Low temperature photoluminescence and deformation luminescence of microparticles SrAl2O4:(Eu2+, Dy3+) in a matrix of photopolymer

2014 ◽  
Vol 28 (23) ◽  
pp. 1450154 ◽  
Author(s):  
A. A. Banishev ◽  
A. A. Lotin ◽  
A. F. Banishev
Keyword(s):  
Low Temperature ◽  
Energy Levels ◽  
Visible Region ◽  
Short Wave ◽  
Disperse Powder ◽  
Wave Band ◽  
New Information ◽  
Fine Disperse ◽  
Low Temperature Photoluminescence ◽  
Impurities And Defects

The paper deals with low-temperature photoluminescence and deformation luminescence (mechanoluminescence) of a composite material based on fine disperse powder of phosphor SrAl 2 O 4:( Eu 2+, Dy 3+) and photopolymerizing resin that is transparent in the visible region. New information about the energy levels of impurities and defects was obtained. It has been found that at low temperatures (T = 15 ÷ 200 K) the photoluminescence spectrum of SrAl 2 O 4:( Eu 2+, Dy 3+) presents two partially overlapping wide bands with the maxima at λ1 max = 446 nm and λ2 max = 517 nm. The strong interaction of energy states of the bands results in temperature quenching of the short-wave band of luminescence (λ1 max = 446 nm) and its complete attenuation at T ≥ 200 K. The results were used to describe the mechanism of persistent luminescence and mechanoluminescence of SrAl 2 O 4:( Eu 2+, Dy 3+).

Excited States of Bound Excitons and Neutral Donors in CdS

1971 ◽  
Vol 49 (19) ◽  
pp. 2432-2439 ◽  
Author(s):  
H. Malm ◽  
R. R. Haering
Keyword(s):  
Binding Energy ◽  
Excited States ◽  
Complex I ◽  
Radiative Decay ◽  
Energy Levels ◽  
Auger Process ◽  
Neutral Donor ◽  
New Information ◽  
Donor Binding Energy ◽  
Low Temperature Photoluminescence

A technique employing a monochromator to select the incident photon energy and a spectrometer to analyze the low temperature photoluminescence of CdS crystals has proven to be valuable, both in analyzing the usual photoluminescent spectra and in obtaining new information on excited states of bound excitons and excited states of neutral donors in the crystal. An accurate measurement of the donor energy levels and the donor binding energy gave a binding energy for the Cl donor in CdS of 33.0 ± 0.2 meV. Energies of excited states of the bound exciton complexes were also measured and for the bound exciton – neutral donor complex (I2 complex) some seven excited state levels were found. One type of radiative decay observed for this I2 complex is a radiative Auger process. This has important consequences in interpreting photoconductivity spectra.

LOW TEMPERATURE PHOTOLUMINESCENCE AND ABSORPTION OF GaxIn1-xAs/ InP

1982 ◽  
Vol 43 (C5) ◽  
pp. C5-383-C5-392 ◽  
Author(s):  
K. H. Goetz ◽  
A. V. Solomonov ◽  
D. Bimberg ◽  
H. Jürgensen ◽  
M. Razeghi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Photoluminescence

scholarly journals The ultra-violet spectrum of magnesium hydride. 1.—The band at λ 2430

1929 ◽  
Vol 122 (790) ◽  
pp. 442-455 ◽  
Keyword(s):  
Fine Structure ◽  
General Structure ◽  
Energy Levels ◽  
Visible Region ◽  
Ultra Violet ◽  
Present Theory ◽  
Magnesium Hydride ◽  
Electronic Energy ◽  
Band Spectra ◽  
Electronic Energy Levels

The system of bands in the visible region of the emission spectrum of magnesium hydride is now well known. The bands with heads at λλ 5622, 5211, 4845 were first measured by Prof. A. Fowler, who arranged many of the strongest lines in empirical series for identification with absorption lines in the spectra of sun-spots. Later, Heurlinger rearranged these series in the now familiar form of P, Q and R branches, and considered them, with the OH group, as typical of doublet systems in his classification of the fine structure of bands. More recently, W. W. Watson and P. Rudnick have remeasured these bands, using the second order of a 21-foot concave grating, and have carried out a further investigation of the fine structure in the light of the present theory of band spectra. Their detection of an isotope effect of the right order of magnitude, considered with the general structure of the system, and the experimental work on the production of the spectrum, seems conclusive in assigning these bands to the diatomic molecule MgH. The ultra-violet spectrum of magnesium hydride is not so well known. The band at λ 2430 and the series of double lines in the region λ 2940 to λ 3100, which were recorded by Prof. Fowler in 1909 as accompanying the group of bands in the visible region, appear to have undergone no further investigation. In view of the important part played by hydride band spectra in the correlation of molecular and atomic electronic energy levels, it was thought that a study of these features might prove of interest in yielding further information on the energy states of the MgH molecule. The present paper deals with observations on the band at λ 2430; details of an investigation of the other features of the ultra-violet spectrum will be given in a later communication.

Low temperature photoluminescence from disordered granular ZnO

2016 ◽  
Vol 169 ◽  
pp. 326-333 ◽  
Author(s):  
S. Pal ◽  
A. Sarkar ◽  
P. Kumar ◽  
D. Kanjilal ◽  
T. Rakshit ◽  
...  
Keyword(s):  
Low Temperature ◽  
Low Temperature Photoluminescence
Sign in / Sign up

Export Citation Format

Share Document