Highly water-soluble cationic palladium porphyrin as a sensitizer and 9,10-bis(4-trimethylammoniumphenyl)anthracene as an emitter were newly synthesized. They were shown to be bound and immobilized in DNA double helix assembly from absorption, fluorescence, phosphorescence, and circular dichroism spectra. Upon excitation at 532 nm in deaerated aqueous solutions, they showed weak blue upconversion fluorescence, the efficiency of which increased dramatically in the presence of DNA. The threshold power density between the second-order and first-order power dependence of upconversion fluorescence decreased to less than a half upon addition of DNA. The emitter triplet lifetime estimated from time dependences of upconversion fluorescence at low power ns pulsed laser was found to considerably increase in the presence of DNA. From these results, DNA was concluded to work effectively in concentrating both sensitizer and emitter and in migrating excited triplet states, resulting in efficient upconversion.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/acsbiomaterials.7b00238 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Investigation of Er-Doped BaF Single Crystals for Infrared Emission and Photovoltaic Efficiency Enhancement.
Luminescence
January 2025
Department of Physics, IMN, Universidad de La Laguna, San Cristobal de La Laguna, Santa Cruz de Tenerife, Spain.
Er-doped BaF single crystals were investigated with two primary aims: first, to probe the infrared emissions from the I level (around 1.0 μm) under 1500-nm excitation and, second, to use the crystal to enhance the efficiency of silicon-based solar cells through upconversion mechanism. Upon excitation at 1500 nm, the upconversion emission spectrum of the Er-doped BaF single crystals, recorded in the range of 480-1080 nm, exhibited two well-structured visible bands at 538 and 650 nm, along with a strong near infrared emission at 971 nm.
View Article and Find Full Text PDFHarnessing LRET in a rationally designed "sandwich" fluorescent probe for selective ClO sensing.
Spectrochim Acta A Mol Biomol Spectrosc
January 2025
Zhejiang Cancer Hospital, Hangzhou Institute of Medicine, Chinese Academy of Sciences, Hangzhou 310022, PR China; School of Molecular Medicine, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, PR China.
Article Synopsis
- Upconversion nanoparticles (UCNPs) are advanced light-emitting materials that use near-infrared light for sensing, helping to avoid issues caused by natural fluorescence in biological samples.
- Traditional UCNP designs have limitations in accurately locating luminescent doped ions within their structure, leading to background noise and inefficient light emission.
- The new core-middle-shell UCNPs-IR820 design improves luminescence detection by incorporating a "sandwich" structure that enhances energy transfer, allowing for effective signaling changes in response to specific analytes like ClO.
Biomarker Detection and Therapy of Parkinson's and Alzheimer's disease using upconversion based approach: A Comprehensive Review.
Ageing Res Rev
January 2025
Department of Pharmaceutics, NIMS Institute of Pharmacy, NIMS University, Jaipur 303121, Rajasthan, India.
Neurodegenerative diseases (NDs) are debilitating disorders characterized by the progressive and selective loss of function or structure in the brain and spinal cord. Both chronic and acute forms of these diseases are associated with significant morbidity and mortality, as they involve the degeneration of neurons in various brain regions. Misfolding and aggregation of amyloid proteins into oligomer and β-sheet rich fibrils share as common hallmark and lead to neurotoxicity.
View Article and Find Full Text PDFUnlocking advanced thermometric capabilities: BiVO: Er/Yb nanophosphors with dual-mode up-conversion and down-shifting features.
RSC Adv
January 2025
Department of Condensed Matter Physics, GdS Optronlab, LUCIA Building, University of Valladolid Paseo de Belén 19 47011 Valladolid Spain.
Luminescent materials doped with rare-earth (RE) ions have emerged as powerful tools in thermometry, offering high sensitivity and accuracy. However, challenges remain, particularly in maintaining efficient luminescence at elevated temperatures. This study investigates the thermometric properties of BiVO: Yb/Er (BVO: Er/Yb) nanophosphors synthesized the sol-gel method.
View Article and Find Full Text PDFA Complete Description of the Ultrafast Proton Transfer Dynamics in the Excited State of D-Luciferin.
J Phys Chem B
January 2025
UM-DAE Centre for Excellence in Basic Sciences, Kalina Campus of Mumbai University, Santacruz (E), Mumbai 400098, India.
Excited-state proton transfer (ESPT) in organic photoacids is a widely studied phenomenon in which D-luciferin is of special mention, considering the fact that apart from its phenolic OH group, the nitrogen atoms at either of the two thiazole moieties could also participate in hydrogen bonding interactions with a proton-donating solvent during ESPT. As a result, several transient species could appear during the ESPT process. We hereby deploy subpicosecond time-resolved fluorescence upconversion (FLUP) and transient absorption (TA) spectroscopic techniques to understand the detailed photophysics of D-luciferin in water as well as in dimethyl sulfoxide (DMSO) and ethanol.
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!