Red‐Emitting Delayed Fluorescence and Room Temperature Phosphorescence from Core‐Substituted Naphthalene Diimides. Issue 70 (15th November 2019)

• Record Type: Journal Article
• Authors: Kuila, Suman; Ghorai, Anaranya; Samanta, Pralok K.; Siram, Raja B. K.; Pati, Swapan K.; Narayan, K. S.; George, Subi J.
• Is Part Of: Chemistry. Volume 25:Issue 70(2019)
• Page Start: 16007
• Page End: 16011
• Publication Date: 2019-11-15
• Subjects: charge-transfer -- delayed fluorescence -- donor–acceptor systems -- naphthalenediimide -- phosphorescence; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201904651
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Unprecedented ambient triplet‐mediated emission in core‐substituted naphthalene diimide (cNDI) derivatives is unveiled via delayed fluorescence and room temperature phosphorescence. Carbazole core‐substituted cNDIs, with a donor–acceptor design, showed deep‐red triplet emission in solution processable films with high quantum yield. This study, with detailed theoretical calculations and time‐resolved emission experiments, enables new design insights into the triplet harvesting of cNDIs; an important family of molecules which has been, otherwise, extensively been investigated for its n‐type electronic character and tunable singlet fluorescence. Abstract : Air‐stable, amorphous and purely organic triplet mediated red emission is achieved via delayed fluorescence and room temperature phosphorescence from donor (carbazole) core‐substituted, naphthalene diimide molecules (cNDIs, see figure).