The　prominent　light-matter　interaction　in　2D　materials　has　become　a　pivotal　research　area　that　involves　either　an　archetypal　study　of　inherent　mechanisms　to　explore　such　interactions　or　specific　applications　to　assess　the　efficacy　of　such　novel　phenomena.　With　scientifically　controlled　light-matter　interactions,　various　applications　have　been　developed.　Here,　we　report　four　diverse　applications　on　a　single　structure　utilizing　the　efficient　photoresponse　of　Bi2O2Se　with　precisely　tuned　multiple　optical　wavelengths.　First,　the　Bi2O2Se-based　device　performs　the　function　of　optoelectronic　memory　using　UV　(lambda　=　365　nm,　1.1　mW　cm(-2))　for　the　write-in　process　with　SiO2　as　the　charge　trapping　medium　followed　by　a　+1　V　bias　for　read-out.　Second,　associative　learning　is　mimicked　with　wavelengths　of　525　nm　and　635　nm.　Third,　using　similar　optical　inputs,　functions　of　logic　gates　＂AND＂,　＂OR＂,　＂NAND＂,　and　＂NOR＂　are　realized　with　response　current　and　resistance　as　outputs.　Fourth　is　the　demonstration　of　a　4　bit　binary　to　the　decimal　converter　using　wavelengths　of　740　nm　(LSB),　595　nm,　490　nm,　and　385　nm　(MSB)　as　binary　inputs　and　output　response　current　regarded　as　equivalent　decimal　output.　Our　demonstration　is　a　paradigm　for　Bi2O2Se-based　devices　to　be　an　integral　part　of　future　advanced　multifunctional　electronic　systems.