Article
Engineering, Environmental
Mengzhu Wang, Feiyang Li, Yunxiang Lei, Fuming Xiao, Miaochang Liu, Shujuan Liu, Xiaobo Huang, Huayue Wu, Qiang Zhao
Summary: By designing and synthesizing novel ORTP materials, the regulation of excitation-dependent luminescence colors has been achieved, showing great potential for advanced applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Bin Xu, Yuehan Jia, Huiying Ning, Qian Teng, Chenhao Li, Xiaoqi Fang, Jie Li, Heng Zhou, Xiangeng Meng, Zhenhua Gao, Xue Wang, Zifei Wang, Fanglong Yuan
Summary: New phosphorescent materials with record-long lifetimes under visible light excitation are demonstrated by embedding nitrogen doped carbon dots (N-CDs) into a poly(vinyl alcohol) (PVA) film. The robust hydrogen bonding interactions effectively reduce the non-radiative decay rate and radiative transition rate of triplet excitons, leading to dramatically prolonged phosphorescence lifetime. The practical applications of these materials in anti-counterfeiting security and optical information storage domains are also demonstrated.
Article
Materials Science, Multidisciplinary
Jieqiu Wang, Fei Pang, Qianqian Fu, Jianping Ge
Summary: Photonic crystal patterns with angle-dependent colors are a promising anti-counterfeiting material. Delicate PC patterns can be fabricated by silkscreen printing of photo-curable SiO2/monomer PC inks on the substrate, followed by UV irradiation to fix the PC structures. The resulting PC marks show noticeable angle effects, uniform color distribution, and good mechanical and chemical stabilities. Different silk screen stencils are investigated to achieve the best color intensity and printing resolution. As a demonstration of their anti-counterfeiting functions, the PC patterns exhibit color changes and reversible switches under different angles.
SCIENCE CHINA-MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Le Zhang, Yang Wang, Zhentao Bian, Sridhar Komarneni, Guangzhou Hu
Summary: In this study, phosphorescent composite materials with time-dependent color-changing properties were synthesized using a one-pot method, and applied in the field of anti-counterfeiting.
Article
Chemistry, Applied
Hongrui Cheng, Song Chen, Min Li, Yongfeng Lu, Haixin Chen, Xiao Fang, Haijiang Qiu, Wensong Wang, Cheng Jiang, Yuanhui Zheng
Summary: This article introduces a universal method for the fabrication of a carbon-dot@silica composite with ultralong lifetime, high phosphorescence quantum efficiency, excellent luminescence stability, and dual-color phosphorescence emission. The triplet excited states of carbon dots are stabilized by the rigid network of silica and the stable covalent bonding between carbon dots and silica. The carbon-dot@silica exhibit ultralong lifetimes of 1.33 s and 0.38 s under excitation at 254 nm and 365 nm, respectively. Moreover, the phosphorescence color of the carbon-dot@silica can change from cyan to yellow when the exciting wavelength switches from 254 nm to 365 nm. The obtained carbon-dot@silica also show outstanding characteristics of anti-photobleaching and phosphorescence stability in an aqueous solution. Based on the unique phosphorescent properties of the carbon-dot@silica, a stable and dual-color phosphorescence security label is designed for advanced information encryption.
Article
Chemistry, Physical
Feng Liu, Zeyu Li, Yu Li, Yiyu Feng, Wei Feng
Summary: The study found that fluorine-nitrogen co-doped carbon dots exhibit high RTP lifetime and quantum yield, mainly originating from specific electron transitions. Additionally, hydrogen bonding between carbon dots and polyvinyl alcohol matrix, as well as semi-ionic C-F bonds, can enhance the efficiency of RTP.
Article
Chemistry, Multidisciplinary
Hongrui Cheng, Xiaofeng Wei, Haijiang Qiu, Wensong Wang, Wenyue Su, Yuanhui Zheng
Summary: A novel in situ fluorescent patterning strategy was developed to achieve covert, chemically stable and solvent-tolerant cellulose-based security labels by UV exposure. The fluorescent emission of cellulose-based materials exhibits excellent stability under various environments, indicating great potential for applications.
Review
Chemistry, Multidisciplinary
Kaiti Wang, Lunjun Qu, Chaolong Yang
Summary: As a type of room temperature phosphorescence (RTP) material, carbon dots (CDs) have short lifetime and low phosphorescence efficiency. Various strategies have been developed to improve these disadvantages, including embedding in rigid matrix, introducing heteroatom, and crosslink-enhanced emission. Doping CDs into different matrices is the main method for preparing long-lived CDs-based RTP materials. However, matrix-free CDs and carbonized polymer dots-based RTP materials have also been widely explored. The recent progress, efficient strategies, and emission mechanisms of CDs-based RTP materials are summarized and reviewed in detail. These materials show great application potential in anti-counterfeiting, data encryption, and biological monitoring due to their excellent chemical stability, photostability, and low biological toxicity.
