Article
Chemistry, Multidisciplinary
Ruijing Fu, Wenya Zhao, Lingrui Wang, Zhiwei Ma, Guanjun Xiao, Bo Zou
Summary: By high-pressure processing, emission enhancement and non-doping control of color temperature can be achieved in two-dimensional perovskite nanocrystals.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Jingzhi Shang, Lishu Wu, Shun Feng, Yu Chen, Hongbo Zhang, Chunxiao Cong, Wei Huang, Ting Yu
Summary: This study demonstrates a new method for photon applications using resonant emission by using a white-light-emitting diode under simulated solar illumination. By embedding a 2D gain medium into a microcavity on a silicon wafer, white-light or solar-powered photon circuits can be achieved at the chip scale.
ADVANCED MATERIALS
(2022)
Review
Optics
Jianyu Zhang, Xueqian Zhao, Hanchen Shen, Jacky W. Y. Lam, Haoke Zhang, Ben Zhong Tang
Summary: This article reviews the strategies for achieving efficient white-light emission from pure organic aggregates, including single-component and multicomponent strategies. It introduces the single-component strategy from four aspects and summarizes doping, supramolecular assembly, and cocrystallization as strategies for multicomponent systems. The advanced applications of white-light emitters are also discussed.
ADVANCED PHOTONICS
(2022)
Article
Chemistry, Multidisciplinary
Sagnik Das, Uttam K. Ghorai, Rajib Dey, Chandan K. Ghosh, Mrinal Pal
Summary: This study reports the achievement of highly reproducible, stable, and intense white phosphorescence from phase-pure zinc oxide nanopowder synthesized by a simple, low temperature process. The white light emission has appreciable quantum yield and cool/near cool correlated color temperature, making it suitable for W-LED applications. The presence of zinc interstitial and oxygen interstitial defects responsible for the white phosphorescence was confirmed, and a defect chemistry-based thermodynamic interpretation was proposed to explain the white emission adequately.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Yan Zhu, Yan Guan, Yuan Deng, Yifan Niu, Chaofan Ren, Chunye Long, Qiong Su, Ping Wang
Summary: In this study, two copolymers with different feeding ratios of carbazole-dibenzofuran, 4-bromo-1,8-naphthalimide, and N-iso-propylacrylamide were synthesized. The copolymers exhibited dual-mode white light emissions, including warm white afterglows and standard white afterglows. The introduction of fluorine (F) atoms into the polymer films improved the afterglow performance.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Bo Chu, Haoke Zhang, Kailuo Chen, Bin Liu, Qing-Lei Yu, Cheng-Jian Zhang, Jingzhi Sun, Qing Yang, Xing-Hong Zhang, Ben Zhong Tang
Summary: This paper reports the first example of linear nonconjugated polyesters with single-molecule white-light emission (SMWLE), achieved by adjusting the balance of structural flexibility and rigidity and altering the chemical structures of the monomer. Furthermore, the hierarchical structures of clusteroluminogens (CLgens) were manipulated to achieve pure SMWLE.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Ethan J. Crace, Alexander C. Su, Hemamala Karunadasa
Summary: Recent observation of broadband white-light emission from certain layered lead-bromide perovskites has led to extensive studies on this phenomenon. Adding bromine to Pb-Cl perovskites appears to be a simple and general strategy for obtaining white light at room temperature from (001) perovskites, which can greatly expand the number of white-light-emitting layered perovskites.
Article
Multidisciplinary Sciences
Jianyu Zhang, Parvej Alam, Siwei Zhang, Hanchen Shen, Lianrui Hu, Herman H. Y. Sung, Ian D. Williams, Jianwei Sun, Jacky W. Y. Lam, Haoke Zhang, Ben Zhong Tang
Summary: Researchers have designed clusteroluminogens that exhibit multiple emissions and white-light emission in the crystalline state by manipulating through-space interactions. The intensity ratio of these emissions can be easily controlled by changing the halide atom and excitation wavelength.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yuchen Li, Qijun Li, Shuai Meng, Yukun Qin, Dengke Cheng, Hailing Gu, Zifei Wang, Yunxia Ye, Jing Tan
Summary: Ultra-broadband fluorescence/phosphorescence dual-emitting carbon dots (UB-CD@BA) are prepared by thermal treatment of boric acid (BA) and CDs with large conjugated structure, showing high phosphorescence quantum yield. The prepared UB-CD@BA powders exhibit bright pure white light emission with CIE coordinates of (0.32,0.33) and the highest reported full width at half maximum of 250 nm. Based on the unique characteristics of UB-CD@BA, it is used as a color conversion layer to prepare a WLED with CIE coordinates of (0.35, 0.33) and the CRI value of 87.
