Fig. 3: Solid emission spectra studies.

Normalized emission spectra of precipitate samples of 2a (p-2a), 2b (p-2b), 2c (p-2c), 2 d (p-2d), 2e (p-2e), and crystalline samples of 2a (c-2a), 2b (c-2b). Inset: photographs of photoluminescence samples under the excitation of λ_ex = 365 nm.