Laser-induced formation of nonradiative centers observed by two-wavelength excited photoluminescence

2008 ◽  
Vol 5 (9) ◽  
pp. 2929-2931 ◽  
Author(s):  
H. Ogawa ◽  
N. Uchiyama ◽  
N. Kamata ◽  
Y. Arakawa
Keyword(s):  
Nonradiative Centers

scholarly journals Trap and nonradiative centers in Ba_3Si_6O_12N_2:Eu^2+ phosphors observed by thermoluminescence and two-wavelength excited photoluminescence methods

2015 ◽  
Vol 23 (13) ◽  
pp. 16511 ◽  
Author(s):  
Tingting Li ◽  
Norihiko Kamata ◽  
Yosuke Kotsuka ◽  
Takeshi Fukuda ◽  
Zentaro Honda ◽  
...  
Keyword(s):  
Nonradiative Centers

Roles of Surface Termination in Photoluminescence Mechanisms of Porous Si

1996 ◽  
Vol 452 ◽  
Author(s):  
Y. Suda ◽  
K. Obata ◽  
A. Kumagai ◽  
N. Koshida
Keyword(s):  
Oxidation Process ◽  
Skeletal Structure ◽  
Photoemission Spectroscopy ◽  
Energy Band Gap ◽  
Surface Termination ◽  
Peak Intensity ◽  
Peak Energy ◽  
The Relationship ◽  
Synchrotron Radiation Photoemission ◽  
Nonradiative Centers

AbstractThe relationship between the oxidation states and PL properties and the effects of H/O termination exchange on the PL properties of PS have been investigated using synchrotron radiation photoemission spectroscopy (SR-PES), Auger electron spectroscopy (AES), Fourier transform infrared (FTIR), and photoluminescence (PL) techniques. The energy band gap, the peak energy and FWHM of the PL spectrum are almost unchanged by the oxidation process and by the H/O termination exchange. After the oxidation, the PL peak intensity decreased, suggesting the creation of nonradiative centers. In the H/O termination exchange experiment, the PL peak intensity decreased by more than 65% upon annealing. However, it recovered the initial PL intensity by oxygen exposure. These results suggest that the surface termination itself functions to eliminate the nonradiative centers without depending on the termination species of hydrogen or oxygen, and that the skeletal structure of PS crystallites is important in the PL mechanisms.

Dominant nonradiative centers in InGaN single quantum well by time-resolved and two-wavelength excited photoluminescence

2014 ◽  
Vol 252 (5) ◽  
pp. 952-955 ◽  
Author(s):  
M. Julkarnain ◽  
N. Murakoshi ◽  
A. Z. M. Touhidul Islam ◽  
T. Fukuda ◽  
N. Kamata ◽  
...  
Keyword(s):  
Quantum Well ◽  
Single Quantum ◽  
Single Quantum Well ◽  
Time Resolved ◽  
Nonradiative Centers

Effects of nonradiative centers on localized excitons in InGaN quantum well structures

2006 ◽  
Vol 89 (22) ◽  
pp. 222110 ◽  
Author(s):  
H. Gotoh ◽  
T. Akasaka ◽  
T. Tawara ◽  
Y. Kobayashi ◽  
T. Makimoto ◽  
...  
Keyword(s):  
Quantum Well ◽  
Quantum Well Structures ◽  
Localized Excitons ◽  
Nonradiative Centers

The Origin of Nonradiative Centers in Degraded LEDs from GaAs0.6P0.4

1986 ◽  
Vol 98 (2) ◽  
pp. 629-632
Author(s):  
A. Popov ◽  
R. Atanasova
Keyword(s):  
Nonradiative Centers

A critical factor affecting on the performance of blue-violet InGaN multiquantum well laser diodes: Nonradiative centers

2010 ◽  
Vol 97 (7) ◽  
pp. 071910 ◽  
Author(s):  
D. M. Shin ◽  
J. Park ◽  
D. H. Nguyen ◽  
Y. D. Jang ◽  
K. J. Yee ◽  
...  
Keyword(s):  
Laser Diodes ◽  
Critical Factor ◽  
Nonradiative Centers ◽  
Multiquantum Well

Nonradiative centers in InAs quantum dots revealed by two-wavelength excited photoluminescence

2006 ◽  
Vol 376-377 ◽  
pp. 849-852 ◽  
Author(s):  
N. Kamata ◽  
S. Saravanan ◽  
J.M. Zanardi Ocampo ◽  
P.O. Vaccaro ◽  
Y. Arakawa
Keyword(s):  
Quantum Dots ◽  
Inas Quantum Dots ◽  
Nonradiative Centers

SCINTILLATION DECAY IN CALCIUM TUNGSTATE

1965 ◽  
Vol 43 (11) ◽  
pp. 1925-1933 ◽  
Author(s):  
M. Sayer ◽  
W. R. Hardy
Keyword(s):  
Temperature Dependence ◽  
Single Crystals ◽  
Decay Time ◽  
Luminescence Decay ◽  
Luminescence Decay Time ◽  
Γ Radiation ◽  
Calcium Tungstate ◽  
Γ Ray ◽  
Nonradiative Centers

Measurements of the luminescence decay time have been made for a number of single crystals of calcium tungstate for excitation by cathode rays, α and γ radiation. The value of the decay time was found to depend both on the crystal used and on the nature of the excitation. For γ-ray excitation, the decay time was in the range 6.1 to 6.8 μ sec. The values obtained for cathode-ray excitation were, in general, 20–30% higher for all crystals, while for α excitation, several crystals showed no change in decay time, while others showed a decay time 20% faster. Measurements of the temperature dependence of the decay time and thermoluminescence experiments indicate that these differences in behavior can be attributed to differences in the density of energy traps and nonradiative centers in the crystal and to a rise in temperature in the excited channel.

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