AI Article Synopsis
- Researchers used a finely-tuned optical microresonator to control how a single molecule emits light, specifically by measuring its fluorescence lifetime.
- Changing the length of the cavity alters the surrounding electromagnetic field, affecting how efficiently the molecule radiates energy.
- By analyzing the experimental results alongside a theoretical model, they found significant variations in the quantum yield of different molecules due to differences in their interactions with the surrounding environment.*
Article Abstract
Using a tunable optical microresonator with subwavelength spacing, we demonstrate controlled modulation of the radiative transition rate of a single molecule, which is measured by monitoring its fluorescence lifetime. Variation of the cavity length changes the local mode structure of the electromagnetic field, which modifies the radiative coupling of an emitting molecule to that field. By comparing the experimental data with a theoretical model, we extract both the pure radiative transition rate as well as the quantum yield of individual molecules. We observe a broad scattering of quantum yield values from molecule to molecule, which reflects the strong variation of the local interaction of the observed molecules with their host environment.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/nl200215v | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Why do similar 1D-polyhedron-chain copper chloride semiconductors have 2-order-distinct luminescence quantum efficiencies?
J Chem Phys
December 2024
Key Laboratory of Quantum Materials and Devices of Ministry of Education, School of Physics, Southeast University, Nanjing 211189, People's Republic of China.
The "green" copper halides with one-dimensional polyhedron chains are very interesting novel semiconductors. These weakly interacting parallel quantum wires (1D polyhedron chains) play key roles in their photophysical properties. Unlike Cs3Cu2I5, which has been much investigated, its homologous compounds Cs3Cu2Cl5 and CsCu2Cl3 remain less studied and their properties are controversial.
View Article and Find Full Text PDFPreparation of cellulose-based fluorescent aggregations with various morphologies and their microstructure-correlated fluorescence behavior.
Int J Biol Macromol
December 2024
School of Textile Science and Engineering, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, China; Key Laboratory of Functional Textile Material and Product, Xi'an Polytechnic University, Ministry of Education, Xi'an 710048, Shaanxi, China. Electronic address:
We provided an efficient method for preparing fluorescent materials with high specificity. Firstly, the cellulose-based aggregations with adjustable morphologies and sizes were obtained by cross-linking copolymerization and self-assembly. Then, after encapsulating the fluorescein isothiocyanate (FITC) into the hydrophobic microregions of the cellulose-based aggregations by ultrasound/dialysis method, a series of cellulose-based fluorescent aggregations with different morphologies was obtained.
View Article and Find Full Text PDFLarge Scale Synthesis of Red-Emitting Quantum Dots for Efficient and Stable Light-Emitting Diodes.
Adv Mater
December 2024
Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University (PolyU), Hung Hom, Hong Kong, P. R. China.
It is known that large-scale synthesis of emitters affords colloidal quantum dot (CQD) materials with a great opportunity toward the mass production of quantum dot light-emitting diodes (QLEDs) based commercial electronic products. Herein, an unprecedented example of scalable CQD (> 0.5 kilogram) is achieved by using a core/shell structure of CdZnSe/ZnSeS/CdZnS, in which CdZnSe, ZnSeS, and CdZnS alloys are used as the inner core, transition layer and outermost shell, respectively.
View Article and Find Full Text PDFSpectroscopic studies and Non-Linear optical response through C/N replacement and modulation of electron Donor/Acceptor Units on naphthyridine derivatives.
Spectrochim Acta A Mol Biomol Spectrosc
December 2024
Institute of Chemistry, The Islamia University of Bahawalpur, Baghdad-ul-Jadeed Campus, Bahawalpur 63100, Pakistan.
This study explores the nonlinear optical (NLO) and photophysical properties of newly designed naphthyridine derivatives by density functional theory (DFT). The first hyperpolarizability (β), a key indicator of NLO activity, varies significantly depending on the substituent groups. N-substituted compounds (IUB-N series) generally show lower β values, while compounds with electron donor/acceptor groups (IUB-P series) demonstrate a broader range, with IUB-A-02 achieving the highest β value of 16,362 a.
View Article and Find Full Text PDFEnhancement of Sm Luminescence in Sol-Gel Silica Matrix: Effect of Ligands Phenyl Phosphinic Acid and Trioctylphosphine Oxide.
J Fluoresc
December 2024
Department of Physics, Dibrugarh University, Dibrugarh, 786004, Assam, India.
Sol-gel silica matrices singly doped with Sm and co-doped with ligands phenyl phosphinic acid (PPIA) and trioctylphosphine oxide (TOPO) were fabricated and studied for their structural and spectroscopic behaviour. Structural studies were done by x-ray diffraction (XRD) and Fourier transform infra-red (FTIR) absorption analysis whereas spectroscopic behaviour was studied by ultraviolet - visible (UV-Vis) absorption, photoluminescence (PL) excitation, emission and time-correlated decay analyses. XRD studies exhibit the amorphous nature of the samples and FTIR studies corroborate the presence of the ligands in the silica matrix.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!