Two-dimensional　organic-inorganic　hybrid　Ruddlesden-Popper　perovskites　have　attracted　a　lot　of　attention　due　to　their　unique　photochemical　properties　and　enhanced　stability　towards　photoluminescence　devices.　Compared　with　three-dimensional　materials,　two-dimensional　perovskites　show　great　potential　for　photoelectric　applications　due　to　their　tunable　band　gap,　great　excitation　binding　energy,　and　large　crystal　anisotropy.　Although　the　synthesis　and　optical　properties　of　BA2PbI4　crystals　have　been　extensively　studied,　the　role　of　their　microstructure　in　photoelectric　applications,　their　electronic　structure,　and　their　electron-phonon　interaction　are　still　poorly　understood.　In　this　paper,　based　on　the　preparation　of　BA2PbI4　crystals,　the　electronic　structure,　phonon　dispersion,　and　vibrational　properties　of　BA2PbI4　crystals　were　revealed　in　detail　with　the　help　of　density　functional　theory.　The　BA2PbI4　stability　diagram　of　formation　enthalpy　was　calculated.　The　crystal　structure　of　the　BA2PbI4　crystals　was　characterized　and　calculated　with　the　aid　of　Rietveld　refinement.　A　contactless　fixed-point　lighting　device　was　designed　based　on　the　principle　of　an　electromagnetic　induction　coil,　and　the　points　with　different　thicknesses　of　BA2PbI4　crystal　were　tested.　It　is　proved　that　the　excitation　peak　of　the　bulk　is　564　nm,　and　the　surface　luminescence　peak　is　520　nm.　Phonon　dispersion　curves　and　the　total　and　partial　phonon　densities　of　states　have　been　calculated　for　the　BA2PbI4　crystals.　The　calculated　results　are　in　good　agreement　with　the　experimental　Fourier　infrared　spectra.　Besides　the　basic　characterization　of　the　BA2PbI4　crystals,　the　photoelectrochemical　properties　of　the　materials　were　also　studied,　which　further　proves　the　excellent　photoelectric　properties　of　the　BA2PbI4　crystals　and　the　broad　application　prospect.　©　2023　The　Royal　Society　of　Chemistry.