The invention relates to a process for the synthesis of two-dimensionally-layered-structure represented by the general Formula (I) with improved properties having the advantages of photonic band gap material. The structure of Formula I show enhanced and spectrally controlled/tunable photo-luminescence. Particularly, an ink formulation is created from the annealed powder of the Formula I using a polymer as a binder and organic solvent as a dispersant. wherein, R1 = R2 = R3 = alkyl or alkoxy hydrocarbon X = -CONH or -NH or -COO or -CO or -SO2NH n = 1 or 2 or 3.