Violet-emitting　perovskite　quantum　dots　(QDs)　are　of　great　significance　for　theoretical　and　experimental　research　aimed　at　promoting　the　development　of　environmentally　friendly　violet　light-emitting　diodes　(LEDs).　Nevertheless,　the　synthesis　of　violet　perovskite　QDs　via　ligand-assisted　reprecipitation　is　challenging　due　to　the　significant　bandgap.　A　simple　and　economical　cryo-bonding　ligand-assisted　reprecipitation　(Cb-LARP)　method　is　proposed　as　a　means　of　synthesizing　deep　violet　lead-free　organic-inorganic　hybrid　perovskite　(OIHP)　QDs,　with　the　objective　of　increasing　the　bandgap　in　the　material.　The　MA3Bi2Br9　QDs　synthesized　by　the　Cb-LARP　method　exhibit　bright　violet　luminescence　at　400　nm,　with　a　PLQY　of　50.1%.　Moreover,　the　photoluminescence　peak　of　the　QDs　can　be　adjusted　from　402　to　393　nm　by　modifying　the　final　reaction　time.　It　is　noteworthy　that　the　MA3Bi2Br6Cl3　QDs　exhibited　ultraviolet　emission　at　379　nm,　corresponding　to　a　PLQY　of　35.4%.　Similarly,　the　emission　peak　of　the　QDs　can　be　tuned　from　379　to　376　nm　by　changing　the　final　reaction　time.　The　results　demonstrate　that　the　deep　violet　emitting　OIHP　QDs　have　been　successfully　synthesized.　This　study　provides　a　theoretical　reference　for　short-wavelength　perovskite　materials　and　an　experimental　reference　for　the　study　of　violet　and　UV　quantum-dot　light-emitting　diode　devices.　©　2024　Wiley-VCH　GmbH.