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Upconversion Luminescence in Er 3+ Doped and Yb 3+ /Er 3+ Codoped Yttria Nanocrystalline Powders
Author(s) -
Zhang Jian,
Wang Shiwei,
Rong Tianjun,
Chen Lidong
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.01072.x
Subject(s) - photon upconversion , nanocrystalline material , materials science , coprecipitation , luminescence , analytical chemistry (journal) , doping , nuclear chemistry , mineralogy , inorganic chemistry , nanotechnology , chemistry , optoelectronics , chromatography
Y 1.9 Er 0.1 O 3 and Y 1.7 Yb 0.2 Er 0.1 O 3 nanocrystalline powders were prepared via a reverse‐strike coprecipitation method using nitrates and ammonia as raw materials. The obtained powders were of cubic‐phase structure of Y 2 O 3 and the particle size was in the range of ∼60–80 nm. Strong red ( 4 F 9/2 – 4 I 15/2 ) and green ( 2 H 11/2 / 4 S 3/2 – 4 I 15/2 ) upconversion luminescence were observed in all the samples when excited with a 980‐nm continuous wave diode laser. The possible upconversion mechanisms in Y 1.9 Er 0.1 O 3 and Y 1.7 Yb 0.2 Er 0.1 O 3 were discussed. Power studies indicated that two‐photon processes are responsible for the green and red upconversion luminescence in these systems. The codoping of Yb 3+ greatly enhanced the red ( 4 F 9/2 – 4 I 15/2 ) upconversion emission.