Site selective fluorescence and purity of a rare earth garnet crystal

1981 ◽  
Vol 59 (16) ◽  
pp. 2441-2448 ◽  
Author(s):  
L. V. Haley ◽  
B. Jacquier ◽  
J. A. Koningstein
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Fluorescence Spectroscopy ◽  
Fluorescence Spectrum ◽  
Experimental Results ◽  
Garnet Crystal ◽  
Excitation Spectra ◽  
Site Selective

Site selective fluorescence spectroscopy of a crystal of europium gallium garnet containing Cr3+ as an impurity has been carried out. An analysis of the experimental results reveals that the strongest fluorescence spectrum between 590.0 nm and 620.0 nm is due to emission from an Eu3+−Cr3+ pair. Fluorescences of farther removed pairs and that of Eu3+ occupying the 8-coordinated d site and 6-coordinated Ga3+ site are also assigned. Energy transfer between the various sites occurs while the excitation spectra for the R lines of Cr3+ show that extremely fast transfer takes place between the R2 and R1 levels.

Eu and Yb Excitation Mechanisms in ZnS, CaS, SrS and InP

1993 ◽  
Vol 301 ◽  
Author(s):  
M. Godlewski ◽  
K. Światek ◽  
B. Monemar
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Excited State ◽  
Exciton State ◽  
Experimental Results ◽  
Excitation Mechanism ◽  
Core State ◽  
Excitonic State ◽  
Excitation Mechanisms

ABSTRACTThe role of the excitonic excitation mechanism of the rare earth (RE) intra-shell emission is discussed. Two cases are analyzed. For Yb ion in InP 4f-4f emission of Yb3+ is induced by energy transfer from bound exciton state to the RE core state. For Eu in CaS and SrS RE emission is induced by carrier trapping directly to the excited state of Eu2+ ion. Also in this case the intermediate excitonic state may participate in RE excitation, as suggested by some experimental results.

Excitation of the 4F-4F Emission of Donor-Type Rare-Earth Centers Through Donor-Acceptor Pair States (ZNS:TM)

1993 ◽  
Vol 301 ◽  
Author(s):  
K. LÖbe ◽  
R. Boyn ◽  
H. Zimmermann
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Acceptor Pair ◽  
Pumping Rate ◽  
Electron Beam Excitation ◽  
Donor Type ◽  
Donor Acceptor ◽  
Donor Acceptor Pair ◽  
Partial Blocking ◽  
Site Selective

ABSTRACTEnergy transfer from donor-acceptor pair states is known to be an efficient excitation channel for 4f-4f emission, especially if the rare-earth centers themselves are the relevant donors. Information on this type of mechanism can be obtained in the case when it is possible to observe, parallel to the 4f-4f emission, luminescence arising from radiative deexcitation of the pairs.We have found these two kinds of emission, under electron-beam excitation, in ZnS:Tm crystals which, according to earlier site-selective studies performed by us, contain predominantly donor-type rare-earth centers. Characteristic differences between the two kinds of emission are found in the dependence of intensities on pumping rate; these arise from partial blocking of the energy transfer due to depopulation of the 4f ground levels. By quantitative studies of the correlation between those intensities we demonstrate that the same types of initial states are involved in the energy transfer and the pair transitions.

THE QUENCHING OF THE IODINE FLUORESCENCE SPECTRUM

1958 ◽  
Vol 36 (1) ◽  
pp. 114-120 ◽  
Author(s):  
C. Arnot ◽  
C. A. McDowell
Keyword(s):  
Energy Transfer ◽  
Fluorescence Spectrum ◽  
Kinetic Scheme ◽  
Experimental Results ◽  
Inert Gases ◽  
Vibration Energy ◽  
Preliminary Results ◽  
Transfer Processes

The quenching of the iodine fluorescence spectrum by various inert gases and oxygen has been studied with a view to obtaining information on the efficiencies of vibration energy transfer processes in this system. Preliminary results here presented are in agreement with earlier work of Rössler and Eliaschevich and indicate that the transfer processes are very efficient. A kinetic scheme is proposed to account for the various possible quenching and transfer processes and it is shown that this is in agreement with experimental results.

Suppressed energy transfer between different rare earth ions to obtain enhanced and tuned fluorescence by using Janus nanofibers

2021 ◽  
Author(s):  
Ping Wu ◽  
Qianli Ma ◽  
Wensheng Yu ◽  
Jinxian Wang ◽  
Gui-Xia Liu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Rare Earth Ions ◽  
Native Fluorescence ◽  
Fluorescent Materials ◽  
Negative Effect

Here, we put forward a viewpoint that the energy transfer between different rare earth (RE) ions plays negative effect in RE ions doped white fluorescent materials if the native fluorescence...

Rare Earth Complex as Electron Trapper and Energy Transfer Ladder for Efficient Red Iridium Complex Based Electroluminescent Devices

2015 ◽  
Vol 7 (29) ◽  
pp. 16046-16053 ◽  
Author(s):  
Liang Zhou ◽  
Leijiao Li ◽  
Yunlong Jiang ◽  
Rongzhen Cui ◽  
Yanan Li ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Rare Earth Complex ◽  
Iridium Complex ◽  
Electroluminescent Devices
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