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Intermolecular vibrational energy transfer enabled by microcavity strong lighta??matter coupling
摘要： Selective vibrational energy transfer between molecules in the liquid phase, a difficult process hampered by weak intermolecular forces, is achieved through polaritons formed by strong coupling between cavity photon modes and donor and acceptor molecules. Using pump-probe and two-dimensional infrared spectroscopy, we found that the excitation of the upper polariton, which is composed mostly of donors, can efficiently relax to the acceptors within ~5 picoseconds. The energy-transfer efficiency can be further enhanced by increasing the cavity lifetime, suggesting that the energy transfer is a polaritonic process. This vibrational energy-transfer pathway opens doors for applications in remote chemistry, sensing mechanisms, and vibrational polariton condensation.
关键词： intermolecular interactions,strong light–matter coupling,polaritons,microcavity,vibrational energy transfer
更新于2025-09-23 15:21:01
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Effect of P-to-Rare Earth Atomic Ratio on Energy Transfer in Er-Yb-Doped Optical Fiber
摘要： Erbium (Er)- and Ytterbium (Yb)-doped optical fibers (EYDFs) have been used in various industrial fields as the only technology suitable for >1 W high-power amplifiers in the 1550-nm band. The output power is mainly limited by unwanted 1-μm band amplified spontaneous emissions from excited Yb3+; however, the factors affecting the output performance remain unclear. Here, we quantitatively and systematically reveal that the Phosphorus (P)-to-rare earth atomic ratio in the EYDFs has an optimal value for achieving the best output performance of EYDFs. We experimentally evaluated the quantitative relationship among co-dopants by fabricating preforms, drawing them as fibers, and measuring the amplification characteristics. At an appropriate Er concentration (0.3–0.5 wt %), a pump-to-signal conversion efficiency of 45.4% was obtained when the P/(Yb + Er) atomic ratio was around 25. This study paves the way for energy saving in high-power applications, such as high-speed optical wireless communication and long-distance optical ranging.
关键词： Phosphorus,Atomic ratio,Space communications,Energy-transfer efficiency,Amplified spontaneous emission,Erbium-Ytterbium-doped optical fiber amplifiers
更新于2025-09-23 15:21:01
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Phototuning Energy Transfer in Self-Organized Luminescent Helical Superstructures for Photonic Applications
摘要： Stimuli-triggered changes in the emission color of functional materials are in demand for a variety of potential applications. Herein, a strategy to reversibly phototune fluorescence color in cholesteric liquid crystal (CLC) with self-organized luminescent helical superstructure via fluorescence resonance energy transfer (FRET) is developed. This dynamic FRET system is constructed by doping with 1,2-dithienyldicyanoethene-based chiral fluorescent photoswitch (switch 7) as an acceptor and a conventional coumarin dye C6 as a donor into a nematic liquid crystal (LC) host. The efficient energy transfer from C6 to switch 7 in the LC media, which is evidenced by both of emission color shift and enhanced circularly polarized luminescence, can be modulated on the basis of reversible trans–cis photoisomerization of switch 7 upon visible/UV light irradiations, leading to the emission color change from orange to green. Noteworthily, the FRET efficiency can be significantly improved when CLCs are confined in the polymer microtubes. Preliminary demonstrations of the LC film and LC microtubes array for information display and encryption with ease of electrical operation between planar, homeotropic, and focal conic states or light manipulation are described.
