Fig. 5: Reversible phase transitions among α-, β-, and G-ETP₂SbCl₅ for recyclable repurposing.

a The schematic diagram for the reversible phase transitions among α-, β-, and G-ETP₂SbCl₅; b The PL spectra and c the corresponding integrated intensities of G-ETP₂SbCl₅ self-healing for 10 cycles; d XRD patterns for the products obtained by the reverse phase transition from G-ETP₂SbCl₅; e Integrated PL intensities of the products by the phase transition between α- and G-ETP₂SbCl₅ for 10 cycles; f PLE and PL spectra of G-ETP₂SbCl₅ before and after 70 °C heating; g Absorption spectra of returned α- and β-ETP₂SbCl₅. The dashed curve represents the absorption profile of commercial YAG:Ce³⁺ phosphor; Photographs of (h) pc-LEDs and i anti-counterfeiting patterns fabricated by the recycled α- and β-ETP₂SbCl₅ phosphors