Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Sekika Yamamoto"'
Autor:
Sekika Yamamoto
Publikováno v:
The Journal of Physical Chemistry C. 115:21635-21640
The photoenhancement effect of the band-edge photoluminescence in ZnO nanocrystals dispersed in ethanol is investigated by observing changes in optical properties after ultraviolet illumination. Time-resolved measurements at 20 K reveal that the band
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5dffd15736a7f7fc1e0c226239dc110e
https://doi.org/10.1021/jp207621s
https://doi.org/10.1021/jp207621s
Publikováno v:
Journal of Luminescence. 126:257-262
Time resolved photoluminescence (PL) measurements at low temperature are performed on colloidal ZnO nanocrystals dispersed in t-butanol. Considering the particle size dependence of the decay times we conclude that the luminescence is composed of two
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69237f6859d51059e5a9957e5f50b519
https://doi.org/10.1016/j.jlumin.2006.08.055
https://doi.org/10.1016/j.jlumin.2006.08.055
Publikováno v:
Journal of Luminescence. 108:291-295
We have studied the coherent longitudinal acoustic (LA) phonon in a single crystal of pyrite (FeS2) by femtosecond pump and probe spectroscopy. The coherent LA phonon signal is observed as a very clear oscillatory structure in the reflection type pum
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb51e3047973a2787929843f80c68454
https://doi.org/10.1016/j.jlumin.2004.01.062
https://doi.org/10.1016/j.jlumin.2004.01.062
Publikováno v:
High Pressure Research. 23:201-204
The optical heterodyne spectroscopy of optical Kerr effect (OKE) in liquid carbon disulfide (CS2) was performed under various high pressures using a diamond anvil cell (DAC). The relaxation time of orientation was determined up to 1.20 GPa at 295 K u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::62fbf0a9a0fb196dbff5f74deee6e14e
https://doi.org/10.1080/0895795032000102342
https://doi.org/10.1080/0895795032000102342
Publikováno v:
Journal of Luminescence. :687-690
The pressure dependence of low-frequency vibrational density of states, ρ ( ω ), for liquid and crystalline carbon disulfide (CS 2 ) is determined by measurement of light-scattering spectra using diamond anvil cell. In the liquid, a broad band is o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4f6c42dc1e88511403c925edf288e138
https://doi.org/10.1016/s0022-2313(01)00345-3
https://doi.org/10.1016/s0022-2313(01)00345-3
Publikováno v:
physica status solidi (b). 223:325-329
We measured the pressure dependence of polarized transmission spectra on AgGaS2 at 2 K. These spectra show an oscillatory behavior around the zero-birefringence energy E0 where the ordinal and extraordinal refractive indices coincide. Using this osci
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64984b6b4e7b4c23b095372a87e654c0
https://doi.org/10.1002/1521-3951(200101)223:1<325::aid-pssb325>3.0.co
https://doi.org/10.1002/1521-3951(200101)223:1<325::aid-pssb325>3.0.co
Publikováno v:
physica status solidi (b). 211:223-231
Photoluminescence (PL) spectra, time profiles of PL intensity and PL excitation spectra (PLE) for inter 3d multiplets (3d-MS) transition of Mn2 are observed in the semimagnetic semiconductor CdMnTe under high pressures. Those of inter 3d-MS and int
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b7a2fb81b617d53fb14d8c6ecf546219
https://doi.org/10.1002/(sici)1521-3951(199901)211:1<223::aid-pssb223>3.0.co
https://doi.org/10.1002/(sici)1521-3951(199901)211:1<223::aid-pssb223>3.0.co
Publikováno v:
physica status solidi (b). 211:111-116
Time-resolved measurement is performed for photoluminescence around 2.0 eV which originates from internal transition between 3d multiplet states in Mn based semimagnetic semiconductors. Observed emission spectra show red shift with delay time after e
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f5e4e17a8ce5119fe2350c999f376f3b
https://doi.org/10.1002/(sici)1521-3951(199901)211:1<111::aid-pssb111>3.0.co
https://doi.org/10.1002/(sici)1521-3951(199901)211:1<111::aid-pssb111>3.0.co
Publikováno v:
Journal of the Physical Society of Japan. 66:3289-3293
Decay profiles of Mn 2+ photoluminescence in Cd 1- x Mn x Te ( x =0.6) have been investigated under various excitation and observation energies. From the analysis of time resolved spectra, we find that the excited states of d-d transition relax to lo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3ff232e05ee19b7d1feb8b3eab43fd4f
https://doi.org/10.1143/jpsj.66.3289
https://doi.org/10.1143/jpsj.66.3289
Autor:
Sekika Yamamoto, Tomobumi Mishina
Publikováno v:
Physical Review B. 83
Time-resolved luminescence measurements are performed on high-quality ZnO nanocrystals in a quantum confinement regime prepared by fast cooling and succeeding surface passivation. A very long luminescence lifetime of ～0.1 μs, which is indicative o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec568e3d57dbb3e467804a3f498f01f4
https://doi.org/10.1103/physrevb.83.165435
https://doi.org/10.1103/physrevb.83.165435