MACROMOLECULAR RAPID COMMUNICATIONS
·
2020
·Vol. 41
·期 14
·2000198
·
IF 4.886
Xu Yu,Yan-Cai Gao,Hong-Wei Li,Yuqing Wu
Unlike normal conversion from aggregation caused quenching (ACQ) to aggregation induced emission enhancement (AIEE) by introducing aromatic rotors tuning aggregation modes, in this study, it is achieved through a supramolecular assembly with polymer. Thus, it provides an easy approach for the inhibition of unwanted H-aggregation between luminogens. As a kind of flavonoid, morin has shown great potential in therapeutics. However, its poor solubility and weak emission in aqueous solution greatly limit its bioapplications. When morin is dissolved in aqueous solution, the presence of 30 × 10 −6 m polyethyleneimine (PEI) induces significant emission enhancement and bathochromic shift. Consequently, the quantum yield (QY) of 24.5% is either achieved by assembling with PEI, versus 0.76% of its ACQ state composed of H-aggregation in aqueous solution. Particularly, the in-depth mechanism studies reveal that it is the assembly with PEI that disassociates the H-aggregation in aqueous solution and further restricts the stretching and/or rotation of morin, which eventually reduce the nonradiative decays and enhance the emission. Therefore, the present study reports a unique phenomenon of AIEE effects on morin. Particularly the in-depth investigation on intrinsic mechanisms will highlight and greatly expand the development of more luminogens from traditional Chinese herbals.
研究领域:
化学
·
生物医学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ting Wang,Lixin Ma,Yingcui Bu,Xinjie Xu,Xuan Zhao,Yingyong Ni,Qitao Zhao,Zhou Lu,Fei Ge,Hongping Zhou
Selectively transforming the non-radiative pathway of excited-state photosensitizers (PSs) into radiative and intersystem crossing (ISC) processes is crucial for fluorescence imaging-guided photodynamic therapy (PDT). Herein, human serum albumin (HSA), with abundant amino acid residues, was co-assembled with anion-π + PSs ( An-O , AnS-O , and AnSS-O ) to create PSs-albumin complexes ( An-O@HSA , AnS-O@HSA , and AnSS-O@HSA ), resulting in promoted biocompatibility and colloidal stability. Both in vitro and in vivo assessments demonstrated that AnSS-O@HSA exhibited the highest-performance fluorescence emission and superoxide anion (O 2 ‑• ) generation capacity, which can effectively induce enhanced apoptosis in HepG2 cells. In-depth mechanistic investigations revealed that HSA, functioning as a boosting agent, could effectively suppress nonradiative decay channels and prolong the triplet state lifetime of PSs. Additionally, HSA can also serve as an electronic reservoir, augmenting its photocurrent response, which further promoted the fluorescence imaging-guided PDT. This study presented a facile strategy for controlling the energy dissipation pathways in the excited state of PSs.
研究领域:
生物医学工程
·
药理学
·
分子生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Yulong Zhu,Chao Li,Jinhao Zang,Guangsong Zheng,Yang Nan,Xiaofan Xia,Zhichao Zhu,Guoqin Cao,Junhua Hu,Jinyang Zhu
Carbon dots (CDs) exhibit certain limitations in terms of afterglow emission intensity and water stability. Here, we present a strategy to enhance and stabilize the afterglow emission of CDs by sequentially modifying seed CDs with urea and 3-aminopropyltriethoxysilane. Compared to urea-modified CDs, the afterglow intensity of uCDs@SiO 2 was significantly enhanced by 25-fold, with the afterglow brightness increasing from 5.51 to 50.93 cd/m 2 under 5-watt illumination. More importantly, after calcination at 200 °C, uCDs@SiO 2 retain approximately 76% of their initial afterglow emission intensity in water solution over an 8-hour period. This retention is attributed to a dense SiO 2 matrix that mitigates oxygen-related surface defects and restricts non-radiative decay pathways. Finally, leveraging this robust afterglow, we demonstrate time-delay light-emitting diodes that continue to glow after power-off, as well as an information-encryption method based on selective quenching.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-9
·
IF 5.705
Li Yuemei,Li Yongmei,Wang Rui,Zheng Wei
Optical sensing of temperature by measurement of the ratio of the intensities of the 700 nm emission and the 800 nm emission of Ga(III)-doped ZnO (GZO) nanoparticles (NPs) and of GZO NPs coated with a silica shell are demonstrated at 980 nm excitation. It is found that the relative sensitivity of SiO 2 @Yb/Tm/GZO is 6.2% K −1 at a temperature of 693 K. This is ~3.4 times higher than that of Yb/Tm/GZO NPs. Obviously, the SiO 2 shell structure decreases the rate of the nonradiative decay. The decay time of the 800 nm emission of the Yb/Tm/GZO NPs (15 mol% Ga; 7 mol% Yb; 0.5 mol% Tm) displays a biexponential decay with a dominant decay time of 148 μs and a second decay time of ~412 μs. The lifetime of the Yb/Tm/GZO NPs at 293 K, and of the SiO 2 @Yb/Tm/GZO NPs are ~412 μs. Both the Yb/Tm/GZO and SiO 2 @Yb/Tm/GZO can be used up to 693 K. These results indicate that the SiO 2 shell on the Yb/Tm/GZO is beneficial in terms of sensitivity and resolution.