关键词： cholesteric liquid crystals,optically and electrically tunable fluorescence patterns,displaying and encrypting,phototuning energy transfer,polymer microtubes
更新于2025-09-23 15:21:01
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Paper-Based Constant Potential Electrochemiluminescence Sensing Platform with Black Phosphorus as a Luminophore Enabled by a Perovskite Solar Cell
摘要： Exploring e?cient luminophores in the electrochemiluminescence (ECL) system is highly desired to pursue a sensitive ECL sensing platform. Herein, the black phosphorus nanosheets (BP NSs) with excellent ECL properties are investigated and serve as the luminophore with the coreactant of peroxydisulfate (S2O8 2?) solution. Moreover, owing to the overlapping of emission and absorbance spectra, e?ective resonance energy transfer (RET) is realized between the BP NSs and the introduced Au nanoparticles. In order to achieve the portable and miniaturized developing trends for the paper-based ECL sensing platform, a paper-based perovskite solar cell (PSC) device is designed to act as the power source to replace the commonly utilized expensive and cumbersome electrochemical workstation. Bene?ting from that, a PSC driven paper-based constant potential ECL-RET sensing platform is constructed, thereby realizing sensitive microRNAs (miRNAs) detection. What’s more, to attain the preferable analytical performance, the duplex-speci?c nuclease (DSN) is also introduced to assist the target recycling signal ampli?cation strategy. Based on this, highly sensitive detection of miRNA-107 with a range from 0.1 pM to 15 nM is achieved by this designed sensing platform. Most importantly, this work not only pioneers a precedent for developing a high-sensitivity PSC triggered ECL sensing platform but also explores the application prospect of BP nanomaterial in the ?eld of bioanalysis.
关键词： microRNAs detection,resonance energy transfer,perovskite solar cell,black phosphorus nanosheets,electrochemiluminescence
更新于2025-09-23 15:21:01
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Highly Efficient Energy Transfer from Water Soluble Zinc Silver Indium Sulphide Quantum Dot to Organic J-Aggregates
摘要： The present work has been carried out with an aim to design and develop an efficient light harvesting inorganic-organic hybrid nanoscale material by employing less toxic, environment friendly inorganic substance and also to understand the mechanism of inter-particle electronic interaction between the inorganic and organic components of the nanomaterial. Specifically, the inorganic-organic hybrid associate has been made by integrating water soluble semiconductor QDs (Zinc-silver-indium-sulfide (ZAIS)) and organic J-aggregates of a cyanine dye (S2165). The fabrication of present nano-hybrid system has been achieved via electrostatically driven self-assembly of organic dyes over ZAIS QDs. The interaction between QD and J-aggregates have been investigated by steady state and time resolved fluorescence measurements. Zeta potential measurements have also been performed to understand the role of electrostatic interaction and thermodynamic feasibility of the association process. The investigations have revealed that energy transfer (ET) process between QD and J-aggregates mediated through dipole-dipole mechanism. Interestingly, data analysis based on F?rster theory has further revealed that the ET from QD to J-aggregates is very high indicating efficient electronic coupling between the inorganic QD and the organic J-aggregates. Zeta potential measurements and thermodynamic calculations have demonstrated that the interaction between QD and organic dye is electrostatically driven and the association of organic dyes over QD is thermodynamically feasible. The outcome of the present study is expected to be helpful in designing efficient nanoscale light harvesting devices. Additionally, fluorescence microscopy and toxicity studies on the QDs have also shown its suitability for biological applications.
关键词： energy transfer,fluorescence microscopy,electrostatic interaction,J-aggregates,inorganic-organic hybrid,toxicity studies,quantum dots
更新于2025-09-23 15:21:01
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Tunable photoluminescence and energy transfer of novel phosphor Sr9La2W4O24:Sm3+, Eu3+ for near-UV white LEDs
摘要： Novel Sr9La2W4O24:xSm3+ and Sr9La2W4O24:0.15Sm3+, yEu3+ orange-red phosphors with double perovskite tungsten structure are synthesized by high-temperature solid-phase reaction method. X-ray diffraction patterns indicate the prepared phosphors are pure phase with a tetragonal structure and the SEM image displays the long string structure with a diameter of one micron. Under the excitation of near-UV light, the Sm3+ and Eu3+ ions activated Sr9La2W4O24 phosphors exhibit their characteristic emissions in the orange-red region, and the emitting light color of the Sr9La2W4O24:0.15Sm3+, yEu3+ phosphors can be adjusted from orange to red by increasing the concentration of Eu3+ ions implying their potential applications as orange-red emitting phosphor for LED in solid-state lighting. The optimal doping concentration of Sm3+ ions in Sr9La2W4O24:xSm3+ phosphors is around 15?mol%. The energy transfer from Sm3+ to Eu3+ is discussed and the major mechanism for concentration quenching is the dipole–dipole (d–d) interaction.
