Radiative Lifetime, Non‐Radiative Relaxation, and Sensitization Efficiency in Luminescent Europium and Neodymium Cryptates – The Roles of 2,2′‐Bipyridine‐ N,N′ ‐dioxide and Deuteration

ChemPhysChem ◽  
2019 ◽  
Vol 20 (17) ◽  
pp. 2179-2186
Author(s):  
Markus F. K. Trautnitz ◽  
Christine Doffek ◽  
Michael Seitz
Keyword(s):  
Radiative Lifetime ◽  
Radiative Relaxation ◽  
Sensitization Efficiency

scholarly journals Synthesis and cell localization of self-assembled dinuclear lanthanide bioprobes

2013 ◽  
Vol 371 (1995) ◽  
pp. 20120295 ◽  
Author(s):  
Anne-Sophie Chauvin ◽  
Frédéric Thomas ◽  
Bo Song ◽  
Caroline D. B. Vandevyver ◽  
Jean-Claude G. Bünzli
Keyword(s):  
Dipicolinic Acid ◽  
Photophysical Properties ◽  
Radiative Lifetime ◽  
Time Resolved ◽  
Luminescence Microscopy ◽  
Cell Localization ◽  
Enhanced Sensitivity ◽  
Synthetic Strategy ◽  
Self Assembled ◽  
Sensitization Efficiency

Lanthanide bioprobes and bioconjugates are ideal luminescent stains in view of their low propensity to photobleaching, sharp emission lines and long excited state lifetimes permitting time-resolved detection for enhanced sensitivity. In this paper, we expand our previous work which demonstrated that self-assembled dinuclear triple-stranded helicates [Ln 2 (L C2X ) 3 ] behave as excellent cell and tissue labels in immunocytochemical and immunohistochemical assays. The synthetic strategy of the hexadentate ditopic ligands incorporating dipicolinic acid, benzimidazole units and polyoxyethylene pendants is revisited in order to provide a more straightforward route and to give access to further functionalization of the polyoxyethylene arms by incorporating a terminal function X. Formation of the helicates [Ln 2 (L C2X ) 3 ] ( X =COOH, CH 2 OH, COEt, NH 2 , phthalimide) is ascertained by several experimental techniques and their stability tested against diethylenetriaminepentaacetate. Their photophysical properties (quantum yield, lifetime, radiative lifetime and sensitization efficiency) are presented and compared with those of the parent helicates [Ln 2 (L C2 ) 3 ]. Finally, the cellular uptake of five Eu III helicates is monitored by time-resolved luminescence microscopy and their localization in HeLa cells established by co-staining experiments.

A Photoluminescent Au(I)/Ag(I)/PNN coordination complex for Relatively Rapid and Reversible Alcohol Sensing

2021 ◽  
Author(s):  
Yanhui Tao ◽  
Yuwei Wang ◽  
Shengnan Hu ◽  
David James Young ◽  
Chengrong Lu ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Coordination Complex ◽  
Trinuclear Complex ◽  
Low Molecular Weight ◽  
Radiative Relaxation ◽  
Π Interactions

Trinuclear complex [Au2Ag(dppmaphen)2(CN)2]PF6 photoluminesces on exposure to low molecular weight alcohols. This emission is likely due to C-H···π interactions between the analyte and –PPh2 group, that inhibits non-radiative relaxation of...

Rovibrationally resolved radiative lifetime and collisional cross section measurements of the 61Σg+(v=6,8,J=31) state of molecular sodium

2020 ◽  
pp. 107438
Author(s):  
Dinesh Wagle ◽  
Lok R. Pant ◽  
Joseph Converse ◽  
Scott Wenner ◽  
Ziya Saglam ◽  
...  
Keyword(s):  
Cross Section ◽  
Radiative Lifetime ◽  
Collisional Cross Section

Modified radiative lifetime of Eu3+ ions in Y2O3 thin films on Al2O3 substrates

2021 ◽  
Vol 230 ◽  
pp. 117754
Author(s):  
S.P. Feofilov ◽  
A.M. Korovin ◽  
A.B. Kulinkin ◽  
D.S. Kuzin ◽  
A.N. Smirnov ◽  
...  
Keyword(s):  
Thin Films ◽  
Radiative Lifetime

Synthesis and size control of Si nanocrystals by SiO/SiO2 superlattices and Er doping

2002 ◽  
Vol 737 ◽  
Author(s):  
J. Heitmann ◽  
D. Kovalev ◽  
M. Schmidt ◽  
L.X. Yi ◽  
R. Scholz ◽  
...  
Keyword(s):  
Phase Separation ◽  
Crystal Size ◽  
Radiative Lifetime ◽  
Size Control ◽  
Luminescence Signal ◽  
Er Doping ◽  
Size Dependent ◽  
Transmission Electron ◽  
Si Nanocrystals ◽  
Ultrathin Layers