The enhancement the decay time and thermal sensitivity in the SiO 2 @Yb/Tm/GZO shell@core structure have been studied compared to the Ga(III)-doped Yb/Tm-doped ZnO (Yb/Tm/GZO). The SiO 2 @Yb/Tm/GZO have good thermal accuracy up to 693 °C.
研究领域:
光学传感
·
纳米材料
·
热力学测量
·
稀土掺杂材料
·
无机功能材料
✓ 已验证
DOI
高影响因子
Chinese Physics B
·
2023
·Vol. 32
·期 6
·067302
·
IF 1.7
Guo-Dong Yan,Zhen-Hua Zhang,Heng Guo,Jin-Ping Chen,Qing-Song Jiang,Qian-Nan Cui,Zeng-Liang Shi,Chun-Xiang Xu
Localized surface plasmon resonance (LSPR) has caused extensive concern and achieved widespread applications in optoelectronics. However, the weak coupling of plasmons and excitons in a nanometal/semiconductor system remains to be investigated via energy transfer. Herein, bandgap tunable perovskite films were synthesized to adjust the emission peaks, for further coupling with stable localized surface plasmons from gold nanoparticles. The degree of mismatch, using steady-state and transient photoluminescence (PL), was investigated systematically in two different cases of gold nanoparticles that were in direct contacting and insulated. The results demonstrated the process of tuning emission coupled to LSPR via wavelength-dependent photoluminescence intensity in the samples with an insulating spacer. In the direct contact case, the decreased radiative decay rate involves rapid plasmon resonance energy transfer to the perovskite semiconductor and non-radiative energy transfer to metal nanoparticles in the near-field range.
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 6
·期 3
·316-324
·
IF 6.482
Yuxuan Li,Keke Ding,Haozhong Wu,Qing Wan,Yao Ma,Yuhua Huang,Zhiming Wang,Weijie Zhang,Jianquan Hou,Ben Zhong Tang
Recently, research based on non-radiative decay processes leading to photodynamic therapy or photothermal therapy has become an attractive hotspot. Of particular importance is achieving better performance in photosensitive dye design. Herein, two comparable emitters (DEPZ-S and DEPZ-A) with the same electronic donor–acceptor segment were prepared, but their different symmetrical patterns caused different reactive oxygen species (ROS) generation capacity and photothermal conversion capacity, respectively, which indicates that their non-radiative decay channels could be switched between intersystem crossing (ISC) and thermal deactivation. Theoretical simulation exhibited coincident results, and their differentiated excited-state energy level distribution decided the non-radiative decay channels change: DEPZ-S with high intramolecular symmetry exhibited a larger spin–orbit coupling (SOC) matrix and smaller energy splitting (ΔEST) between singlet excited state and triplet excited state easily facilitating the ISC process, but asymmetric DEPZ-A with a narrow band gap (ΔES0S1) and big reorganization energy reduced the potential barrier of the thermal deactivation and increased its occurrence probability. After encapsulating two dyes with a hydrophilic polymer matrix to improve intake efficiency, both of them displayed good phototherapy treatment effect on bladder cancer cells through dynamic or thermal processes when light illuminated. This work provides a new strategy for tuning non-radiative decay channels via symmetric/asymmetric substituent effects to realize precise phototherapy.