CHINESE CHEMICAL LETTERS
(2023)
Review
Chemistry, Inorganic & Nuclear
Nan-Chieh Chiu, Kyle T. Smith, Kyriakos C. Stylianou
Summary: Display technology has developed rapidly, and WOLEDs are one of the most promising materials. However, their low stability under atmospheric conditions and susceptibility to burn-in of images are critical challenges. Metal-organic frameworks (MOFs) are extensively studied for WOLED applications due to their structural diversity and high stability.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Multidisciplinary
Hong Gao, Miaomiao Wang, Yifan Mao, Qingsong Zhao, Cheng Zhang, Ling Jin, Youyi Xia, Weijin Li, Kui Zhang, Haibo Zeng
Summary: Currently available encapsulating materials for WLEDs have limitations, but this study developed promising materials with two significant advantages: direct encapsulation without phosphors and reprocessing for recycling. Blue-light-emitting vitrimers (BEVs) were prepared by reacting epoxy resin with amines, showing strong blue emission and fast stress relaxation. To achieve white-light emission, a well-designed yellow component was grafted into the BEVs, resulting in white-light-emitting vitrimers (WEVs). Using WEV as an encapsulating adhesive, stable white light with CIE coordinates (0.30, 0.32) was successfully achieved for 365nm LED chips without inorganic phosphors, indicating a promising future for WLED encapsulation.
ADVANCED MATERIALS
(2023)
Article
Engineering, Environmental
Ting Zhang, Yanan Wu, Xiang Ma
Summary: Research on amorphous pure organic room-temperature phosphorescent materials with dual-emissive properties has led to the development of color-tunable RTP emission, including white-light emission, under different feeding ratios and excitation wavelengths. Additionally, time-dependent multicolor afterglow, including nearly white afterglow, can be observed. The RTP emission of the water-soluble acrylamide copolymers can be quenched by water, resulting in tunable emission colors under different humidity conditions.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Wei Zhang, Wei Zheng, Lingyun Li, Ping Huang, Zhongliang Gong, Ziwei Zhou, Jinyue Sun, Yan Yu, Xueyuan Chen
Summary: In this study, a new class of highly efficient and dual-band-tunable white-light emitters based on Bi3+/Te4+ co-doped perovskite derivative Cs2SnCl6 microcrystals was reported. The microcrystals exhibited broad dual-band white-light emission originating from the inter-configurational transitions of Bi3+ and Te4+, with good stability and a high photoluminescence quantum yield.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Wenjing Li, Min Wu, Hang Jiang, Longhui Yang, Chao Liu, Xiao Gong
Summary: This study presents a facile synthetic approach to prepare environmentally friendly white fluorescent carbon dots/ZnO quantum dots composites through electrostatic force, which can be used for fabrication of high-performance white light-emitting diodes. The fluorescence emission spectra of the WLED devices cover a range from 425 nm to 750 nm, with a CIE chromaticity coordinate of (0.30, 0.34) and a color temperature of 7093 K.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Menglin Chen, Can Liu, Yulong An, Yan Li, Yunwu Zheng, Hao Tian, Rui Shi, Xiahong He, Xu Lin
Summary: Red, green, and blue CDs were successfully prepared using gallic acid as the raw material through a solvothermal method. The distinct optical features of these CDs are determined by the differences in the size of their sp(2)-domains, which can be controlled by reaction solvents.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Swayam Prakash, Saugata Sahu, Shubhayan Bhattacharya, Prem B. Bisht, Ashok Kumar Mishra
Summary: Phosphor materials with broad spectral range and an average emission lifetime have been achieved from carbon dots-NaCl crystals, with fructose as the precursor showing the most intense emission. Utilizing ripe banana peel as the precursor, white-light emission with specific CIE index has been achieved from the single source of CDs-NaCl crystals, which also function as Fabry-Perot resonators for lasing with low laser threshold value and high Q-factor. This approach offers a new method for F-P lasing and white light emission from a non-toxic green source with a quick and low-cost synthesis procedure.
