Fig. 1. Effect of UV exposure dose on transmittance and fluorescence spectra of PTR glass samples (sample thickness: 3 mm; nucleation/crystallization conditions: 580 ℃/6 h, 650 ℃/6 h). (a) Effect on transmittance spectra; (b) effect on fluorescence spectra

Fig. 2. Structure and distribution of silver clusters in PTR glass samples (UV exposure dose: 4 J/cm2@315 nm; nucleation/crystallization conditions: 580 ℃/6 h, 650 ℃/6 h). (a) Microscope image of dark field; (b) relationship between size of silver cluster and luminescence band

Fig. 3. Effect of nucleation temperature on PTR glass samples (sample thickness: 3 mm; UV exposure dose: 4 J/cm2@315 nm; nucleation conditions: 570 ℃/6 h, 580 ℃/6 h, 590 ℃/6 h; crystallization conditions: 650 ℃/6 h). (a) Effect on transmission spectra; (b) effect on fluorescence spectra; (c) effect on absorption peak; (d) effect on fluorescence lifetime

Fig. 4. Effect of crystallization time on PTR glass samples (sample thickness: 3 mm; UV exposure dose: 4 J/cm2@315 nm; nucleation conditions: 580 ℃/6 h; crystallization temperature: 650 ℃). (a) Effect on transmission spectra; (b) effect on fluorescence spectra

Fig. 5. HR-TEM image and selected area electron diffraction pattern of PTR glass (sample thickness: 3 mm; UV exposure dose: 4 J/cm2@315 nm; nucleation/crystallization conditions: 580 ℃/6 h, 650 ℃/6 h). (a) HR-TEM image; (b) selected area electron diffraction pattern