The　potential　of　organic-inorganic　hybrid　perovskites,　owing　to　their　distinct　photoelectric　attributes　and　boosted　photoluminescence　stability,　has　garnered　substantial　attention.　Despite　comprehensive　examinations　of　the　synthesis　and　optical　characteristics　of　FAPbBr(3)　crystals,　the　understanding　of　their　microstructure＇s　implication　on　photoelectric　applications,　their　electronic　configuration,　and　electron-phonon　interplay　remains　vague.　In　this　study,　we　detailed　the　electronic　configuration,　phonon　dispersion,　and　vibrational　properties　using　density　functional　theory.　We　further　calculated　the　formation　enthalpy　stability　diagram.　Characterization　and　calculation　of　the　crystalline　structure　were　accomplished　via　Rietveld　refinement.　Phonon　dispersion　curves,　as　well　as　total　and　partial　phonon　densities　of　states,　were　also　calculated.　The　theoretical　results　align　well　with　experimental　Fourier　infrared　and　Raman　spectra.　Beyond　elementary　characterization,　we　explored　the　photoelectric　qualities　of　FAPbBr(3)　crystals,　thereby　reaffirming　the　outstanding　photoelectric　attributes　and　extensive　application　potential.　A　non-contact　fixed-point　lighting　device　was　designed　based　on　the　principle　of　electromagnetic　induction　coils,　which　proved　the　uniformity　of　crystal　luminescence.　According　to　the　first　principle,　FAPbBr(3)　possesses　a　Poisson　ratio　of　0.32,　indicative　of　high　flexibility,　emphasizing　their　superb　photoelectric　characteristics　and　vast　application　scope.