Ultraviolet upconversion emissions at 262, 276, 308 and 320 nm were observed from Er3+-doped Y2O3with a 532 nm continuous wave compact solid-state laser excitation. Power-dependence analysis demonstrates that two-photon upconversion process populates the4D5/2,2H9/2and2P3/2states. The energy transfer upconversion (ETU) plays an important role in populating4D5/2and2P3/2states. It appears that2P3/2state population originates from ETU2H11/2+2H11/2→4I13/2+2P3/2, moreover, a subsequent excited state absorption (ESA) from the4I9/2level. © 2009 Elsevier B.V. All rights reserved.
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