JOURNAL OF MOLECULAR STRUCTURE
·
2022
·
IF 3.841
Renping Cao,Jiuqin Wei,Ting Chen,Bang Lan,Lan Li,Ru Liu,Zhiyang Luo,Jing Wang
Ba2MgSi2O7:M (M = Bi 3+ , Sm 3+ , Sm 3+ /Bi 3+ ) phosphors are synthesized in air by the high-temperature solid-state reaction method. All samples are confirmed to be a pure phase. With a 316 nm excitation wavelength, Ba 2 MgSi 2 O 7 :Bi 3+ shows blue-white emission including a broad emission band in the range of 340 - 750 nm, and Ba 2 MgSi 2 O 7 :Sm 3+ , Bi 3+ emits a adjustable-color light with the change of the ratio of Sm 3+ to Bi 3+ ions. Under excited at 402 nm, Ba 2 MgSi 2 O 7 :Sm 3+ and Ba 2 MgSi 2 O 7 :Sm 3+ , Bi 3+ emit orange-red light with emission spectrum region from 545 nm to 750 nm, which contain four emission bands peaking at ∼560, 598, 646 and 704 nm due to the 4 G 5/2 → 6 H 5/2 , 6 H 7/2 , 6 H 9/2 , and 6 H 11/2 transitions of Sm 3+ ion, respectively. Ba 2 MgSi 2 O 7 :Sm 3+ , Bi 3+ under excitation at 316 nm can show a white-color emission by changing the ratio between Sm 3+ and Bi 3+ ions. Lifetimes of samples decrease with increasing doped ion (Sm 3+ or Bi 3+ ) concentration. We explain the luminous mechanism of samples by the schematic energy level diagrams of Bi 3+ and Sm 3+ ions in Ba 2 MgSi 2 O 7 :Sm 3+ , Bi 3+ .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Ronghua Ma,Xiaoyan Wei,Chunfeng Wang,Shaohui Mao,Bing Chen,Yonghong Shao,Yu Fu,Keyu Yan,Dengfeng Peng
Mechanoluminescenece (ML) is a dynamic luminescence phenomenon of materials under various mechanical stimulation. Impurity doped ZnS shows high ML repeatability without any needs for extra excitation sources, thus making it very promising in applications like stress sensing and battery-free new light source . Lots of progress has been made in the last decades, however, the reproducible ML (RML) mechanism is still unclear to explain some basic phenomena like how the electron is excited to conduction band when undergoing mechanical actions or how the excitation energy is transferred to the dopants so efficiently. Based on comparative study of photoluminescence (PL) and ML in Mn 2+ doped ZnS prepared via melt-salt method, the RML energy routes in sphalerite ZnS: Mn 2+ is proposed herein, and further, a general mechanism is supposed which could apply to other RML systems. The excitation of RML is possibly generated by electron transfer during bond rebuilding in plastic deformation while the highly efficient energy transfer is realized through hole and electron capture by the dopant. According to this mechanism, we provide some prospects for further optimization of RML performance as well as discovery of new RML materials.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Renping Cao,Jinlong Zhang,Wudi Wang,Zuofu Hu,Ting Chen,Yuanxiu Ye,Xiaoguang Yu
Li 2 Mg 3 SnO 6 :Mn 4+ deep red phosphor is synthesized by high-temperature solid-state reaction method in air. With excitation 330 and 480 nm, the emission band peaking at ∼670 nm within the range 600–790 nm is observed owing to the 2 E → 4 A 2 transition of Mn 4+ ion. Excitation bands peaking at ∼330, 395, and 480 nm in the range of 220–600 nm indicate that Li 2 Mg 3 SnO 6 :Mn 4+ phosphor can be effectively excited by (near) ultraviolet and blue light-emitting diode chips. The optimal Mn 4+ ion concentration is ∼0.4 mol%. Fluorescence lifetime and quantum efficiency of Li 2 Mg 3 SnO 6 :0.4%Mn 4+ phosphor with excitation 330 nm are ∼266.67 μs and 36.3%, respectively. The luminous mechanism is explained by the Tanabe-Sugano energy level diagram of Mn 4+ in the octahedron.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2020
·
IF 6.785
Xiaoqing Sun,Jing Lei,Yan Jin,Baoxin Li
