The synthesis and characterizations of two new complexes, [Sm(btfa)Cl-terp] (SmCHFONCl) and [Eu(btfa)Cl-terp] (EuCHFONCl) were done successfully. The complexes have nona-coordinate Sm and Eu centres coordinated to six oxygen atoms of benzoyltrifluoro acetone (btfa) and three nitrogen atoms of chloro-terpyridine (Cl-terp). The ground state geometry of both complexes was optimized using the sparkle model and the shape analysis was carried out using SHAPE v2.1. The detailed photophysical properties of the complexes were studied in solution, solid and 5 % PMMA thin film. The emission spectra of the complexes are devoid of any ligand fluorescence that marks the utilized organic ligands as efficient sensitizers. The decay time and absolute quantum yield of the Sm complex show 12- and 7-fold increase than its precursor [Sm(btfa)(HO)]. The longer decay time of 93 µs is higher than most of the reported trivalent samarium β-diketonate complexes. The Judd-Ofelt intensity parameters, radiative and non-radiative rate constants, intensity ratio, radiative and experimental lifetime, absolute as well as intrinsic quantum yield and sensitization efficiency were calculated and analysed for Eu complex. The decay time, absolute quantum yield and intrinsic quantum yield of [Eu(btfa)Cl-terp] are 3-, 15- and 3-times larger than precursor, [Eu(btfa)(HO)]. The energy transfer from organic sensitizers to europium ion and the contribution of individual sensitizers along with the luminescence branching ratio of emitting levels of Eu ion were investigated and analysed.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.saa.2025.125987 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Photochemistry upon Charge Separation in Triphenylamine Derivatives from fs to μs.
J Phys Chem B
March 2025
Physikalisch-Chemisches Institut, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
Quantum chemical methods and time-resolved laser spectroscopy are employed to elucidate ultrafast charge-separation processes in triphenylamine (TPA) derivatives upon photoexcitation. When changing the ambient solvent from non-electron-accepting to electron-acceptor solvents, such as chloroform, a vastly extended and multifaceted photochemistry of TPA derivatives is observed. Following initial excitation, two concurrent charge-transfer processes are identified.
View Article and Find Full Text PDFFluorescent Silver Nanoclusters Associated with Double-Stranded Poly(dGdC) DNA.
Nanomaterials (Basel)
March 2025
The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel.
Here, we demonstrate through AFM imaging and CD spectroscopy that the binding of silver ions (Ag) to poly(dGdC), a double-stranded (ds) DNA composed of two identical repeating strands, at a stoichiometry of one Ag per GC base pair induces a one-base shift of one strand relative to the other. This results in a ds nucleic acid-Ag conjugate consisting of alternating CC and GG base pairs coordinated by silver ions. The proposed organization of the conjugate is supported by the results of our Quantum Mechanical (QM) and Molecular Mechanics (MMs) calculations.
View Article and Find Full Text PDFFluor-Predictor: An Interpretable Tool for Multiproperty Prediction and Retrieval of Fluorescent Dyes.
J Chem Inf Model
March 2025
Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, Shanghai 200237, China.
With the rapid advancements in the field of fluorescent dyes, accurate prediction of optical properties and efficient retrieval of dye-related data are essential for effective dye design. However, there is a lack of tools for comprehensive data integration and convenient data retrieval. Moreover, existing prediction models mainly focus on a single property of fluorescent dyes and fail to account for the diverse fluorophores and solutions in a systematic manner.
View Article and Find Full Text PDFDynamic Chirality in Nature-Inspired Photonic Crystal Films: Ultralong Room Temperature Phosphorescence and Stimuli-Responsive Circularly Polarized Luminescence.
ACS Nano
March 2025
School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen (CUHK-Shenzhen), Shenzhen, Guangdong 518172, P.R. China.
Circularly polarized luminescence (CPL) systems exhibiting room-temperature phosphorescence (RTP) are attracting considerable attention for applications in information encryption and smart sensing. However, achieving ultralong circularly polarized RTP (CPRTP) with tunable chirality and stimuli-responsive CPL remains challenging. Inspired by the color-changing properties of the butterfly, we developed a cellulose nanocrystal (CNC)-based photonic crystal film with an ultralong RTP lifetime of 2.
View Article and Find Full Text PDFEfficient and stable near-infrared InAs quantum dot light-emitting diodes.
Nat Commun
March 2025
Zhejiang Key Laboratory of 3D Micro/Nano Fabrication and Characterization, School of Engineering, Westlake University, Hangzhou, China.
Visible quantum dot light-emitting diodes have satisfied commercial display requirements. However, near-infrared counterparts considerably lag behind due to the inferior quality of near-infrared quantum dots and limitations in device architecture suitable for near-infrared electroluminescence. Here, we present an efficient strategy using zinc fluoride to balance ZnSe shell growth across different core quantum dot facets, producing highly regular InAs/InP/ZnSe/ZnS quantum dots with near-unity quantum yield.
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!