希土類ドープセルシアン結晶のトリボ発光(<特集>セラミック材料)

概要

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Triboluminescence has been observed in BaAl_2Si_2O_8 and SrAl_2Si_2O_8 doped with Eu^<2+> and Dy^<3+>. From comparison between photoluminescence and triboluminescence spectra, it is found that the emission intensity due to the 4f-4f transition of Dy^<3+> is larger in triboluminescnece than in photoluminescence. It is thought that the crystal field is distorted around the rate earth ions which bring about the triboluminescence;the distorted crystal fields increase the transition propability of partly-forbidden 4f-4f transitions of Dy^<3+>. On the other hand, the broad band due to the 4f-5d transition of Eu^<2+> shifts to longer wavelengths in the triboluminescence than in the photoluminescence. An increase in splitting of 5d levels and Stokes are possible origins for this phenomenon.
社団法人日本材料学会の論文
2000-06-15