Energy transfer by diffusion and the dipole-dipole interaction: A new perturbation expansion

1984 ◽  
Vol 29 (3) ◽  
pp. 1403-1410 ◽  
Author(s):  
Paolo Sibani ◽  
J. Boiden Pedersen
Keyword(s):  
Energy Transfer ◽  
Perturbation Expansion ◽  
Dipole Interaction ◽  
New Perturbation

Sensitizing effect of Yb3+ on near-infrared fluorescence emission of Cr4+-doped calcium aluminate glasses

2000 ◽  
Vol 15 (2) ◽  
pp. 278-281 ◽  
Author(s):  
Yong Gyu Choi ◽  
Kyong Hon Kim ◽  
Yong Seop Han ◽  
Jong Heo
Keyword(s):  
Energy Transfer ◽  
Calcium Aluminate ◽  
Near Infrared ◽  
Fluorescence Emission ◽  
Dipole Interaction ◽  
Energy Transfer Mechanism ◽  
Efficient Energy Transfer ◽  
Efficient Energy ◽  
Sensitizing Effect ◽  
Decay Behavior

We have demonstrated that an efficient energy transfer takes place from Yb3+ to Cr4+ in calcium aluminate glasses. Yb3+ improves excitation efficiency at around 980 nm, enhancing emission intensity of Cr4+ fluorescence at 1.2–1.6 μm. Nonradiative energy transfer via electric dipole–dipole interaction between ytterbium and chromium ions was found to be dominant over radiative Yb3+ → Cr4+ energy transfer. A diffusionlimited energy transfer mechanism well explains the decay behavior of Yb3+/Cr4+- codoped glasses. This codoping scheme may be applicable to other Cr4+-containing crystals and glasses.

Lumineszenzuntersuchungen zum Problem der Energieübertragung in organischen Molekülkristallen

1970 ◽  
Vol 25 (6) ◽  
pp. 955-966 ◽  
Author(s):  
F. Belitz
Keyword(s):  
Energy Transfer ◽  
Single Crystals ◽  
Fluorescence Spectra ◽  
Dipole Interaction ◽  
Main Process ◽  
Transfer Processes ◽  
Decay Times ◽  
Different Types ◽  
The Mean ◽  
Host Lattices

Abstract From fluorescence spectra and decay times of single crystals of 2.3-dimethylnaphthalene, phenanthrene and p-terphenyl doped with one or two different types of fluorescence molecules (anthracene and, or tetracene) informations about the energy transfer processes are obtained. For doping concentrations smaller than 4·10-4 Mol/Mol the transfer by excitons is the main process. The dipole-dipole interaction over distances more than 80 Å (14 mean molecular distances) can be excluded. The mean travelling distance of the excitons in the three host lattices was found to be 250 - 300 mean molecular distances.

scholarly journals Reversible Energy Transfer and Fluorescence Decay in Solid Solutions

1988 ◽  
Vol 43 (7) ◽  
pp. 627-632 ◽  
Author(s):  
R. Twardowski ◽  
J. Kuśba
Keyword(s):  
Energy Transfer ◽  
Laplace Transform ◽  
Solid Solutions ◽  
Random Distribution ◽  
Excitation Energy Transfer ◽  
Dipole Interaction ◽  
Fluorescence Decay ◽  
Decay Function ◽  
The Laplace Transform ◽  
Hopping Model

Abstract The article deals with the influence of reversible excitation energy transfer on the fluorescence decay in systems with random distribution of molecules. On the basis of a hopping model, we have obtained an expression for the Laplace transform of the decay function and an expression for the average decay time. The case of dipole-dipole interaction is discussed in detail.

scholarly journals Ce3+/Eu2+ Doped Al2O3 Coatings Formed by Plasma Electrolytic Oxidation of Aluminum: Photoluminescence Enhancement by Ce3+→Eu2+ Energy Transfer

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 819 ◽  
Author(s):  
Stevan Stojadinović ◽  
Aleksandar Ćirić
Keyword(s):  
Energy Transfer ◽  
Electric Dipole ◽  
Plasma Electrolytic Oxidation ◽  
Dipole Interaction ◽  
Critical Distance ◽  
Visible Spectral Range ◽  
Electrolytic Oxidation ◽  
Phase And Chemical Composition ◽  
Plasma Electrolytic ◽  
Overlap Method

Plasma electrolytic oxidation (PEO) of aluminum in electrolytes containing CeO2 and Eu2O3 powders in various concentrations was used for creating Al2O3 coatings doped with Ce3+ and Eu2+ ions. Phase and chemical composition, surface morphology, photoluminescence (PL) properties and energy transfer from Ce3+ to Eu2+ were investigated. When excited by middle ultraviolet radiation, Al2O3:Ce3+/Eu2+ coatings exhibited intense and broad emission PL bands in the ultraviolet/visible spectral range, attributed to the characteristic electric dipole 4f05d1→4f1 transition of Ce3+ (centered at about 345 nm) and 4f65d1→4f7 transition of Eu2+ (centered at about 405 and 500 nm). Due to the overlap between the PL emission of Al2O3:Ce3+ and the PL excitation of Al2O3:Eu2+, energy transfer from Ce3+ sensitizer to the Eu2+ activator occurs. The energy transfer is identified as an electric dipole–dipole interaction. The critical distance between Eu2+ and Ce3+ ions in Al2O3 was estimated to be 8.6 Å by the spectral overlap method.

CONTROL OF THE ENERGY TRANSFER WITH THE OPTICAL MICROCAVITY

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3704-3708 ◽  
Author(s):  
M. HOPMEIER ◽  
W. GUSS ◽  
M. DEUSSEN ◽  
E. O. GÖBEL ◽  
R. F. MAHRT
Keyword(s):  
Energy Transfer ◽  
Excitation Energy Transfer ◽  
Interaction Strength ◽  
Dipole Interaction ◽  
Resonant Mode ◽  
Phenylene Vinylene ◽  
Spectral Position ◽  
Optical Microcavity ◽  
Fabry Perot ◽  
Cavity Resonances

We present the first experimental observation that dipole-dipole interaction can be strongly enhanced by placing the system in a microcavity. We have studied the excitation energy transfer in poly(phenyl-p-phenylene vinylene) (PPPV) doped with DCM molecules, placed within a Fabry-Perot resonator. As the spectral position of the cavity resonant mode in tuned across the DCM absorption profile, the transfer efficiency from PPPV to DCM changes dramatically as revealed by photoluminescence (PL) spectra. This behavior is clear evidence for the increase of the dipole-dipole interaction strength at the cavity resonances mediated by propagating modes emitted from the excited dipoles.

The Size Confinement Effect for Eu3+ Concentration Quenching and Energy Transfer in YVO4 Nanocrystal

2016 ◽  
Vol 16 (4) ◽  
pp. 3772-3776 ◽  
Author(s):  
Qingyu Meng ◽  
Jiaqi Dai ◽  
Wenjun Sun ◽  
Changwen Wang
Keyword(s):  
Energy Transfer ◽  
Exchange Interaction ◽  
Electric Dipole ◽  
Dipole Interaction ◽  
Concentration Quenching ◽  
Confinement Effect ◽  
Precipitation Method ◽  
Range Interaction ◽  
Operating Range ◽  
Size Confinement

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.

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