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Erschienen in:
31.01.2018
Tuning of Bi3+-related photoemission in the Sc2O3:Bi3+ phosphor
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 8/2018
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Abstract
In this work, we report a kind of UV converted single-phased tunable Sc2O3:Bi3+ phosphor, which enables generating the color tuning from blue to green upon excitation at the wavelength range of 245–380 nm. The photoluminescence (PL) spectra reveal that the tunable colors are due to regular modulation of the photoemission intensity between three Bi3+-related luminescence centers (i.e., ~ 356 nm for Bi1, ~ 407 nm for Bi2, and ~ 489 nm for Bi3), leading to the color tuning forth and back between blue and green. Together with the structural analysis, our spectral results indicate that the three Bi3+-related centers come from three different Sc3+ sites and, more importantly, two of them [i.e., Bi3 and Bi2], which locate respectively at the same Sc3+ sites of the crystal lattice with the point symmetry C2 and C
3i
, feature controllable yet inefficiency energy transfer behavior. A possible mechanistic scheme, which bases on the PL observations, is constructed to illustrate the Bi3+-related color tuning more clearly.