The simultaneous emergence of free exciton emission and d0 ferromagnetism for undoped ZnO nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 83909-83915 ◽  
Author(s):  
Srabantika Ghose ◽  
N. Gogurla ◽  
R. Ranganathan ◽  
D. Jana
Keyword(s):  
Zno Nanoparticles ◽  
Mechanical Milling ◽  
Free Exciton ◽  
Exciton Emission ◽  
Excitonic Emission ◽  
D0 Ferromagnetism

Free excitonic emission is observed for the ferromagnetic undoped ZnO nanoparticles prepared by mechanical milling.

Anthracene fluorescence at low temperatures. I. Purified single crystals

1972 ◽  
Vol 25 (7) ◽  
pp. 1411 ◽  
Author(s):  
LE Lyons ◽  
LJ Warren
Keyword(s):  
Low Temperature ◽  
Single Crystals ◽  
Fluorescence Spectrum ◽  
Low Temperatures ◽  
Free Exciton ◽  
Deformation Bands ◽  
Exciton Emission ◽  
Polarized Emission ◽  
Impurity Bands ◽  
Phonon Structure

The low-temperature fluorescence spectrum of purified vapour-grown anthracene single crystals is presented and the free-exciton emission distinguished from a number of defect or impurity bands present even in the purest crystals. In assigning the observed bands the symmetry of the active vibrations and the origin of background fluorescence and deformation bands are discussed. The phonon structure in the region of the fluorescence origin was found to be almost completely b-polarized. Emission of electronic origin (25103 cm-1) was too weak to be observed. Polarization ratios of the principal vibronio bands at 5.6 K are given.

Thermal dependence of free exciton emission in ultraviolet cathodoluminescence of colloidal ZnS

2016 ◽  
Vol 178 ◽  
pp. 134-138 ◽  
Author(s):  
Hong Van Bui ◽  
Van Ben Pham ◽  
Si Dang Le ◽  
Nam Nhat Hoang
Keyword(s):  
Free Exciton ◽  
Thermal Dependence ◽  
Exciton Emission

Probing the excitonic emission of ZnO nanoparticles using UV–VUV excitations

2009 ◽  
Vol 129 (12) ◽  
pp. 1798-1801 ◽  
Author(s):  
D. Tainoff ◽  
B. Masenelli ◽  
P. Melinon ◽  
A. Belsky ◽  
G. Ledoux ◽  
...  
Keyword(s):  
Zno Nanoparticles ◽  
Excitonic Emission

scholarly journals Temperature dependence of the LO phonon sidebands in free exciton emission of GaN

2006 ◽  
Vol 99 (7) ◽  
pp. 073508 ◽  
Author(s):  
S. J. Xu ◽  
G. Q. Li ◽  
S.-J. Xiong ◽  
C. M. Che
Keyword(s):  
Temperature Dependence ◽  
Free Exciton ◽  
Exciton Emission

Polarization-dependent spectroscopy of the near-bandgap excitonic emission in free standing GaN

2003 ◽  
Vol 798 ◽  
Author(s):  
P. P. Paskov ◽  
T. Paskova ◽  
P. O. Holtz ◽  
B. Monemar
Keyword(s):  
Comparative Study ◽  
Valence Band ◽  
Emission Spectra ◽  
Temperature Evolution ◽  
Free Standing ◽  
Selection Rules ◽  
Exciton Emission ◽  
Excitonic Emission

ABSTRACTWe report a comparative study of the exciton emission in free standing HVPE layer for all polarization configurations. A noticeable difference between the emission spectra polarized perpendicular and parallel to the c-axis of the crystal is observed. The spectra for E┴c and EIIc are found to be dominated by the emissions of the donor-bound exciton and exciton-polariton both arising from the A and B valence band, respectively, which clearly reveals the optical selection rules in wurtzite GaN. The temperature evolution of the emission spectra is also examined and the thermal redistribution of the excitons at different polarization is discussed.

Temperature dependence of the free-exciton-emission linewidth in high-purity InP

1995 ◽  
Vol 52 (4) ◽  
pp. R2273-R2276 ◽  
Author(s):  
R. Benzaquen ◽  
R. Leonelli ◽  
S. Charbonneau ◽  
P. J. Poole ◽  
A. P. Roth
Keyword(s):  
Temperature Dependence ◽  
High Purity ◽  
Free Exciton ◽  
Exciton Emission
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