Effect of dye on luminescent and nonlinear optical properties of bis(4-methoxybenzylammonium) tetra-chlorido cadmate (4MBA2CdCl4) perovskite

Abstract

We report luminescence and optical limiting (OL) applications of pure and doped layered hybrid halide perovskite (LHHP). Rhodamine B (Rh B), an organic laser dye, was doped in bis(4-methoxybenzylammonium) tetra-chlorido cadmate (4MBA2CdCl4). A simple and cost-effective slow solvent evaporation technique was utilized for crystallization of the perovskites. Formation of both pure and doped 4MBA2CdCl4 were confirmed from the X-ray diffraction (XRD) and Fourier transform infrared (FTIR) studies. 4MBA2CdCl4 crystallized as a layered perovskite where organic layers (4MBA+) are sandwiched between the distorted inorganic CdCl4− octahedral layers. The perovskites are thermally stable up to 276 °C and are flexible up to a load of 50 g. Optical absorption of pure perovskite falls in UV region and is highly transparent for visible light. But, inclusion of Rh B reflected a new absorption peak in the visible region. Also, the luminescence under UV excitation of 4MBA2CdCl4 modified due to doping of dye and it exhibit strong golden yellow luminescence. Nonlinear optical (NLO) properties of pure and doped 4MBA2CdCl4 were also studied by Z-scan technique using 785 nm continuous wave (CW) laser. The perovskites exhibited reverse saturable absorption (RSA) and self-defocusing. Further, both perovskites demonstrate optical limiting properties with a low intensity threshold of 0.8 MW/m2. Rh B incorporated 4MBA2CdCl4 exhibit interesting and enhanced photoluminescence and OL behaviours.