研究领域:
生物医学
·
材料科学
·
光化学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Mengrong Hu,Zheng Li,Shufang Gao,Han Pan,Jian Luo
The excited-state intramolecular proton transfer (ESPT intra ) process in flavonoids has attracted considerable attention due to its fundamental role in their photophysics. This study systematically investigates the photophysical properties of 5-methoxyflavone (5MF), a flavonoid derivative incapable of ESPT intra . It was demonstrated that intermolecular hydrogen bonding with protic solvents effectively suppress the non-radiative ππ∗-nπ∗ internal conversion in 5MF, leading to significant fluorescence enhancement. In highly acidic aqueous solutions (pH < 3.3), an excited-state intermolecular proton transfer (ESPT inter ) process takes place, generating protonated 5MF (5MFH + ) and resulting in fluorescence quenching. Notably, when incorporated in acidic poly(vinyl alcohol) (PVA) films, the excited-state protonated species 5MFH + exhibits intense fluorescence with a long fluorescence lifetime of 8.4 ns, owing to the suppression of non-radiative decay pathways by the rigid polymer network. Additionally, the dense hydroxyl groups in the PVA matrix also enhance the emission of neutral 5MF. These results highlight the potential of both 5MF and 5MFH + as efficient luminescent chromophores for the design of optical materials based on hydrogen-bonding polymer systems.
研究领域:
光物理学
·
分析化学
·
高分子材料科学
·
荧光光谱学
·
超分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yifei Xing,Song Shen,Zhenguang Wang
Direct fluorescence detection of amoxicillin (AMX) is highly desired for food and environment safety but remains a formidable challenge because of its low conjugation degree and stabilization effects on excitons. In this work, we proposed a direct fluorometry for AMX through modulating its fluorescence properties by utilizing sulfur nanodots (S-dots) as nanoreactors. S-dots provided both confined carrier and reactants (polyethylene glycol (PEG) and sulfite ions) to modulate the fluorescence properties of AMX, achieving a 277-fold increase on the fluorescence intensities. PEG and SO 3 2- interacted with AMX through both covalent and hydrogen bounds, which stabilized the excited states, decreased the chances of nonradiative path and activated the radiative decay. The ultrasmall sized S-dots also provided confinement carries for promoting the reactivity between AMX and surface function groups. Quantitative detection of AMX in commercial milk samples was realized through direct recording the fluorescence signals, achieving a limit of detection of 159 nM. The reported results provided a new idea to design fluorescence assays for extremely weak emissive molecules, showing great potential in food safety analysis, environmental and healthy monitoring.
研究领域:
分析化学
·
纳米技术
·
食品安全
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Zheng Yin,Zhu Wu,Bin Liu
Organic room-temperature phosphorescence (RTP) materials with large Stokes shifts and prolonged afterglows are gaining increasing attention in a variety of applications, including displays, anti-counterfeiting, sensing, and bioimaging. However, achieving high-performance organic RTP remains challenging due to weak spin-orbit coupling, rapid non-radiative decay, and unstable triplet excitons. Early studies focused on crystal engineering, as ordered lattices restrict molecular motion and stabilize triplet excitons. Analyzing crystal structures and packing provides valuable insights into intermolecular interactions, while theoretical calculations have clarified electronic structures, laying the foundation for rational RTP material design. However, recent findings suggest RTP in many single-component systems may arise from trace impurities, significantly influencing RTP properties. This discovery has greatly advanced the understanding of impurity-induced phosphorescence. This review systematically examines the role of impurities in RTP, detailing their origins from starting materials, solvents, and side reactions. It also explores how these identified impurities can serve as essential building blocks for designing new RTP materials. Finally, essential methods for evaluating compound purity, emphasizing the critical importance of rigorous analysis and validation are presented. Material purity plays a pivotal role in RTP research, as impurities can distort experimental data, potentially leading to misinterpretations that can impede advancements in understanding the underlying mechanisms.
