Heteroepitaxial growth of wide bandgap cuprous iodide films exhibiting clear free-exciton emission

2021 ◽  
Vol 118 (1) ◽  
pp. 012103
Author(s):  
S. Inagaki ◽  
M. Nakamura ◽  
Y. Okamura ◽  
M. Ogino ◽  
Y. Takahashi ◽  
...  
Keyword(s):  
Free Exciton ◽  
Wide Bandgap ◽  
Heteroepitaxial Growth ◽  
Exciton Emission

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.

Optical Interactions and Photoluminescence Properties of Wide-Bandgap Nanocrystallites

2003 ◽  
Vol 789 ◽  
Author(s):  
Leah Bergman ◽  
Xiang-Bai Chen ◽  
Jesse Huso ◽  
Althea Walker ◽  
John L. Morrison ◽  
...  
Keyword(s):  
Free Exciton ◽  
Vacuum State ◽  
Mean Free Path ◽  
Wide Bandgap ◽  
Photoluminescence Properties ◽  
Interparticle Separation ◽  
Intensity Saturation ◽  
The Mean ◽  
The Impact ◽  
Excitonic Recombination

ABSTRACTThe UV-photoluminescence (PL) properties of GaN and ZnO nanocrystallites and nanocrystallite ensembles were studied utilizing micro-photoluminescence. We address the origin of the light emissions of the nanocrystallite as to whether it is due a bandgap or excitonic recombination process. The other topic presented here focuses on the interaction of the laser with a collective of crystallites; we address the phenomena of intensity saturation at a high density of laser excitations as well as the impact of the vacuum state on the PL characteristics. Our analysis indicates that the PL of both GaN and ZnO nanocrysallites is excitonic-like and very similar to the behavior of the free exciton in bulk materials. Additionally, we attribute the intensity saturation of GaN and ZnO to the laser heating and heat trapping which takes place in the enclosure of the nanocrystallite ensemble. In vacuum the PL energy was found to exhibit a strong PL energy redshift relative to the PL in air. We attribute the observed shift to a thermal effect and analyze it in terms of the conditions enabling a convective cooling in the ensemble: the mean free path of air in atmospheric pressure and in vacuum relative to the interparticle separation inside the ensemble.

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.

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

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

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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