Photochromic effect in magnesium-doped α-Al[sub 2]O[sub 3] single crystals

Tardıo, M.; Ramırez, R.; González, R.; Chen, Y.; Kokta, M. R.
August 2003
Applied Physics Letters;8/4/2003, Vol. 83 Issue 5, p881
Academic Journal
A reversible photochromic effect was investigated in Mg-doped α-Al[SUB2]O[SUB3] single crystals oxidized at elevated temperatures. Alternate illumination with blue and UV light at T ⩽ 210 K results in reversible disappearance and reappearance of a gray-purple coloration, respectively. The coloration can also be fully rejuvenated by warming the crystal to T ⩾ 215 K.


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