Naphthalene　diimides　are　attracting　considerable　interest　because　of　their　tunable　luminescent　properties,　which　are　generally　achieved　by　the　incorporation　of　electron-donating　moieties　into　naphthalene　diimides　core　to　form　donor-acceptor　compounds　through　covalent　bond.　However,　this　method　is　an　elaborate　strategy　because　the　separation　of　byproduct　is　tedious.　Here　we　report　that　the　luminescent　properties　of　naphthalene　diimides　can　be　finely　modulated　by　supramolecular　cocrystal　formation.　Through　the　donor-acceptor　interactions　between　the　electron-deficient　N,N′-di-(4-pyridyl)-1,4,5,8-naphthalene　diimide　(DPNDI)　molecules　and　electron-rich　naphthalene　derivatives　(guest),　a　series　of　cocrystal　complexes　are　successfully　fabricated.　These　cocrystal　complexes　show　guest-dependent　color-tunable　emissions,　which　originate　from　the　excited　state　charge　transfer　interactions　between　the　DPNDI　and　naphthalene　derivatives　in　the　solid　state.　The　present　study　anticipates　providing　a　new　method　for　the　design　of　various　new　types　of　organic　luminescent　materials.　©　2017　Elsevier　Ltd