Luminescent Behavior of Bismuth in Rare-Earth Oxides

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Abstract
Activation of rare‐earth oxides by ions other than rare earths is successfully attempted in the present investigation. Bi+3 is incorporated in yttrium, gadolinium, and lanthanum oxides by solid state reaction. Probably a chargetransfer mechanism involving bismuth and oxygen introduces an absorption band at about 3200Aå region. Under 3650Aå radiation shows Bi+3 emission (blue) with a broad‐band spectrum extending from 4500 to 6000Aå and peaking at 5000Aå. When incorporated in phosphors, Bi+3 acts as a sensitizer for Eu+3 emission under 3650Aå radiation. Energy absorbed by bismuth‐oxygen component is transferred by a radiationless process to Eu+3 resulting in the final emission from excited . However, under 2537Aå radiation Bi+3 in acts as a “killer.” Among the three oxide matrices studied, the fluorescence of Bi has been found to be most efficient in host. Reflectance, emission, and excitation spectra of the phosphors are discussed with special reference, to and .

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