Jpn. J. Appl. Phys. 42 (2003) pp. 6441-6449  |Next Article|  |Table of Contents|
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Thermally Stimulated Processes in Y₂O₃:Eu³⁺ Whiskers Fabricated by Chemical Vapor Deposition

Hikmat Najafov, Yuko Sato, Shigeo Ohshio, Seishi Iida and Hidetoshi Saitoh

(Received May 13, 2003; accepted June 24, 2003; published October 9, 2003)

Luminescence properties of highly <100>-oriented Y₂O₃:Eu³⁺ whiskers obtained by chemical vapor deposition on YSZ substrate have been investigated over a wide temperature range. A considerable thermally stimulated increase of the red Eu³⁺ emission intensity was found under the excitation at the wavelength corresponding to the intrinsic transition within the Eu³⁺ ion, in contrast to the charge-transfer excitation. This behavior is discussed on the basis of the results of the time-decay measurements of the emissions from each electronic level of the ⁵D_J (J=0,1,2) manifold in the temperature range 300–1155 K. A model is proposed in which this thermally stimulated increase is assigned to the multiphonon relaxation from the upper-lying ⁵D_J (J=1,2) levels to the terminal level ⁵D₀, responsible for the intensive red emission.

URL: http://jjap.jsap.jp/link?JJAP/42/6441/
DOI: 10.1143/JJAP.42.6441
KEYWORDS:Y₂O₃, Eu³⁺, rare earth, photoluminescence, photoluminescence excitation, charge transfer excitation, multiphonon relaxation, decay time, whisker, CVD

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