YVO4: Eu3+ nanocrystal powders (~30 nm) with different doping concentrations were prepared using a precipitation method. Bulky powders (~500 nm) were obtained by annealing the nanopowders at high temperature. The concentration quenching of luminescent centers and energy transfer in YVO4: Eu3+ powders were investigated. It was found that quenching concentration for Eu3+ 5D0--> 7F2 transition emission in nanopowders is distinctly higher than that in bulk powders. The type of energy transfer that caused concentration quenching was identified to be electric dipole-dipole interaction in bulk powders and exchange interaction in nanopowders. The electric dipole-dipole interaction is a long-range interaction (operating range of several nanometers). The size confinement effect of boundary in nanoparticles has obvious inhibitory effect on electric dipole-dipole interaction, and hardly affect the exchange interaction which is a short-range interaction (operating range several angstroms). The electric dipole-dipole interaction is restrained by particle boundary in nanopowders. So energy transfer of Eu3+ ions in nanomaterials is dominated by exchange interaction, and quenching concentration of nanomaterials is higher than in bulky materials.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1166/jnn.2016.11841 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Mechanistic insights into carbonate radical-driven reactions: Selectivity and the hydrogen atom abstraction route.
J Hazard Mater
December 2024
Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing 400045, PR China.
Carbonate radical (CO) is inevitably produced in advanced oxidation processes (AOPs) when addressing real-world aqueous environments, yet it often goes unnoticed due to its relatively lower reactivity. In this study, we emphasized the pivotal role of CO in targeting the elimination of contaminants by contrasting it with conventional reactive oxygen species (ROSs) and assessing the removal of sulfamethazine (SMT). Similar to singlet oxygen (O), CO shows a preference for electron-rich organic compounds.
View Article and Find Full Text PDFWe report Er emission in YAlO host, sensitized by Cr. The excitation bands of Cr at 416 and 555 nm are broad and effectively cover the region 400-600 nm. The phosphor can be useful for converting 400-600 nm radiations to infrared (IR) light around 1521 nm.
View Article and Find Full Text PDFDilated cardiomyopathy variant R14del increases phospholamban pentamer stability, blunting dynamic regulation of calcium.
J Biol Chem
December 2024
Department of Cell and Molecular Physiology, Loyola University Chicago, Maywood, IL, USA. Electronic address:
The sarco(endo)plasmic reticulum Ca ATPase (SERCA) is a membrane transporter that creates and maintains intracellular Ca stores. In the heart, SERCA is regulated by an inhibitory interaction with the monomeric form of the transmembrane micropeptide phospholamban (PLB). PLB also forms avid homo-pentamers, and dynamic exchange of PLB between pentamers and SERCA is an important determinant of cardiac responsiveness to exercise.
View Article and Find Full Text PDFMitochondrial Transfer: Therapeutic Implications for Energy Metabolism in Heart Failure.
Pharmacol Res
December 2024
The First Affiliated Hospital, Guangzhou University of Chinese Medicine, Guangzhou 510405, PR China; Lingnan Medical Research Center, Guangzhou University of Chinese Medicine, Guangzhou 510405, PR China; Guangzhou Key Laboratory of Chinese Medicine for Prevention and Treatment of Chronic Heart Failure, Guangzhou 510405, PR China.
Heart failure (HF) remains one of the leading causes of high morbidity and mortality globally. Impaired cardiac energy metabolism plays a critical role in the pathological progression of HF. Various forms of HF exhibit marked differences in energy metabolism, particularly in mitochondrial function and substrate utilization.
View Article and Find Full Text PDFToxicity of microplastics and nano-plastics to coral-symbiotic alga (Dinophyceae Symbiodinium): Evidence from alga physiology, ultrastructure, OJIP kinetics and multi-omics.
Water Res
December 2024
School of Chemistry and Environment, Guangdong Ocean University, Zhanjiang, 524088, China; Analyzing and Testing Center, Guangdong Ocean University, Zhanjiang, 524088, China; Analytical and Testing Center for Ocean in Western of Guangdong Province, Guangdong Provincial Observation and Research Station for Tropical Ocean Environment in Western Coastal Water, Guangdong Ocean University, Zhanjiang, 524088, China. Electronic address:
Corals are representative of typical symbiotic organisms. The coral-algal (Symbiodinium spp.) symbiosis drives the productivity of entire coral reefs.
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!