White-Light Generation and Energy Transfer in Y2O3:Bi,Eu Phosphor for Ultraviolet Light-Emitting Diodes

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Abstract
Y2−x−yO3:xBi3+,yEu3+ phosphors were prepared by co-precipitation method and characterized by X-ray diffraction and photoluminescence spectra. Under the excitation of 320–350 nm ultraviolet light, these phosphors show three emission bands; the one observed at 612 nm is attributed to Eu3+ and the other two bands were found to center at 410 and 490 nm, which originate from Bi3+ 3P1 →1S0 transitions at two different Y3+ sites. The energy transfer from Bi3+ to Eu3+ is discussed. By appropriate tuning of activator concentration and excitation wavelengths, we obtained white light emission. The results indicate that Y2−x−yO3:xBi3+,yEu3+ are potential phosphors for white light-emitting diode applications.

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