Reversible photoinduced spectral change in Eu[sub 2]O[sub 3] at room temperature

Mochizuki, Shosuke; Nakanishi, Tauto; Suzuki, Yuya; Ishi, Kimihiro
December 2001
Applied Physics Letters;12/3/2001, Vol. 79 Issue 23, p3785
Academic Journal
When Eu[sub 2]O[sub 3] powder compact and film are irradiated with ultraviolet (UV) laser light in a vacuum, their photoluminescence (PL) spectra change from a red sharp-line structure to a white broad band, which can be clearly seen with the naked eye. After removing the UV laser light, the white PL continues for more than several months at room temperature under room light, in spite of any changes of atmosphere. By irradiating with the same UV laser light at room temperature under O[sub 2] gas atmosphere, the original red PL state reappears. Such a reversible phenomenon may well yield materials for white-light-emitting devices and erasable optical storage. © 2001 American Institute of Physics.


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