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Fig. 2. (a) The solid-state luminescence of 1-Y, Eu0.1Y0.9 and Tb0.1Y0.9 (λex = 275 nm). (b) CIE chromaticity diagram for 1-Y, Eu0.1Y0.9 and Tb0.1Y0.9. Inset: photographs of (1) 1-Y, (2) Eu0.1Y0.9 and (3) Tb0.1Y0.9 under ultraviolet light of 365 nm.