An initial experimental comparative investigation of direct and indirect up - conversion sensitization of the 1 G level of Tm , Yb 4 co - doped material
نویسنده
چکیده
This paper reports the study of both direct and indirect up-conversion sensitization luminescence phenomenon of the Tm ion’s G level in ZBLAN glass, oxyfluoride glass and pentaphosphate non-crystallite. We found, in the case of 4 indirect up-conversion sensitization, the up-conversion luminescence of Tm Yb La P O non-crystallite is enhanced 0.03 0.18 0.79 5 14 Ž . Ž . up to a level comparable to that of Tm 0.1 Yb 3 :ZBLAN glass. And especially the up-conversion luminescence of Ž . Ž . Tm 0.1 Yb 10.9 :oxyfluoride glass is also enhanced greatly, and its intensity even exceeds slightly that of Ž . Ž . Tm 0.1 Yb 3 :ZBLAN glass. This result is contradicting to a generally accepted concept, i.e. that the up-conversion luminescence of the high cut-off phonon energy’s materials is only about ten thousand times smaller than that of fluoride. Therefore, it is possible to find some materials having both high up-conversion efficiency under indirect up-conversion sensitization and advanced material properties for various up-conversion application. To our knowledge, a similar result has not been reported before. q 2000 Elsevier Science B.V. All rights reserved. PACS: 78.55; 42.55.R; 78.40
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