Fig. 1. (a) PL spectra. (b) Spectra plotted as (αhν)2−hν of Gd-doped CsPbCl1.5Br1.5 NCs glasses. (c) Photos of a series of Gd-doped CsPbCl1.5Br1.5 NCs glasses (S1–S4) (from left to light) in daylight and ultraviolet (UV) light.

Fig. 2. (a) TEM image of Gd-doped CsPbCl1.5Br1.5 NCs glass. (b) HRTEM image of CsPbCl1.5Br1.5 NCs glass (S1). (c) HRTEM image of Gd-doped CsPbCl1.5Br1.5 NCs glass (S3). (d) XRD patterns of Gd-doped CsPbCl1.5Br1.5 NCs glasses. (e)–(j) EDS elemental mappings of Gd-doped CsPbCl1.5Br1.5 NCs glass.

Fig. 3. (a) XRD patterns, (b) PL spectra, (c) UV-vis absorption spectra. (d) Spectra plotted as (αhν)2−hν of Gd-doped CsPbCl1.5Br1.5 NCs glasses (470°C–530°C).

Fig. 4. (a) PL intensity measured during heating, cooling, and reheating. (b) Time-dependent PL intensity. (c) Luminescent photographs of S3 stored in water for different times.

Fig. 5. (a), (c), (e), (g) Pump intensity-dependent PL spectra under increasing 800 nm fs pulsed excitation fluence from the Gd-doped CsPbCl1.5Br1.5 NCs glasses (S1–S4). (b), (d), (f), (h) Dependence of the integrated emission intensity (blue lines) and FWHM (red lines) of the emission spectra as a function of pumping density under 800 nm fs laser excitation (S1–S4).

Fig. 6. (a)–(c) Pump intensity-dependent PL spectra under increasing 800 nm fs pulsed excitation fluence from the Gd-doped CsPbCl1.5Br1.5 NCs glasses (470°C–530°C). (d)–(f) Dependence of the integrated emission intensity (blue lines) and FWHM (red lines) of the emission spectra as a function of pumping density under 800 nm fs laser excitation (470°C–530°C).