Most of the known chemiluminescence (CL) systems are flash-type, whereas a CL system with long-lasting and strong emission is very favorable for accurate CL quantitative analysis and imaging assays. In this work, we found that the oxidized g-C3N4 (g-CNOX) could trigger luminol-H2O2 to produce a long-lasting and intense CL emission. The CL emission lasted for over 10 min and could be observed by the naked eye in a dark room. By means of a CL spectrum, X-ray photoelectron spectra, and electron spin resonance spectra, the possible mechanism of this CL reaction was proposed. This strong and long-duration CL emission was attributed to the high catalytic activity of g-CNOX nanosheets and continuous generation of reactive oxygen species from H2O2 on g-CNOX surface. Taking full advantage of the long-lasting CL property of this system, we proposed one “non-in-situ mixing” mode of CL measurement. Compared with the traditional “in-situ mixing” CL measurement mode, this measurement mode was convenient to operate and had good reproducibility. This work not only provides a long-lasting CL reaction but also deepens the understanding of the structure and properties of g-C3N4 material.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuaiqi Zhao,Xiaolei Yang,Yumeng Ge,Hongbin Zhang,Jie Li,Keyu Han,Shiqing Xu,Gongxun Bai
The all-inorganic perovskite nanocrystals are promising luminescent materials for optoelectronic devices. However, it is still a challenge to prepare perovskite nanocrystals with high luminescence. Herein, a synthesis method was developed for the uniform incorporation of ultra-thin BiOBr nanosheets into perovskite crystals at both body-embedding and surface-passivating positions. The micron-scale green-emitting phosphors composed of Cs 4 PbBr 6 nanocrystals and BiOBr nanosheets are prepared. The crystal structure of Cs 4 PbBr 6 nanocrystals can remain almost unchanged although prepared from different PbBr 2 concentrations. The luminescence mechanism of Cs 4 PbBr 6 is discussed. The Cs 4 PbBr 6 @BiOBr submicron phosphors can be dispersed in DMSO solvent without disintegration and dissolution, which are used as seeds of the CsPbBr 3 film growth. The CsPbBr 3 films with Cs 4 PbBr 6 @BiOBr doped exhibit pure optical characteristics of CsPbBr 3 , indicating that Cs 4 PbBr 6 is converted to CsPbBr 3 during the film preparation process. Furthermore, these Cs 4 PbBr 6 @BiOBr phosphors are mixed with CaAlSiN 3 : Eu red-emitting commercial phosphors to make white LEDs (WLEDs). Overall, this study provides a revealing insight into a kind of composite material constructed with halide perovskite and bismuth halide oxide.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6342
·
IF 3.623
Ming Wei,Ye Tian,Lijun Wang,Yuankai Hong,Dan Luo,Yinlin Sha
The absorption and emission mechanisms of gold nanoclusters (AuNCs) have yet to be understood. In this article, 11-Mercaptoundecanoic acid (MUA) capped AuNCs (AuNC@MUA) were synthesized using the chemical etching method. Compared with MUA, AuNC@MUA had three obvious absorption peaks at 280 nm, 360 nm, and 390 nm; its photoluminescence excitation (PLE) peak and photoluminescence (PL) peak were located at 285 nm and 600 nm, respectively. The AuNC@MUA was hardly emissive when 360 nm and 390 nm were chosen as excitation wavelengths. The extremely large stokes-shift (>300 nm), and the mismatch between the excitation peaks and absorption peaks of AuNC@MUA, make it a particularly suitable model for studying the emission mechanism. When the ligands were partially removed by a small amount of sodium hypochlorite (NaClO) solution, the absorption peak showed a remarkable rise at 288 nm and declines at 360 nm and 390 nm. These experimental results illustrated that the absorption peak at 288 nm was mainly from metal-to-metal charge transfer (MMCT), while the absorption peaks at 360 nm and 390 nm were mainly from ligand-to-metal charge transfer (LMCT). The PLE peak coincided with the former absorption peak, which implied that the emission of the AuNC@MUA was originally from MMCT. It was also interesting that the emission mechanism could be switched to LMCT from MMCT by decreasing the size of the nanoclusters using 16-mercaptohexadecanoic acid (MHA), which possesses a stronger etching ability. Moreover, due to the different PL intensities of AuNC@MUA in methanol, ethanol, and water, it has been successfully applied in detecting methanol in adulterated wine models (methanol-ethanol-water mixtures).Keywords:gold nanocluster;source of absorption;emission mechanism;ligand;size effect
