- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
A 1,8 Naphthalimide anchor Rhodamine B Based FRET Probe for Ratiometric Detection of Cr3+ion in Living Cells
摘要： A 2-(1,3-dioxo-1H-benzo[de]isoquinolin-2(3H)-yl)acetaldehydeanchored rhodamine B based probe, RDNAP detects Cr3+ ion by fluorescence resonance energy transfer (FRET) process in aqueous buffered acetonitrile media (7:3, v/v). Conversely, conjugation of 2-(1,3-dioxo-6-(piperidin-1-yl)-1H-benzo[de]isoquinolin-2(3H)-yl)acetaldehyde with rhodamine B provides another probe, RDNAP-PY that undergoes Cr3+assisted ratiometric fluorescence and colorimetric change in the same media. RDNAP-PY provides higher FRET efficiency and detects as low as 1.81×10?6 M Cr3+with an association constant, 15.9 × 104 M-1. Other common ions do not interfere. RDNAP-PY efficiently images intracellular Cr3+ in live Hep3B, MCF-7, HeLa, SiHa and HEK 293T cells under fluorescence microscope in a ratiometric and time dependent manner. 1H NMR titration and DFT studies strongly support experimental findings.
关键词： 1,8 Naphthalimide,Live cell imaging,Ratiometric probe,fluorescence resonance energy transfer,DFT calculation
更新于2025-09-09 09:28:46
-
High Performance Thermally Activated Delayed Fluorescence Sensitized Organic Light‐Emitting Diodes
摘要： Recently, organic light-emitting diodes (OLEDs) employing thermally activated delayed fluorescence (TADF) materials have aroused huge attention in both academia and industry. Compared with fluorescent and phosphorescent materials, TADF materials can theoretically capture 100 % excitons without incorporating noble metals, making them effective emitters and hosts for OLEDs simultaneously. Here, in this review, our recent works on mechanisms and materials of high performance TADF-sensitized phosphorescent (TSP) OLEDs, TADF-sensitized fluorescent (TSF) OLEDs and TADF-sensitized TADF (TST) OLEDs are summarized. Finally, we propose the outlook for the further development and application of TADF-sensitized OLEDs.
关键词： bipolar host,Dexter energy transfer,organic light-emitting diodes,F?rster energy transfer,thermally activated delayed fluorescence
更新于2025-09-04 15:30:14
-
Er3+-to-Yb3+ and Pr3+-to-Yb3+ energy transfer for highly efficient near-infrared cryogenic optical temperature sensing
摘要： Here, the very high thermal sensing capability of Er3+,Yb3+ doped LaF3 nanoparticles, where Er3+-to-Yb3+ energy transfer is used, are reported. Also Pr3+,Yb3+ doped LaF3 nanoparticles, with Pr3+-to-Yb3+ energy transfer, showed temperature sensing in the same temperature regime, but with lower performance. The investigated Er3+,Yb3+ doped LaF3 nanoparticles show a remarkably high relative sensitivity Sr up to 6.6092 %K-1 (at 15K) in the near-infrared (NIR), in the cryogenic (15 – 105K) temperature region opening a whole new thermometric system suitable for advanced applications in the very low temperature ranges. Up to date reports on NIR cryogenic sensors are very scarce.
关键词： near-infrared,Pr3+-to-Yb3+ energy transfer,Er3+-to-Yb3+ energy transfer,LaF3 nanoparticles,cryogenic temperature sensing
更新于2025-09-04 15:30:14
-
Weak measurement and weak values — New insights and effects in reflectivity and scattering processes
摘要： Recently, the notions of Weak Measurement (WM), Weak Value (WV) and Two-State-Vector Formalism (TSVF), firstly introduced by Aharonov and collaborators, have extended the theoretical frame of standard quantum mechanics, thus providing a quantum-theoretical formalism for extracting new information from a system in the limit of small disturbance to its state. Here we provide an application to the case of two-body scattering with one body weakly interacting with its environment — e.g. a neutron being scattered from a H2 molecule physisorbed in a carbon nanotube. In particular, we make contact with the field of incoherent inelastic neutron scattering from condensed systems. We provide a physically compelling prediction of a new quantum effect — a momentum transfer deficit; or equivalently, an enhanced energy transfer; or an apparent reduction of the mass of the struck particle. E.g., when a neutron collides with a H2 molecule in a C-nanotube and excites its translational motion along the nanotube, it apparently exchanges energy and momentum with a fictitious particle with mass of 0.64 atomic mass units. Experimental results are shown and discussed in the new theoretical frame. The effect under consideration has no conventional interpretation, thus also supporting the novelty of the quantum theoretical framework of WV and TVSF. Some speculative remarks about possible applications being of technological interest (fuel cells and hydrogen storage; Li+ batteries; information and communication technology) are shortly mentioned.
