling bonds during ligand exchange. ZB CdS clusters are more chemically stable but show greater sensitivity to solvents, while WZ CdS clusters exhibit various spectral changes in a Lewis base-rich environment. These findings enable researchers to selectively modulate the optical properties of semiconductor clusters while controlling their solvent interactions.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Zifei Chen, J. Curtis Beimborn, Nicholas Kirkwood, Salvy P. Russo, J. Mathias Weber, Paul Mulvaney
Summary: The size-dependent pressure response of oleate-stabilized CdSe quantum dots in paraffin was investigated using diamond anvil cell experiments and density functional theory (DFT). The photoluminescence shows a blue-shift of around 43 meV/GPa for QDs above 3.0 nm, but the shift increases strongly for nanocrystals less than 3 nm in size. Conversely, the absorption shift is 45 meV/GPa above 3.0 nm but weakens to 35 meV/GPa for particles 1.5 nm in size. No crystallographic phase transitions occur below 2 GPa, and the optical effects are reversible. DFT calculations confirm that shifts in the bulk modulus begin for sizes estimated to be 1/2 of the Bohr radius, which we term the extreme confinement regime.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Dingchen Wen, Nicholas Kirkwood, Paul Mulvaney
Summary: This study reports a new low temperature, solution-based synthetic route to colloidal InN nanocrystals with tunable photoluminescence. These nanocrystals are phase-pure wurtzite InN and can be used as key materials in NIR LEDs, photodetectors, and multijunction solar cells.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Jialu Li, Ash Dyer, Dan Smith, Paul Mulvaney
Summary: This study fabricates nanodrum resonators using nanometer-thick gold films as the drumheads and investigates their natural vibrations and mass sensitivity, finding that they can achieve high Q factors under specific conditions.
Article
Chemistry, Multidisciplinary
Gangcheng Yuan, Heather F. Higginbotham, Jiho Han, Anchal Yadav, Nicholas Kirkwood, Paul Mulvaney, Toby D. M. Bell, Jared H. Cole, Alison M. Funston
Summary: This study investigates the photoluminescence anisotropy of CdSe semiconductor nanocrystals experimentally and theoretically. By visualizing emission dipole orientation using defocused wide-field microscopy, it is found that different shaped nanocrystals exhibit different optical properties. The differences in defocused emission patterns of rods and long nanoplatelets are explained by considering valence band structures calculated using multiband effective mass theory and the dielectric effect.
Article
Chemistry, Multidisciplinary
Zifei Chen, Arun Ashokan, Salvy P. Russo, Paul Mulvaney
Summary: A non-empirical equation for describing the temperature dependence of the optical bandgap of CdS, based on the Brus equation, reveals that the value of dE(g)/dT differs significantly from bulk values only within the extreme confinement (EC) regime. Both experimental and theoretical investigations of absorption spectra of CdS clusters and quantum dots show that dE(g)/dT in the EC regime is 2.5 times higher than in the strong confinement regime. Ligand sensitivities are also observed for dE(g)/dT in the case of CdS clusters. Ab initio molecular dynamics simulations and density functional theory calculations highlight thermal fluctuations as the crucial factor influencing the bandgap temperature coefficient.
Article
Physics, Fluids & Plasmas
Roberto N. Munoz, Laszlo Frazer, Gangcheng Yuan, Paul Mulvaney, Felix A. Pollock, Kavan Modi
Summary: It has been discovered that blinking quantum dots exhibit nontrivial memory, which cannot be detected using standard data analysis methods. This memory can be explained by various physical mechanisms such as chemical structure, intensity levels, and photon statistics.
Review
Chemistry, Multidisciplinary
Dan He, Yawen Li, Fuwen Zhao, Yuze Lin
Summary: High trap density in organic solar cells leads to localized charge carriers and reduced carrier lifetime, limiting device efficiency. This feature article summarizes the recent advances of trap suppression by material design and device engineering.