Review
Materials Science, Multidisciplinary
Kashmitha Muthamma, Dhanya Sunil, Prakasha Shetty
Summary: This article explores the use of fluorescent carbon nanodots in security printing, highlighting their importance and application value in combating counterfeits. The synthesis techniques and development trends of security inks are outlined, with future research directions proposed to enhance security features.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Physical
Hongmei Zhang, Lili Sun, Xiangjun Guo, Jiyao Xu, Xihui Zhao, Yanzhi Xia
Summary: In this study, three different colors of carbon dots (B-CDs, C-CDs, and G-CDs) were prepared using a one-step hydrothermal method. By dispersing the carbon dots in sodium alginate, fluorescent/phosphorescent solid powders were obtained. The phosphorescence lifetimes of these powders were measured, and they showed potential applications in information encryption and anti-counterfeiting.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Deliang Wang, Junyi Gong, Yu Xiong, Hongzhuo Wu, Zheng Zhao, Dong Wang, Ben Zhong Tang
Summary: By doping organic materials with color-tunable and time-dependent long persistent luminescence, the encryption level can be improved, leading to promising applications in anti-counterfeiting.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Applied
Chenxia Hao, Yunfeng Bai, Lu Zhao, Yayan Bao, Jinai Bian, Hui Xu, Tao Zhou, Feng Feng
Summary: Developing durable room temperature phosphorescent carbon dot-based materials with high stability and easy preparation has been a challenge. Through a one-step hydrolysis-assisted carbonization treatment, nitrogen-doped carbon dots encapsulated in silica (N-CDs@silica) were obtained, exhibiting outstanding stability and durable room temperature phosphorescence. The unique optical properties of NCDs@silica were utilized to develop RTP strip probes for selective Fe3+ detection and as security ink for advanced anti-counterfeiting. This work not only provides a strategy to optimize the structural and luminescent properties of N-CDs@silica, but also opens a new perspective for developing simple RTP strip probes for sensor applications.
Review
Chemistry, Multidisciplinary
Shengju Zhou, Feixiang Wang, Ning Feng, Aoxue Xu, Xiaofeng Sun, Jin Zhou, Hongguang Li
Summary: This review summarizes the important progress made in room temperature phosphorescence (RTP) carbon dots (CDs), including their synthetic strategies, performance regulation, and potential applications in anti-counterfeiting, information encryption, sensing, light-emitting diodes, and biomedicine. The remaining major challenges for RTP CDs are discussed and new opportunities in the future are proposed.
Article
Chemistry, Multidisciplinary
Xiaowei Yu, Kaikai Liu, Hongyue Zhang, Bolun Wang, Wenyan Ma, Jiyang Li, Jihong Yu
Summary: Carbon dots were incorporated into Eu-substituted AlPO4-5 zeolite to create a composite with triple emissions for advanced luminescence anti-counterfeiting. The composite displays excellent resistance and stability, and only requires two common excitation lights to trigger the triple emissions.
Article
Chemistry, Physical
Mingsheng Xu, Chen Dong, Jiahui Xu, Sajid Ur Rehman, Qiyang Wang, Vladimir Yu Osipov, Kai Jiang, Junfeng Wang, Hong Bi
Summary: Carbon dots (CDs) have excellent optical properties, and in this study, a polymer nanocomposite containing fluorinated carbon dots (FCDs) was synthesized, showing temperature-sensitive optical properties that can be applied in anticounterfeiting, information encryption, and thermo-sensitive sensors.
