Organic-inorganic　hybrid　halide　materials　have　emerged　as　promising　candidates　for　advanced　optoelectronic　applications　due　to　their　unique　structural　and　optical　properties.　In　this　study,　we　explored　the　photoluminescence　(PL)　properties,　stability,　and　photophysical　mechanism　of　[EMPA]2Pb3Br12　crystal,　(EMPA　=　5-((4-ethylpiperazin-1-yl)methyl)pyridin-2-amine).　This　zero-dimensional　hybrid　halide　exhibits　broad　white-light　emission　with　a　high　photoluminescence　quantum　yield　of　19.0%　and　a　high　color　rendering　index　(CRI)　of　90.　Temperature-dependent　PL　spectra　reveal　a　dual-emission　mechanism,　where　delocalized　excitons　dominate　at　room　temperature,　while　self-trapped　excitons　contribute　significantly　at　lower　temperatures　due　to　lattice　relaxation　and　suppressed　nonradiative　decay.　White-light-emitting　diode　devices　fabricated　using　[EMPA]2Pb3Br12　as　a　phosphor　achieve　bright　white　light　with　CRI　of　89.　These　findings　highlight　[EMPA]2Pb3Br12　as　a　promising　candidate　for　next-generation　solid-state　lighting　and　display　technologies,　combining　high　performance　with　remarkable　durability.