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Proceedings Paper

Spectroscopic characterization and upconversion processes under ~1.5 um pumping in Er doped Yttria ceramics
Author(s): Ei E. Brown; Uwe Hommerich; Althea Bluiett; Courtney Kucera; John Ballato; Sudhir Trivedi
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Paper Abstract

We report on the spectroscopic characteristics and upconversion emission in Er3+ doped Yttria (Y2O3) transparent ceramics prepared by a modified two-step sintering method. The near-infrared (1.5 μm) emission properties were evaluated as a function of Er3+ concentration. Judd-Ofelt intensity parameters, radiative rates, branching ratios, and emission lifetimes were calculated and compared with results reported for Er3+ doped Y2O3 single crystal and nanocrystals. Following pumping at 1.532 μm, weak blue (~0.41 μm, 2H9/24I15/2), strong green (~0.56 μm, 2H11/2, 4S3/24I15/2) and red (~0.67 μm, 4F9/24I15/2) emission bands were observed as well as weak near-infrared emissions at 0.8 μm (4I9/24I15/2) and 0.85 μm (4S3/24I13/2) at room temperature. The upconversion emission 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 while 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 (4F7/24F9/2) and (4I11/24F9/2) transitions, which increased the population of the 4F9/2 level.

Paper Details

Date Published: 6 March 2013
PDF: 11 pages
Proc. SPIE 8599, Solid State Lasers XXII: Technology and Devices, 859929 (6 March 2013); doi: 10.1117/12.2002522
Show Author Affiliations
Ei E. Brown, Hampton Univ. (United States)
Uwe Hommerich, Hampton Univ. (United States)
Althea Bluiett, Elizabeth City State Univ. (United States)
Courtney Kucera, Clemson Univ. (United States)
John Ballato, Clemson Univ. (United States)
Sudhir Trivedi, Brimrose Corp. of America (United States)

Published in SPIE Proceedings Vol. 8599:
Solid State Lasers XXII: Technology and Devices
W. Andrew Clarkson; Ramesh Shori, Editor(s)

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