ABSTRACTThe synthesis of nc-Si by reactive evaporation of SiO and subsequent thermal induced phase separation is reported. The size control of nc-Si is realized by evaporation of SiO/SiO2 superlattices. By this method an independent control of crystal size and density is possible. The phase separation of SiO into SiO2 and nc-Si in the limit of ultrathin layers is investigated. Different steps of this phase separation are characterized by photoluminescence, infrared absorption and transmission electron microscopy measurements. The strong room temperature luminescence of nc-Si shows a strong blueshift of the photoluminescence signal from 850 to 750 nm with decreasing crystal size. Several size dependent properties of this luminescence signal, like decreasing radiative lifetime and increasing no-phonon transition properties with decreasing crystal size are in good agreement with the quantum confinement model. Er doping of the nc-Si shows an enhancement of the Er luminescence at 1.54 μm by a factor of 5000 compared to doped SiO2 layers. The decreasing transfer time for the nc-Si to Er transition with decreasing crystal size can be understood as additional proof of increasing recombination probability within the nc-Si for decreasing crystal size.

scholarly journals Radiative properties of quantum emitters in boron nitride from excited state calculations and Bayesian analysis

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Shiyuan Gao ◽  
Hsiao-Yi Chen ◽  
Marco Bernardi
Keyword(s):  
Boron Nitride ◽  
Density Functional ◽  
Single Photon ◽  
Radiative Lifetime ◽  
Radiative Properties ◽  
Data Set ◽  
Radiative Lifetimes ◽  
Emission Energy ◽  
Single Photon Emitters ◽  
Quantum Emitters

AbstractPoint defects in hexagonal boron nitride (hBN) have attracted growing attention as bright single-photon emitters. However, understanding of their atomic structure and radiative properties remains incomplete. Here we study the excited states and radiative lifetimes of over 20 native defects and carbon or oxygen impurities in hBN using ab initio density functional theory and GW plus Bethe-Salpeter equation calculations, generating a large data set of their emission energy, polarization and lifetime. We find a wide variability across quantum emitters, with exciton energies ranging from 0.3 to 4 eV and radiative lifetimes from ns to ms for different defect structures. Through a Bayesian statistical analysis, we identify various high-likelihood charge-neutral defect emitters, among which the native VNNB defect is predicted to possess emission energy and radiative lifetime in agreement with experiments. Our work advances the microscopic understanding of hBN single-photon emitters and introduces a computational framework to characterize and identify quantum emitters in 2D materials.

Single-molecule spectromicroscopy: a route towards sub-wavelength refractometry

2015 ◽  
Vol 184 ◽  
pp. 263-274 ◽  
Author(s):  
T. A. Anikushina ◽  
M. G. Gladush ◽  
A. A. Gorshelev ◽  
A. V. Naumov
Keyword(s):  
Refractive Index ◽  
Single Molecule ◽  
Low Temperatures ◽  
Radiative Lifetime ◽  
Spatially Resolved ◽  
Local Fluctuations ◽  
Novel Approach ◽  
Spectral Linewidth ◽  
Spatial Fluctuations ◽  
Sub Wavelength

We suggest a novel approach for spatially resolved probing of local fluctuations of the refractive index n in solids by means of single-molecule (SM) spectroscopy. It is based on the dependence T1(n) of the effective radiative lifetime T1 of dye centres in solids on n due to the local-field effects. Detection of SM zero-phonon lines at low temperatures gives the values of the SM natural spectral linewidth (which is inversely proportional to T1) and makes it possible to reveal the distribution of the local n values in solids. Here we demonstrate this possibility on the example of amorphous polyethylene and polycrystalline naphthalene doped with terrylene. In particular, we show that the obtained distributions of lifetime limited spectral linewidths of terrylene molecules embedded into these matrices are due to the spatial fluctuations of the refractive index local values.

Collisional and Radiative Relaxation of Selected States in Neon I and Argon II

1971 ◽  
Vol 4 (3) ◽  
pp. 815-821 ◽  
Author(s):  
R. Arrathoon ◽  
D. A. Sealer
Keyword(s):  
Radiative Relaxation

Radiative relaxation of low-energy electron excitations and point defects in beryllium oxide

1996 ◽  
Vol 39 (11) ◽  
pp. 1067-1081 ◽  
Author(s):  
A. V. Kruzhalov ◽  
I. N. Ogorodnikov ◽  
S. V. Kudyakov
Keyword(s):  
Point Defects ◽  
Beryllium Oxide ◽  
Low Energy ◽  
Energy Electron ◽  
Radiative Relaxation ◽  
Low Energy Electron ◽  
Electron Excitations

Unusually Large Change in Radiative Lifetime of theA-Band Emission in KI:In+and KI:Sn2+Induced by a Magnetic Field

1972 ◽  
Vol 28 (16) ◽  
pp. 1032-1034 ◽  
Author(s):  
Atsuo Fukuda ◽  
Philip Yuster
Keyword(s):  
Magnetic Field ◽  
Radiative Lifetime ◽  
Large Change ◽  
Band Emission
Sign in / Sign up

Export Citation Format

Share Document