CHEMICAL COMMUNICATIONS
(2024)
Review
Chemistry, Multidisciplinary
Olivier Monfort, Arshitha Madhusudhan, Martin Motola
Summary: This article presents the advantages of coupling photocatalysis and Fenton-based processes for environmental remediation and discusses their synergy. It critically examines the simultaneous triggering of these two processes and provides insights into research approaches. The study aims to enhance understanding of this complex process and highlight the potential integration of new catalysts in current wastewater treatment technology.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Manideepa Dhar, Chittaranjan Mishra, Avijit Das, Uttam Manna
Summary: An approach of 'polymerization of monomers in its aggregated form' has been introduced to tailor the water wettability of fibrous and porous substrates, achieving hydrophobicity to superhydrophobicity transition, as well as patterned wettability. This facile chemical method provides a durable coating with adjustable and patterned wettability for various potential applications.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Saswat Ranjan Bhoi, Chhanda Debnath, Shikha Gandhi
Summary: In this article, a novel catalytic reaction using Pd(0) and Bronsted acid is reported for the synthesis of biologically important imidazolidinone-fused N-heterocycles through redox-neutral intramolecular N-allylation of indoles and pyrroles with alkynes. This atom-economical method is applicable to a wide range of substrates and eliminates the need for leaving groups or oxidizing agents commonly used in traditional allylation reactions.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Longkun Chen, Mingshuai Zhang, Meichen Liu, Zhuoyuan Liu, Yuetong Qiu, Zhilai Zhang, Fuchao Yu, Jiuzhong Huang
Summary: In this study, an efficient Rh(III)-catalyzed selective mono- and dual-C-H bond functionalization/cyclization with iodonium ylide as the sole coupling partner was demonstrated. Fused benzodiazepine skeletons were obtained in excellent yields, providing an improved approach to dual C-H unsymmetrical functionalization.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Alice Kennett, Sven Epple, Gabriella van der Valk, Irene Georgiou, Evelyne Gout, Romain R. Vives, Angela J. Russell
Summary: This study presents the design and synthesis of sulfated disaccharide inhibitors based on IdoA(2S)-GlcNS(6S), which showed potent inhibition of Sulf-2. The results suggest that IdoA(2S)-GlcNS(6S) is the shortest fragment size required for effective inhibition of Sulfs, and a trisulfated disaccharide is identified as the minimal fragment size of heparan sulfate for effective endosulfatase inhibition.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Mauro Garbini, Andrea Brunetti, Riccardo Pedrazzani, Magda Monari, Massimo Marcaccio, Giulio Bertuzzi, Marco Bandini
Summary: The self-adaptability of galvanostatic electrolysis was found to be helpful in a multistage chemo- and diastereoselective electrochemically promoted cyclodimerization of chalcones. Through a series of reductive events, densely functionalized cyclopentanes with five contiguous stereocenters were obtained (25 examples, yields up to 95%, dr values up to >20:1). Further experimental and electrochemical investigations indicated the crucial role of dynamic kinetic resolution of the aldol intermediate in the reaction mechanism.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Dhananjay S. Nipate, Neha Meena, Prakash N. Swami, Krishnan Rangan, Anil Kumar
Summary: In this study, the synthesis of functionalized benzo[a]phenazines and indazolo[2,3-a]quinolines was achieved through Rh(III)-catalyzed oxidative annulation of 2-arylquinoxalines and 2-aryl-2H-indazoles with allyl alcohols. The method showed a wide substrate scope, excellent functional group tolerance, good to high yields of annulated products, and the capability for scaled-up synthesis. A tentative mechanism of the annulation reaction was proposed based on a preliminary mechanistic investigation.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Ruonan Zhang, Abudukadi Tudi, Xia Yang, Xuping Wang, Zhihua Yang, Shujuan Han, Shilie Pan
Summary: A new lead tellurium borate material with a unique fundamental building block [B4O10] was synthesized and found to exhibit high birefringence. The structure-property relationship was discussed using first-principles calculations.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Amresh Kumar Singh, Baishali Thakurta, Anupam Giri, Monalisa Pal
Summary: This study introduces three key concepts for the quick synthesis of large-scale high-quality 2D materials films and their utilization in device fabrication.
CHEMICAL COMMUNICATIONS
(2024)
Article
Chemistry, Multidisciplinary
Reina Hagiwara, Shun Nishimura, Kosuke Okeyoshi
Summary: A copolymer-conjugated nanocatalytic system has been developed to improve electron transfer and enhance photoinduced H2 generation.
CHEMICAL COMMUNICATIONS
(2024)