Article
Chemistry, Physical
Qijun Li, Ming Zhou, Qingfeng Yang, Qian Wu, Jing Shi, Aihua Gong, Mingyang Yang
CHEMISTRY OF MATERIALS
(2016)
Article
Multidisciplinary Sciences
Qijun Li, Ming Zhou, Mingyang Yang, Qingfeng Yang, Zhixun Zhang, Jing Shi
NATURE COMMUNICATIONS
(2018)
Article
Chemistry, Physical
Qijun Li, Ming Zhou, Qingfeng Yang, Mingyang Yang, Qian Wu, Zhixun Zhang, Jianwen Yu
JOURNAL OF MATERIALS CHEMISTRY A
(2018)
Article
Materials Science, Multidisciplinary
Jing Tan, Yunxia Ye, Xudong Ren, Wei Zhao, Dongmei Yue
JOURNAL OF MATERIALS CHEMISTRY C
(2018)
Article
Engineering, Electrical & Electronic
Jian Yang, Shuai Meng, Yuchen Li, Yunxia Ye, Jing Tan, Qijun Li, Xudong Ren
Summary: A broadband, low-cost, and flexible THz absorber is achieved using annealed carbonized sponge obtained from a commercially available melamine sponge through a pyrolysis process. The obtained CS shows excellent shielding and absorption performance covering a wide frequency bandwidth, far extending most reported materials. This efficient THz absorber has potential applications in electromagnetic stealth, shielding, and beyond, as demonstrated by THz transmission and reflection imagings.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Physical
Qijun Li, Shuai Meng, Yuchen Li, Dengke Cheng, Hailing Gu, Zhenxiao Zhao, Zikang Tang, Jing Tan, Songnan Qu
Summary: We demonstrate a novel strategy to induce tunable dynamic phosphorescence color from carbon dots (CDs) on papers via surface ionization engineering for advanced information security. By alkali or thermal treatment, the CDs on paper can exhibit a color-changing phosphorescence emission, enabling multi-stimuli (alkali or thermal) and multi-modal dynamic phosphorescent colors from a single CDs system. These capabilities open up possibilities for multimode encryption and smart 3D codes with anti-counterfeiting and monitoring functions.
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)
Article
Chemistry, Multidisciplinary
Qijun Li, Yukun Qin, Dengke Cheng, Ming Cheng, Hongjia Zhao, Lvzhou Li, Songnan Qu, Jing Tan, Jianning Ding
Summary: Moisture-enabled electricity generation (MEG) has been developed based on the combination of carbonized polymer dots (CPDs) and liquid metal (LM) active electrodes. The MEG device shows a stable voltage output of 800 mV and a high current density of 1640 mu A cm(-2). Even at a low air humidity of 15%, the device can provide a high voltage output of 0.65 V and a considerable current density of 12 mu A cm(-2). The diffusion of hydrogen ions in CPDs and the ionization of additional metal ions from the LM electrode contribute to the high electricity generation. The device can be easily integrated on flexible substrates and generate an ultrahigh voltage of 210 V, showing great potential in large-scale fabrication and application.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Optics
Ruochen Li, Yi Wang, Qijun Li, Guoming Sun
Summary: This study reports a facile method to tune the pore size of gelatin film by controlling annealing temperature, and achieve photo-induced phosphorescence of Carbon dots (CDs) in porous gelatin film. The fabricated CDs@Gelatin film can display spatially accurate photoinduced dynamic phosphorescence, which can be activated after a few seconds of photo-irradiation and deactivated by placing in air for a period of time.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Multidisciplinary
Yukun Qin, Jing Tan, Shuai Meng, Yuchen Li, Mengde Zhai, Xiaoxian Song, Cheng Chen, Xudong Ren, Qijun Li, Ming Cheng, Jianning Ding
Summary: Moisture-enabled electricity generation (MEG) is a sustainable technique for generating electric power. Carbon dots (CDs) are low-cost and can be surface-functionalized, making them promising materials for MEG devices. In this study, CDs were functionalized with 1,5-naphthalenedisulfonic acid (1,5-NDSA), resulting in a CD-based MEG device with a record-high voltage output of 380 mV. The functionalized CDs facilitated proton gradient formation and improved ionic conductivity, leading to enhanced electricity output. The assembled device can power an electronic calculator and the output can be further boosted in moist air, making it suitable for windy and high humidity areas.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Qijun Li, Zhenxiao Zhao, Shuai Meng, Yuchen Li, Yunyang Zhao, Bohan Zhang, Zikang Tang, Jing Tan, Songnan Qu
Summary: A new strategy is reported for the preparation of high-efficiency and strong room-temperature phosphorescence materials through grinding-induced transformation. The method achieves uniform embedding of carbon dots in boron acid crystals, resulting in enhanced phosphorescence.
Article
Materials Science, Multidisciplinary
Qijun Li, Yuchen Li, Shuai Meng, Jian Yang, Yukun Qin, Jing Tan, Songnan Qu
Summary: The CD@BA powders prepared by heat treatment exhibit highly efficient white-light emissions with a total quantum yield of 46% and a phosphorescence QY of 30%, along with an emission spectrum width over 180nm. Doping of N and B atoms and the strong interaction between CDs and the BA matrix effectively prevent aggregation-induced quenching and greatly promote phosphorescence emission.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
