Accessing the long-lived near-IR-emissive triplet excited state in naphthalenediimide with light-harvesting diimine platinum(ii) bisacetylide complex and its application for upconversion†
Abstract
Room temperature near-IR phosphorescence of naphthalenediimide (NDI) was observed with N⁁NPt(II) bisacetylide complex (Pt-NDI) in which the NDI was connected to Pt(II) center viaacetylide. Pt-NDI shows intense absorption of visible light and long-lived NDI-localized excited state (3IL) (τT = 22.3 μs). Pt-NDI was used as a triplet sensitizer for upconversion.