研究领域:
化学
·
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Xuemin Wen,Maksym Buryi,Vladimir Babin,David John,Romana Kučerková,Martin Nikl,Qian Wang,Yunyun Li,Wen Li,Fan Yang,Xiaoping OuYang,Yuntao Wu
The development of ultrafast scintillators is critical to the GHz X-ray and time-of-flight (TOF) imaging techniques. Low-dimensional silver-based halides have emerged as promising candidates due to high radioluminescence efficiency and ultrafast decay time. However, the ultrafast scintillation mechanism in silver-based halides, such as Rb 2 AgBr 3 (RAB), remains controversial. Here, the study reveals the origin of ultrafast scintillation timing response in melt-grown RAB bulk crystals. The RAB shows light-yellow emission with a photoluminescence quantum yield (PLQY) of 13.9%. Under the picosecond (ps) pulse X-ray irradiation, RAB has an ultrafast decay time of 3.2 ns that accounts for 40.5% of the total emitted light. The light yield is estimated as 3100 photons MeV −1 under 22 Na irradiation. Based on the temperature-dependent radioluminescence (RL) spectroscopy, electron paramagnetic resonance (EPR) spectroscopy, and spectrally resolved thermally-stimulated luminescence (TSL) glow curves, it is confirmed that the bromine vacancy as the F-center is the origin of the ultrafast scintillation component. These findings provide elaborated and fundamental insights into the ultrafast luminescent mechanisms of low-dimensional silver-based halides, thereby opening up new design horizons in the development of ultrafast scintillators.
研究领域:
材料科学
·
光学
·
辐射探测
✓ 已验证
DOI
高影响因子
Biosensors-Basel
·
2022
·Vol. 12
·期 9
·732
·
IF 5.743
Xin Leng,Du Wang,Zhaoxiang Mi,Yuchen Zhang,Bingqin Yang,Fulin Chen
Copper is an important trace element that plays a crucial role in various physiological and biochemical processes in the body. The level of copper content is significantly related to many diseases, so it is very important to establish effective and sensitive methods for copper detection in vitro and vivo. Copper-selective probes have attracted considerable interest in environmental testing and life-process research, but fewer investigations have focused on the luminescence mechanism and bioimaging for Cu2+detection. In the current study, a novel fluorescein-based A5 fluorescence probe is synthesized and characterized, and the bioimaging performance of the probe is also tested. We observed that the A5 displayed extraordinary selectivity and sensitivity properties to Cu2+in contrast to other cations in solution. The reaction between A5 and Cu2+could accelerate the ring-opening process, resulting in a new band at 525 nm during a larger pH range. A good linearity between the fluorescence intensity and concentrations of Cu2+, ranging from 0.1 to 1.5 equivalent, was observed, and the limit detection of A5 to Cu2+was 0.11 μM. In addition, the Job’s plot and mass spectrum showed that A5 complexed Cu2+in a 1:1 manner. The apparent color change in the A5–Cu2+complex under ultraviolet light at low molar concentrations revealed that A5 is a suitable probe for the detection of Cu2+. The biological test results show that the A5 probe has good biocompatibility and can be used for the cell imaging of Cu2+.Keywords:copper ion;fluorescence probe;luminescence mechanism;detection method;bioimaging
研究领域:
生物化学
·
分析化学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Yan Rong,Lingrui Wang,Yongheng Wang,Wenxin Wang,Jiaxiang Wang,Yifang Yuan,Urooj Shahzadi,Junnian Chen,Lei Zhang,Kai Wang,Haizhong Guo
