Abstract
The influence of ( C6H5C2H4NH3)2Pb(Brx I4-x ) concentration on the formation of mixed crystals and optical properties of these materials was investigated. Thin films of microcrystalline ( C6H5C2H4NH3)2Pb(Brx I4-x ) were prepared by the spin-coating method using different concentrations of DMF solutions. Macroscopic inhomogeneity of the composition due to the precipitation of undesired phases could be suppressed by controlling the ( C6H5C2H4NH3)2Pb(Brx I4-x ) concentration. These films showed strong exciton absorption with large (250–430 meV) binding energy due to both the quantum and dielectric confinement effect. Replacing I with Br made it possible to shift the exciton band to the blue region; however, photoluminescence from the mixed crystals gradually broadened with increasing the Br content.
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