Throughout the crystal, the presence of free-exciton emission (PL FE ) is almost insignificant.
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Synthesis, Structural, Linear, and Nonlinear Optical Studies of Inorganic-Organic Hybrid Semiconductors (R-C<sub>6</sub>H<sub>4</sub>CHCH<sub>3</sub>NH<sub>3</sub>)<sub>2</sub>PbI<sub>4</sub>, (R = CH<sub>3</sub>, Cl).
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