Understanding the luminescence mechanics of metal halide perovskites is the key to uncovering the detailed pathways responsible for remarkable photophysical properties and engineering materials with enhanced optoelectronic properties. In this work, high pressure is employed to reveal the self-trapped exciton (STE) emission features of a 1D lead bromide perovskitoid (HM)Pb 2 Br 6 . Upon compression, a remarkable 42-fold enhancement in the intensity compared to the initial emission, along with exciton transfer from STE emission to narrow free exciton emission, is achieved in (HM)Pb 2 Br 6 . These phenomena are related to the anisotropic compression of (HM)Pb 2 Br 6 , which results in enhanced structural stiffness and a significant reduction in the distances of Pb─Pb bond lengths between inter-[Pb 2 Br 6 ] 2− chains, as well as Pb─Br bond lengths within the three basic intra-[Pb 2 Br 6 ] 2− octahedra. These results provide essential insights into the intriguing photophysics of STEs and shed new light on the dramatic exciton transfer to control and enhance the optical properties of the metal halide perovskites.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 21
·1900775
·
IF 7.125
Qianyi Guo,Minchen Wei,Zekun Zheng,Xiongjian Huang,Xiaoqian Song,Shao-Bin Qiu,Xiao-bao Yang,Xiaofeng Liu,Jianrong Qiu,Guoping Dong
Polymeric g-C 3 N 4 with controllable photoluminescence emission wavelength in the whole visible light range (450–650 nm) is synthesized through the one-step molecular doping during the thermal condensation process of g-C 3 N 4 conjugated framework, which opens up its application beyond the conventional catalysis scopes. By adjusting the doped content of hetero-molecules, the modified g-C 3 N 4 with the optical properties controlled according to the demand of practical applications can be facilely and largely obtained. It overcomes the limitation of the narrow adjusting range of conventional g-C 3 N 4 on optical properties and makes it become more promising for applications in solid-state displays. The corresponding multiple-color g-C 3 N 4 -based LED devices and the white-light LEDs with high quality can be obtained as supported by experiments and theoretical calculations. Moreover, the effect of doped molecule on the π-conjugated system of g-C 3 N 4 is systematically studied here, and the tunable luminescence mechanism is proposed.
研究领域:
材料科学
·
光学工程
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 4
·1-13
·
IF 2.253
Liang Caimei,Hu Xiaoxi,Wang Yun,Zhang Yanjun,Fu Guo,Li Chunxing
Carbon quantum dots surface doped with nitrogen (N-CQDs) were synthesized with quantum yield (24.9–66.4%) via an easy hydrothermal route while using citric acid as a precursor for carbon and varying concentrations of DL-Alaninol as the dopant. The as-prepared N-CQDs with adjustable fluorescence emission transformed from weak excitation-dependent to excitation-dependent and then to excitation-independent. After a detailed characterization and investigation, the N-CQDs were found to have a uniform particle size (1.76–3.07 nm) and good monodispersion. They were bearing similar functional groups on their surfaces but with different contents. The N/C ratio of N-CQDs increased gradually with the increasing contents of dopant, while the O/C ratio gradually decreased. The photoluminescence (PL) of (N-CQDs) has been explained by a proposed PL mechanism that involved quantum size effect and the energy levels by the surface state. When further investigated as a fluorescent probe for Fe 3+ ion detection, the synthesized N-CQDs were found to be selectively and sensitively detecting Fe 3+ ions. The N-CQD-based fluorescent probe was capable of detecting in a wider linear detection range and lower limits of detection (LODs). Graphical abstract
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Bin Dai,Chengxiao Wu,Yixuan Lu,Degang Deng,Shiqing Xu
The reaction temperature was controlled to investigate the formation process of S-doped CDs (CDs-S). Different low-molecule-weight organics were used as precursors, it reveals that the N and/or S atoms containing in the precursors are related to the formation and luminescence mechanism.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）