关键词： Sm3+,phosphors,energy transfer,double perovskite,Eu3+,white LEDs
更新于2025-09-23 15:21:01
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The Balance between Energy Transfer and Exciton Separation in Ternary Organic Solar Cells with Two Conjugated Polymer Donor
摘要： Ternary strategy as a straightforward way for organic solar cells (OSCs) to improve the device performance attracts many interests in the field. The ternary strategy usually focuses on processing the third light-absorbing material owning a complementary absorption to the binary system. However, studying the third component with similar absorption spectra to the binary counterpart is equally essential to understand the in-depth mechanism of the performance improvement from the third component. In this work, we filled up this blank and derived a type of ternary device consisting of two conjugated polymer donor materials of PTB7-Th and PffBT4T-2OD and non-fullerene acceptor material of IEICO-4F. The average PCE value of the optimized ternary device reached 12.1%, which is around 16% higher than its PTB7-Th:IEICO-4F binary counterpart. Even the third component of PffBT4T-2OD containing a similar absorption spectrum with PTB7-Th, it was found that the Jsc increase contributes to the primary performance enhancement. Further investigations indicate that the Jsc increase in the optimized ternary device mainly came from the improved light absorption ability, current extraction process, charge transport process, and suppressed non-radiative recombination. Moreover, there is a balance found between the exciton separation process and the energy transfer process when optimizing ternary blend ratios. The optimized ternary device is suspected to reach this balance point and thus exhibits the enhancement in device performance. Morphology investigation reveals that the addition of PffBT4T-2OD can tune the morphology and increase the crystallinity in the active layer. The optimized ternary blend shows a well-mixed donor and acceptor morphology with small domain size and slightly increased crystallization, which further explained its best device performance.
关键词： non-fullerene,energy transfer,exciton separation,organic solar cells,ternary,crystallization,conjugated polymer
更新于2025-09-23 15:21:01
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Photoluminescence properties and energy transfer investigations of Gd3+ and Sm3+ co-doped ZnOa??BaOa??TeO2 glasses for solid state laser application
摘要： The physical, optical, photoluminescence properties of (54-x) TeO2 – 10ZnO – 35BaO –1Sm2O3 – xGd2O3, where 0 ≤ x ≤ 3 (mol %) are investigated in this research. Five samples of glass were produced by the normal melt quenching process. The evidence indicates that the density of glass increased with increasing of Gd2O3. The molar volume and refractive index investigations have been used to consider the physical properties and optical properties of the produced glass system. Physical parameters such as polaron radius, inter-ionic radius and field strength for Sm3+/Gd3+ ions have been evaluated. The absorption spectra of glass contain peaks at 358, 404, 948, 1,085, 1,235, 1,385, 1,490 and 1535 nm corresponding to the transitions from 6H5/2 to 4D3/2, 6P3/2, 6F11/2, 6F9/2, 6F7/2, 6F5/2, 6F3/2, and 6H15/2, respectively. The emission spectra of glass show four bands at found and attributed to 563, 604, 646 and 709 nm by excitation at 275 nm. Judd-Ofelt parameters and radiative properties was investigated for 53.5TeO2 – 10ZnO – 35BaO – 1Sm2O3 – 0.5Gd2O3 glass. Energy transfer characteristics was observed in the present glasses. The emission intensity of Sm3+ increased with increasing of Gd2O3 concentration until 2 mol %, while the luminescence lifetime decreases with increasing of Gd2O3 content.