CHEMISTRY-AN ASIAN JOURNAL
(2021)
Article
Environmental Sciences
Swayam Prakash, Suraj Kumar Panigrahi, Rebecca Paulina Dorner, Martin Wagner, Wido Schmidt, Ashok Kumar Mishra
Summary: A detailed photophysical study was conducted on two faecal pigments (UB and SB) and their zinc complexes, revealing that the fluorescence of UB and SB can be enhanced by the formation of Zn(II) complexes. The physicochemical environments play a significant role in influencing the fluorescence behavior of the Zn(II) complexes. Molecular orbital calculations provided insights into the geometry of the complexes and rationalized the fluorescence enhancement after complexation.
Article
Chemistry, Multidisciplinary
Saugata Sahu, Pulak Karan, Ashok Kumar Mishra
Summary: FDAPT is an efficient environment-sensitive fluorescent probe that can sense the alteration of its microenvironment with six different fluorescent parameters. The study investigates the saccharide-induced dehydration of a F127 polymeric micelle using multiparametric fluorescence approach, revealing that saccharide molecules not only decrease the critical micellization temperature of the F127 solution but also strongly alter the physical properties inside the micellar structures. The dehydration efficiency order of different saccharide molecules is found to be trisaccharide (raffinose) > disaccharide (sucrose) > monosaccharide (glucose and fructose), with dehydration occurring more significantly in the core region than in the corona region.
Article
Energy & Fuels
Kousar Jahan, Vikram Singh, Nitisha Mehrotra, Kalpana Rathore, Vivek Verma
Summary: This study synthesized activated carbon from chickpea peel waste and investigated the effect of different conditions on dye removal performance. The results showed that the porous carbon prepared under the conditions of pre-carbonization at 400 degrees Celsius, KOH ratio of 1:3, and activation temperature of 800 degrees Celsius demonstrated excellent adsorption performance. These findings provide evidence for the feasibility of using chickpea peel waste as a low-cost and sustainable precursor for activated carbon material.
BIOMASS CONVERSION AND BIOREFINERY
(2023)
Article
Electrochemistry
Noufal Merukan Chola, Vikram Singh, Vivek Verma, Rajaram K. Nagarale
Summary: This study reports a ferrocene-based organic cathode synthesized following green chemistry principles and stabilized by low-temperature thermal encapsulation in multiwalled carbon nanotubes. The intercalation improves the capacity and retention of the electrode material, and the stability is attributed to the friendly host-guest interaction between CNTs and organic molecules. The thermal intercalation in MWCNTs is found to be an excellent method for stabilizing electrode materials in battery applications.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Vikram Singh, B. Gorbel, Shovon Chatterjee, Pratik Sen, Vivek Verma
Summary: In this study, fluorescent nitrogen-enriched carbon nanoparticles (N-CNPs) were synthesized and demonstrated strong blue fluorescence with 24% quantum yield. These N-CNPs were used as invisible ink for security purposes, being visible only under UV light illumination.
Article
Chemistry, Physical
Anand Kumar Sahu, Ashok Kumar Mishra
Summary: This study investigated the photophysical behavior of structurally related flavonols in different solvents and a model membrane. The results showed that the behavior of flavonols varied in different solvent environments and membranes. The number of B-ring hydroxy groups and membrane fluidity affected the binding of flavonols with the membrane. Additionally, flavonols exhibited antioxidant activity in the membrane.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Polymer Science
Chetan M. Pawar, Sooraj Sreenath, Vidhiben Dave, Priyanka P. Bavdane, Vikram Singh, Vivek Verma, Rajaram K. Nagarale
Summary: In this study, a base-catalysed carbanion formation method of N-methyl-4-piperidone (NMPi) and the synthesis of a thermoset anion exchange membrane were reported. The membrane exhibited good applicability and stability in highly acidic environments, making it suitable for acid recovery processes.