关键词： energy transfer,mass reduction,neutron scattering,momentum transfer deficit,Two-State-Vector Formalism,Weak Value,Weak Measurement
更新于2025-09-04 15:30:14
-
Modulation of Excited‐State Proton Transfer Dynamics Inside the Nanocavity of Microheterogeneous Systems: Microenvironment‐Sensitive F?rster Energy Transfer to Riboflavin
摘要： Excited-state proton transfer (ESPT) in a tetraarylpyrene derivative, 1,3,6,8-tetrakis(4-hydroxy-2,6-dimethylphenyl)pyrene (TDMPP), was investigated thoroughly in the presence of various surfactant assemblies such as micelles, vesicles, etc. The surfactants can significantly retard the extent of excited-state proton transfer process, resulting in a distinguishable optical signal compared to that in the bulk medium. Physical characteristics of the surfactant assemblies such as order, interfacial hydration and surface charge influence the proton transfer process, and allow multiparametric sensing. A higher degree of interfacial hydration facilitates the proton transfer process, while the positively charged head groups of the surfactants specifically stabilize the anionic form of the probe (TDMPP-O*). Further, Forster energy transfer from the probe to riboflavin was studied in phospholipid membrane, wherein the relative ratio of neutral vs anionic forms (TDMPP-OH/TDMPP-O*) was found to influence the extent of energy transfer. Overall, we demonstrate how an ultrafast photophysical process, that is, the excited-state proton transfer, can be influenced by microenvironment.
关键词： surfactants,Excited-state proton transfer,Energy transfer,microheterogeneous system,microenvironment
更新于2025-09-04 15:30:14
-
Photon Upconverted Circularly Polarized Luminescence via Triplet-Triplet Annihilation
摘要： Circularly polarized luminescent materials are of increasing attention due to their potential applications in advanced optical technologies, such as chiroptical devices and optical sensing. Recently, in all reported circularly polarized luminescent materials, high-energy excitation results in low-energy or downconverted circularly polarized luminescence (CPL) emission. Although photon upconversion—i.e., the conversion of low-energy light into higher-energy emission, with a wide variety of applications—has been widely reported, the integration of photon upconversion and CPL in one chiral system to achieve higher-energy CPL emission has never been reported. Herein, a brief review is provided of recent achievements in photon-upconverted CPL via the triplet–triplet annihilation mechanism, focusing on the amplified dissymmetry factor glum through energy transfer process and dual upconverted and downconverted CPL emission through chirality and energy transfer process.
关键词： triplet–triplet annihilation,photon upconversion,energy transfer,triplet energy migration,circularly polarized luminescence
更新于2025-09-04 15:30:14
-
Probing Energy Migration through Precise Control of Interfacial Energy Transfer in Nanostructure
摘要： A novel mechanistic strategy for probing the energy migration through constructing the interfacial energy transfer (IET) in a core–shell–shell nanostructure is reported. In this design, the trilayer nanostructure is composed of a sensitizing core, a migratory interlayer, and a detective shell layer that interact with each other only by IET and the latter two shell layers are nonresponsive to the incident irradiation. This model is well applied in investigating the energy migration over the Tb, Gd, and Yb sublattices, and the results show that the Gd sublattice holds the best energy migratory performance. Moreover, the finding of energy migration over the Yb sublattice enables the 808 nm excited long-lived upconversion of Tb3+ and Eu3+, which exhibits unique time-gating performance for information security. The results provide a facile and powerful nanosized model for an in-depth understanding of the fundamentals involving lanthanide interactions, which will further help excite new chances for the frontier applications of lanthanide-based luminescent materials.