关键词： Sm3+ ion,Tellurite glass,Gd3+ ion,Energy transfer
更新于2025-09-23 15:21:01
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Synthesis and photoluminescence properties of Ln3+ (Ln3+= Sm3+/Eu3+) doped Na2NbAlO5 phosphors
摘要： A series of Ln3+ (Ln3+=Sm3+/Eu3+) ions doped Na2NbAlO5 phosphors have been synthesized by solid-state method. Sm3+ and Eu3+ ion doped phosphors are characterized by SEM, XRD, EDX, photoluminescence, decay and thermal stability profiles. The Ln3+-doped samples are consistent with the pure Na2NbAlO5 phase which were analyzed by the X-ray diffraction result. SEM results showed the homogeneous aggregates and particles size of Sm3+ (0.6-0.9μm) and Eu3+ (0.2-0.3μm) doped Na2NbAlO5. From EDX diagram, the samples are consisted of Na, Nb, Al, O and Sm ,or Eu elements.With the introduction of Eu3+ ions, the decay curves of Sm3+ decreases monotonically, which supports the occurrence of the energy transfer from Sm3+ to Eu3+ in Na2NbAlO5 host. The fluorescence lifetime decreases with increasing temperature . The energy transfer mechanisms of Sm3+ and Eu3+ doped Na2NbAlO5 have been investigated and can be derived to be electric dipole-dipole and diopole-quadrupole interactions, respectively. In addition, the temperature-dependent emission spectra of Sm3+/Eu3+ doped Na2NbAlO5 phosphors possess superior thermal stability. Under the ultraviolet light, the prepared Na2-xNbAlO5: xLn3+ (Ln3+= Sm3+/Eu3+) phosphors show the characteristic orange (Sm3+), red (Eu3+) emissions respectively. The obtained results suggest that the new Na2NbAlO5:xLn3+ (Ln3+= Sm3+/Eu3+) phosphors are promising candidates for white light-emitting diodes.
关键词： Photoluminescence,White LEDs,Energy transfer,Na2NbAlO5
更新于2025-09-23 15:21:01
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A new nano biosensor for maitotoxin with high sensitivity and selectivity based fluorescence resonance energy transfer between carbon quantum dots and gold nanoparticles
摘要： Maitotoxin (MTX) is a potent marine toxin with critical LD50, which usually causes poisoning because of eating the contaminated marine crustaceans. This poison is a severe threat to neuronal systems and also disables the heart by increasing the calcium ions flow in the cardiovascular. Therefore, the quantitative determination of MTX by using a fast and cost-effective way is essential. Application of carbon dots in the structure of various sensors for the measurement of biological compounds has been developed due to its easy, rapid and inexpensive synthesis. In this study, carbon quantum dots (CQDs) and gold nanoparticles (AuNPs) were synthesized for the determination of MTX with high sensitivity and selectivity. The structure of CQDs and AuNPs were characterized using SEM (Scanning electron microscopy), TEM (Transmission electron microscopy), EDS (Energy-dispersive X-ray spectroscopy) and FT-IR (Fourier-transform infrared spectroscopy) techniques. The Basis of the sensing method is fluorescence resonance energy transfer (FRET) which occurs between energy donor (CQDs) and energy acceptor (AuNPs). Under optimal conditions (excitation wavelength 430 nm and emission wavelength 523 nm), the linear range and detection limit were obtained 1-600 pmol L-1 and 0.3 pmol L-1, respectively. The strong point of this nanosensor is its very fast quenching process. The interference effect of other poisons and some ions on the MTX determination were investigated using CQDs at the constant concentration of MTX 50 pmol L-1 and various concentrations of other species. The results show excellent selectivity for the measurement of MTX in the presence of other similar species.
关键词： Gold nanoparticles,Fluorescence Resonance Energy Transfer,Maitotoxin,Carbon Quantum Dots
更新于2025-09-23 15:21:01