Spectroscopic characterization and upconversion processes under ~1.5 um pumping in Er doped Yttria ceramics

Ei E. Brown; Uwe Hommerich; Althea Bluiett; Courtney Kucera; John Ballato; Sudhir Trivedi

doi:10.1117/12.2002522

6 March 2013 Spectroscopic characterization and upconversion processes under ~1.5 μm pumping in Er doped Yttria ceramics

Ei E. Brown, Uwe Hommerich, Althea Bluiett, Courtney Kucera, John Ballato, Sudhir Trivedi

Author Affiliations +

Proceedings Volume 8599, Solid State Lasers XXII: Technology and Devices; 859929 (2013) https://doi.org/10.1117/12.2002522
Event: SPIE LASE, 2013, San Francisco, California, United States

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, ²H_9/2→⁴I_15/2), strong green (~0.56 μm, ²H_11/2, ⁴S_3/2→⁴I_15/2) and red (~0.67 μm, ⁴F_9/2→⁴I_15/2) emission bands were observed as well as weak near-infrared emissions at 0.8 μm (⁴I_9/2→⁴I_15/2) and 0.85 μm (⁴S_3/2→⁴I_13/2) 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 ⁴I_9/2 upconversion emission while energy transfer upconversion is responsible for the emission from the higher excited states ²H_9/2, ²H_11/2, ⁴S_3/2, and ⁴F_9/2. The enhanced red emission with increasing Er³⁺ concentration most likely occurred via the cross-relaxation process between (⁴F_7/2 → ⁴F_9/2) and (⁴I_11/2 → ⁴F_9/2) transitions, which increased the population of the ⁴F_9/2 level.

Citation Download Citation

Ei E. Brown, Uwe Hommerich, Althea Bluiett, Courtney Kucera, John Ballato, and Sudhir Trivedi "Spectroscopic characterization and upconversion processes under ~1.5 μm pumping in Er doped Yttria ceramics", Proc. SPIE 8599, Solid State Lasers XXII: Technology and Devices, 859929 (6 March 2013); https://doi.org/10.1117/12.2002522

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