关键词： mechanistic study,core–shell–shell nanostructure,energy migration,interfacial energy transfer
更新于2025-09-04 15:30:14
-
Enhancement of Red Upconversion Emission of LiGdF <sub/>4</sub> :Yb <sup>3+</sup> /Ho <sup>3+</sup> Nanorods by Doping with Ce <sup>3+</sup>
摘要： A series of tetragonal phase LiGdF4:Yb3+/Ho3+ nanorods tri-doped with Ce3+ have been successfully prepared via a facile oil heated method at 200 °C. The visible green and red upconversion emissions have been achieved and the red emission intensity is enhanced gradually with increasing Ce3+ concentration. The ratio of red to green emission of the Ho3+ ions is boosted about 20-fold due to efficient cross relaxation processes between Ho3+ and Ce3+ ions, which promote the red emission and weaken the green emission. The crystal phase and morphology of the nanorod samples were inspected by X-ray diffraction and transmission electron microscopy, respectively. This work has great potential applications in the biological imaging, biomedical and color display applications.
关键词： Energy Transfer,Upconversion Luminescence,Nanorods LiGdF4
更新于2025-09-04 15:30:14
-
Effect of an underdamped vibration with both diagonal and off‐diagonal exciton–phonon interactions on excitation energy transfer
摘要： A numerically exact approach, named as the hierarchical stochastic Schr?dinger equation, is employed to investigate the resonant vibration-assisted excitation energy transfer in a dimer system, where an underdamped vibration with both diagonal and off-diagonal exciton–phonon interactions is incorporated. From a large parameter space over the site-energy difference, excitonic coupling, and reorganization energy, it is found that the promotion effect of the underdamped vibration is significant only when the excitonic coupling is smaller than the site-energy difference. Under the circumstance, there is an optimal strength ratio between diagonal and off-diagonal exciton–phonon interactions for the resonant vibration-assisted excitation energy transfer as the site-energy difference is greater than the reorganization energy, whereas in the opposite situation the most efficient energy transfer occurs as the exciton–phonon interaction is totally off-diagonal.
关键词： underdamped vibration,energy transfer,exciton–phonon interaction,non-Condon effect
更新于2025-09-04 15:30:14
-
[Springer Theses] The Electronic Transitions of Molecular Oxygen || Temperature Effects on the Lifetime of O2(a1Δg)
摘要： The non-radiative deactivation of O2(a1(cid:2)g) and O2(b1(cid:3) + g) by solvent molecules has been a topic of intense and extensive research for almost half a century. The seminal interest derived in part from an unusually large effect of solvent and solvent deuteration on the lifetime of O2(a1(cid:2)g). The lifetime of O2(a1(cid:2)g), τ (cid:2), varies by 5 orders of magnitude in different solvents, and differences between H/D-isotopologues of the same solvent often exceed a factor of 20. The early reports on the subject were based on indirect probe-based measurements of τ (cid:2). Therefore, the interpretations were often misguided and afforded considerable controversy. With the advent of fast near-IR sensitive detectors in the late 1970s, it became possible to detect O2(a1(cid:2)g) phosphorescence with time-resolution. This facilitated the recording of an increasingly accurate set of data, which in turn, led to the development of ever more sophisticated theories. This effort culminated in the 1990’s with the development of an empirical model of electronic-to-vibrational (e-to-v) energy transfer. This model, which by now is widely accepted, focusses on the solvent as a “vibrational energy sink” that accept the excitation energy of O2(a1(cid:2)g) and O2(b1(cid:3) + g). In particular, the model accounts nicely for H/D solvent isotope effects on τ (cid:2) that are signi?cantly different from those observed on τ (cid:3). Nevertheless, as we shall see in the present chapter, it still has some important limitations.
关键词： electronic-to-vibrational energy transfer,solvent molecules,temperature effects,O2(a1(cid:2)g),non-radiative deactivation
更新于2025-09-04 15:30:14