研究领域:
材料科学
·
光物理
·
有机电子学
·
光学材料
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-9
·
IF 4.259
Zhang Song,Sun Simei,Zhou Miaomiao,Wang Lian,Zhang Bing
We investigated the mechanism of intramolecular charge transfer and the following radiationless dynamics of the excited states of 1-aminoanthraquinone using steady state and time-resolved absorption spectroscopy combined with quantum chemical calculations. Following photoexcitation with 460 nm, conformational relaxation via twisting of the amino group, charge transfer and the intersystem crossing (ISC) processes have been established to be the major relaxation pathways responsible for the ultrafast nonradiative of the excited S 1 state. Intramolecular proton transfer, which could be induced by intramolecular hydrogen bonding is inspected and excluded. Time-dependent density functional theory (TDDFT) calculations reveal the change of the dipole moments of the S 0 and S 1 states along the twisted coordinate of the amino group, indicating the mechanism of twisted intra-molecular charge transfer (TICT). The timescale of TICT is measured to be 5 ps due to the conformational relaxation and a barrier on the S 1 potential surface. The ISC from the S 1 state to the triplet manifold is a main deactivation pathway with the decay time of 28 ps. Our results observed here have yield a physically intuitive and complete picture of the photoinduced charge transfer and radiationless dynamics in anthraquinone pharmaceutial products.
研究领域:
物理化学
·
光化学
·
光谱学
·
理论化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 9
·期 4
·1279-1286
·
IF 7.059
Youde Chen,Peng Lu,Qin Gui,Zhiyan Li,Yongjie Yuan,Hailiang Zhang
Realizing a larger luminescence asymmetry factor (glum) and a higher solid-state luminescence quantum yield are vital for promoting the application of circularly polarized luminescence (CPL) materials; however, they are challenging to achieve. This study utilizes the chirality amplification effect from chiral liquid crystals and the intense solid-state emission feature from aggregation-induced emission enhancement (AIEE) fluorophores to generate a high efficiency CPL-active chiral luminescent liquid crystal (NO2-CS-C6-Chol). During annealing, cholesteric phase, chiral smectic C (SmC*) phase and crystalline phase were observed successively. To suppress the strong thermo-activated nonradiative decay, we froze the assembly structure of the cholesteric phase and SmC* phase with liquid nitrogen. As a result, the cholesteric film (State C), SmC* film (State B) and crystalline film (State A) stable at room temperature were obtained. The study focuses on the photophysical properties in different phase state films, particularly the impact of phase structures on the properties of CPL. The results show that NO2-CS-C6-Chol presented a large glum value and excellent fluorescence efficiencies in State C and B, while no CPL signal was detected in State A. Based on the thermo-driven phase transition feature of NO2-CS-C6-Chol, CPL can switch from one state to the other two states at our will, indicating the significant manipulation effect of phase structures on the CPL properties. This work is conducive to deeply understand the generation and amplification mechanisms of chirality.
研究领域:
材料科学
·
光学
·
化学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Menglong Liu,Naizhong Jiang,Hai Huang,Jidong Lin,Feng Huang,Yongping Zheng,Daqin Chen
Room temperature phase instability of cubic CsPbI 3 perovskite nanocrystals is one of the notorious limitations for practical applications in optoelectronic fields. Herein, the incorporation of Ni 2+ ions into CsPbI 3 lattice was successfully achieved by a modified hot-injection method using nickel acetate as doping precursor. The as-prepared Ni 2+ (3.3 mol%): CsPbI 3 nanocrystals exhibited an improved, near-unity (95%~100%) photoluminescence quantum yield owing to the enhanced radiative decay rate and the decreased non-radiative decay rate. Additionally, Ni-doping was demonstrated to stabilize CsPbI 3 lattice and the Ni 2+ : CsPbI 3 film and colloidal solution can retain their red luminescence up to 15 days and 7 months in atmosphere, respectively. First-principle calculations verified that the significantly improved optical performance and stability of Ni 2+ : CsPbI 3 nanocrystals arose primarily from the increased formation energy due to the successful doping of Ni 2+ in CsPbI 3 . Benefiting from such an effective doping strategy, the as-prepared Ni 2+ -doped CsPbI 3 perovskite nanocrystals can function well as efficient red-light emitter toward the fabrication of high-performance perovskite LED with a peak external quantum efficiency of ~7%.
研究领域:
材料科学
·
光电技术
·
纳米技术
·
光子学
✓ 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）