Fig. 2: Excitation-wavelength-dependent colour tuning in GSO. | Nature Communications

Fig. 2: Excitation-wavelength-dependent colour tuning in GSO.

From: Germanium silicon oxide achieves multi-coloured ultra-long phosphorescence and delayed fluorescence at high temperature

Fig. 2

Excitation-emission matrix (EEM) spectra of (a), Sample III and (b), pristine silica measured at room temperature under ambient conditions. Colour bars show normalized PL intensity. c Normalized PL spectra of pristine silica and Sample III under the same annealing procedure. Excitation wavelength = 300 nm. d PL excitation (PLE) spectra and (e) photoluminescence (PL) spectra of GSO. λem emission wavelength. λex excitation wavelength. f PL spectra of GSO powders after thermal annealing at various temperatures (I: 550 °C; II: 700 °C; III: 800 °C; IV: 900 °C) (excitation wavelength: 365 nm for Samples I, II, and III; 254 nm for Sample IV).

Back to article page