Article
Chemistry, Physical
Sonali Sahu, Venkatakrishnan Parthasarathy, Ashok Kumar Mishra
Summary: Organic push-pull molecules with donor and acceptor moieties connected via pi-linkages exhibit interesting photophysical properties due to intramolecular electron charge transfer. This study investigated basic phenylethynylanthracene derivatives to demonstrate that their photophysical properties can be dramatically changed by substituents. The emission properties and ICT abilities of these molecules were compared with different electron donating and withdrawing substituents. The study also showed the sensitivity of these compounds towards microviscosity and demonstrated the application of a white light emitting gel in a commercial UV LED.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Imaging Science & Photographic Technology
Kundan Singh Rawat, Vikram Singh, Chandra Prakash Sharma, Akanksha Vyas, Priyanka Pandey, Jagriti Singh, Neeraj Mohan Gupta, Monika Sachdev, Atul Goel
Summary: In this study, functional modified luminescent carbon quantum dots (CQDs) were synthesized from watermelon juice for the detection of toxic Pb2+ ions in polluted water and cancer cells. Among these CQDs, watermelon-ethylenediamine (WMED)-CQDs showed high selectivity and a low limit of detection (LoD) for Pb2+ ions. The WMED-CQDs can be used as eco-friendly nanomaterials in environmental and biomedical research areas.
JOURNAL OF IMAGING
(2023)
Review
Chemistry, Multidisciplinary
Tuhin Mandal, Shiv Rag Mishra, Kartikey Singh, Hridesh Agarwalla, Reginald Ebhin Masto, Manish Kumar, Vikram Singh
Summary: Coal is a cheap and sustainable precursor for the preparation of fluorescent carbon nanomaterials (FCNMs), which have sparked interest due to their distinctive fluorescence and various potential benefits. The use of coal as a starting material for FCNM synthesis provides a low-cost and environmentally acceptable method for producing carbon-based nanomaterials. This review highlights the importance of precursor choice in the synthesis of carbon nanomaterials and explores the applications of coal-derived FCNMs in different fields.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Article
Chemistry, Physical
Asit Kumar Pradhan, Manaswini Ray, Venkatakrishnan Parthasarathy, Ashok Kumar Mishra
Summary: This study explores the photophysical, electrochemical, and fluorescence polarization properties of a group of pi-conjugated phenylethynyl-2,1,3-benzothiadiazole derivatives. It is found that derivatives with strong electron-donating substituents exhibit pronounced solvatochromic behavior and a strong ICT character in the excited state. Different types of BTDs show different fluorescence quantum yields in different solvent media.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Review
Chemistry, Multidisciplinary
Tuhin Mandal, Shiv Rag Mishra, Vikram Singh
Summary: Red emitting fluorescent carbon nanomaterials have attracted significant scientific interest due to their advantages such as high quantum yield, water-dispersibility, and low cost. This review highlights several important factors affecting red emission and explains the origin of red fluorescence and tunable emission in these materials. Red emitting fluorescent carbon nanomaterials have potential multifunctional applications in various fields.
NANOSCALE ADVANCES
(2023)
Article
Chemistry, Analytical
Swayam Prakash, Ashok Kumar Mishra
Summary: This study developed a simple, low-cost, and rapid fluorescence-based analytical method for real-time detection of trace faecal pigments, which is of great significance for water quality monitoring.
ANALYTICAL METHODS
(2022)
Article
Chemistry, Analytical
Swayam Prakash, Ashok Kumar Mishra
Summary: This study introduces a new analytical paradigm for high sensitivity detection of fecal pigments (FPs) by fluorescence enhancement and background fluorescence minimization. The use of 1-hexanol as an efficient extraction medium for FPs is proposed, along with the complexation of FP-Zn(ii) in alcohol media to enhance fluorescence emission intensity and reduce interference, enabling the detection of FPs at picomolar to sub-picomolar concentrations. The study also examines the complexation behavior of FPs with various metal salts and validates the proposed analytical method using real water samples.
ANALYTICAL METHODS
(2021)
