Fig. 1. (a) Schematic illustration of the CTE mechanism of non-conventional luminophores. (b) Jablonski diagram for the demonstration of color tunable luminescence in non-conventional luminophores. (c) Photographs of different aqueous d-Xyl solutions taken under 365 nm UV light at room temperature. (d) Photographs of 1 M d-Xyl solution taken at 77 K under various wavelengths of UV light or after stopping the UV irradiation. (e and f) Emission spectra of 1 M d-Xyl solution at 77 K with a td of (e) 0 ms and (f) 40 ms. (g) CIE coordinate diagram of the cryogenic phosphorescence of 1 M d-Xyl with λex changing from 268 to 365 nm.
