Zobrazeno 1 - 10
of 19
pro vyhledávání: '"R. J. M. da Fonseca"'
Publikováno v:
Cerâmica, Vol 52, Iss 322, Pp 200-204 (2006)
São apresentados resultados de fotoluminescência do MgGa2O4:Ni2+ nas temperaturas ambiente e de nitrogênio líquido. As bandas observadas são atribuídas às transições proibidas por spin, ¹T2 (¹D) -> ³T2 (³F) e ¹T2 (¹D) -> ³T1 (³F), no
Externí odkaz:
https://doaj.org/article/638133c5bf8d4a4b8336eaca5ad29d6f
Publikováno v:
Optical Materials. 64:323-326
The optical properties of Mn 3+ ions in the elpasolites Cs 2 NaGaF 6 and Cs 2 NaAlF 6 have been investigated by absorption spectroscopy at 4.2 K. The absorption spectra are dominated by the spin-allowed 5 E → 5 T 2 transition and the transition bet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83b59b91597f6694dc0c0564b62b34c5
https://doi.org/10.1016/j.optmat.2016.12.026
https://doi.org/10.1016/j.optmat.2016.12.026
Publikováno v:
Journal of Physics and Chemistry of Solids. 68:22-25
Cr 3+ centers in MgGa 2 O 4 powder samples are investigated by excitation and emission spectroscopic measurements at 4.2, 77 and 300 K. The 2 E( 2 G)→ 4 A 2 ( 4 F) and 4 T 2 ( 4 F)→ 4 A 2 ( 4 F) electronic transitions are observed in the red and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::146868406b255aedff76acc72f19a626
https://doi.org/10.1016/j.jpcs.2006.08.002
https://doi.org/10.1016/j.jpcs.2006.08.002
Publikováno v:
Matéria (Rio de Janeiro). 12:276-283
Amostras policristalinas de MgGa2O4 dopadas com Cr3+ são investigadas por espectroscopia de luminescência e luminescência de excitação sob as temperaturas 4,2 K, 77 K e ambiente. Nos espectros observamos bandas de fotoluminescência nas regiões
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ae1ae9d85313eaac379ed82d1fa5bcdc
https://doi.org/10.1590/s1517-70762007000200005
https://doi.org/10.1590/s1517-70762007000200005
Publikováno v:
Cerâmica. 52:200-204
São apresentados resultados de fotoluminescência do MgGa2O4:Ni2+ nas temperaturas ambiente e de nitrogênio líquido. As bandas observadas são atribuídas às transições proibidas por spin, ¹T2 (¹D) -> ³T2 (³F) e ¹T2 (¹D) -> ³T1 (³F), no
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa54e64090305ad1d4e005c01160ded7
https://doi.org/10.1590/s0366-69132006000200013
https://doi.org/10.1590/s0366-69132006000200013
Autor:
Geoffrey F. Strouse, A. Dias Tavares, Lilian P. Sosman, R. J. M. da Fonseca, Khalid M. Hanif, Heloisa N. Bordallo, Xiaoping Wang
Publikováno v:
Journal of Physics: Condensed Matter. 14:12383-12389
Single crystals of 0.5% Cr3+-doped Cs2NaGaF6 were studied by means of x-ray diffraction and polarized Raman scattering. The crystal exhibits a unique stacking interaction, with a hexagonal structure with Rm symmetry. Polarized Raman spectra recorded
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::93b86cc5eb055b2e605be4add5bb9bf9
https://doi.org/10.1088/0953-8984/14/47/312
https://doi.org/10.1088/0953-8984/14/47/312
Publikováno v:
Solid State Communications. 114:661-665
Emission and excitation spectra for Cs2NaAlF6:Cr3+ are presented. The near-infrared fluorescence observed at 77 and 4.2 K are attributed to the zero-phonon spin-forbidden transition 2 E ( 2 G )→ 4 A 2 ( 4 F ) while at room-temperature the emission
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a3710f123e485f8671c04dfbc71d01a
https://doi.org/10.1016/s0038-1098(00)00107-1
https://doi.org/10.1016/s0038-1098(00)00107-1
Publikováno v:
Journal of Fluorescence. 10:375-381
Interest in 3d transition metal impurities in ionic crystals has increased due to their important role in the laser activity of these materials. Moreover, recent advances in tunable solid-state lasers and high-power semiconductor laser diode arrays h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::819b834c917098d1edb0b4ef195efc22
https://doi.org/10.1023/a:1009430530367
https://doi.org/10.1023/a:1009430530367
Publikováno v:
Solid State Communications. 110:519-524
Two different Cr3+ crystal-field sites in the elpasolite Cs2NaGaF6 were investigated by excitation and emission spectroscopy at 4.2, 77 and 300 K. The zero-phonon lines of the 2E→4A2 transition are clearly observed on time-resolved emission spectra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4487441daf2fc97dfebbc96ef54551d
https://doi.org/10.1016/s0038-1098(99)00008-3
https://doi.org/10.1016/s0038-1098(99)00008-3
Autor:
T. Abritta, R. J. M. Da Fonseca
Publikováno v:
Physica B: Condensed Matter. 190:327-332
The luminescence of LiGa5O8:Mn4+ was observed with measurements of decay times and intensities for different temperatures. The experimental results were analysed taking into account purely radiative, vibronic and radiationless transitions. It is show
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::251dc089a11d71c3244522062733c695
https://doi.org/10.1016/0921-4526(93)90192-9
https://doi.org/10.1016/0921-4526(93)90192-9