Fig. 1. Simplified energy state scheme of the organometallic chelate. Insertion: antenna effect. UV, ultraviolet; ET, energy transfer; ISC, intersystem crossing.

Fig. 2. Photo of the fabricated fiber under 355 nm with one end excitation. Insertion: Tb3+-doped PMMA specimen.

Fig. 3. Tb3+-doped PMMA luminescence spectra: (a) excitation spectrum measured at a monitoring of 542 nm and (b) emission spectrum at an excitation of 355 nm.

Fig. 4. Luminescence decay time curve at an excitation of 355 nm and monitoring at 542 nm.

Fig. 5. (a) Normalized luminescence spectrum of a terbium-doped PMMA fiber, (b) spectral attenuation of trivalent terbium-compounds-doped PMMA fibers, and (c) the ratio of the main peaks versus the fiber length.