Search

Your search keyword '"Brown, Ei E."' showing total 33 results
Start Over Author "Brown, Ei E."
33 results on '"Brown, Ei E."'

12. Comprehensive study of solid pharmaceutical tablets in visible, near infrared (NIR), and longwave infrared (LWIR) spectral regions using a rapid simultaneous ultraviolet/visible/NIR (UVN) + LWIR laser-induced breakdown spectroscopy linear arrays detection system and a fast acousto-optic tunable filter NIR spectrometer

Author

Yang, Clayton S.C, primary, Jin, Feng, additional, Swaminathan, Siva R., additional, Patel, Sita, additional, Ramer, Evan D., additional, Trivedi, Sudhir B., additional, Brown, Ei E., additional, Hommerich, Uwe, additional, and Samuels, Alan C., additional

Published
2017
Full Text
View/download PDF

29. Near-Infrared and Upconversion Luminescence in Er:Y2O3 Ceramics under 1.5 μm Excitation.

Author

Brown, Ei E., Hömmerich, Uwe, Bluiett, Althea, Kucera, Courtney, Ballato, John, Trivedi, Sudhir, and Setlur, A.

Subjects
*LUMINESCENCE, *NEAR infrared radiation, *RARE earth ions, *YTTRIUM, *CERAMIC metals, *DOPING agents (Chemistry)
Abstract

Results of the spectroscopic characteristics and upconversion luminescence in Er3+ doped yttria ( Y2 O3) transparent ceramics prepared by a modified two-step sintering method are presented. The near-infrared (1.5 μm) luminescence properties were evaluated as a function of Er3+ concentration. Judd-Ofelt intensity parameters, radiative rates, branching ratios, and emission lifetimes were determined and compared with results reported for Er3+-doped Y2 O3 single crystal and nanocrystals. Following pumping at 1.532 μm, weak blue (~0.41 μm, 2 H9/2 → 4 I15/2), strong green (~0.56 μm, 2H11/2, 4S3/2 → 4I15/2), and red (~0.67 μm, 4F9/2 → 4I15/2) emission bands were observed as well as weak near-infrared emissions at 0.8 μm (4I9/2 → 4I15/2) and 0.85 μm (4S3/2 → 4I13/2) at room temperature. The upconversion luminescence properties under ~1.5 μm pumping were further investigated through pump power dependence and decay time studies. Sequential two-photon absorption leads to the 4I9/2 upconversion emission, whereas energy-transfer upconversion is responsible for the emission from the higher excited states 2H9/2, 2H11/2, 4S3/2, and 4F9/2. The enhanced red emission with increasing Er3+ concentration most likely occurred via the cross-relaxation process between (4F7/2 → 4F9/2) and (4I11/2 → 4F9/2) transitions, which increased the population of the 4F9/2 level. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results