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Photochromic Effect in Fe‐Doped PLZT Ceramics
Author(s) -
TANAKA KATSUHIKO,
HAMAKAWA YOSHIHIRO,
WAKING KIKUO,
MURATA MICHIHIRO
Publication year - 1976
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.1151-2916.1976.tb09409.x
Subject(s) - photochromism , ceramic , materials science , transparent ceramics , doping , wavelength , irradiation , impurity , visible spectrum , excitation , mineralogy , photochemistry , optoelectronics , composite material , optics , chemistry , nanotechnology , physics , organic chemistry , engineering , nuclear physics , electrical engineering
The photochromic effect in Fe‐doped transparent PLZT ceramics was investigated. The ceramics are darkened by irradiation with blue light having a wavelength of <4800 Å. The induced dark state is stable at room temperature and can easily be bleached back to its original transparent state by heat treatment at ∼200°C. The photo induced optical density change depends strongly on the transparency of the ceramic. Response times for the darkening and bleaching have been investigated as a function of the excitation light intensity and the temperature of the ceramic. A tentative model explaining the observed effect is proposed, and the photochromic mechanism is discussed on the basis of a charge‐transfer process between the photo activated Fe 3+ and Fe 4+ impurities in the ceramic.