Long‐Range Charge Transportation Induced Organic Host–Guest Dual Color Long Persistent Luminescence. Issue 24 (23rd September 2021)

• Record Type: Journal Article
• Authors: Huang, Guanheng; Deng, Ziqi; Pang, Junhong; Li, Jinghong; Ni, Shaofei; Li, Jian‐An; Zhou, Chen; Li, Hailin; Xu, Bingjia; Dang, Li; Li, Ming‐De
• Is Part Of: Advanced optical materials. Volume 9:Issue 24(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-23
• Subjects: host–guest supramolecules -- room temperature phosphorescence -- space charge transfer -- thermally activated delayed fluorescence -- ultrafast spectroscopy; Optical materials -- Periodicals; Photonics -- Periodicals; 620.11295
• DOI: 10.1002/adom.202101337
• Languages: English
• ISSNs: 2195-1071

Abstract

Abstract: Long persistent luminescence (LPL) can store light energy in excited states and gradually release it as light. Organic host–guest systems provide a good platform for LPL, and single‐color LPL is often achieved while multicolor LPL is challengeable. Here host–guest supramolecular complexes are presented with dual LPL emissions: thermally activated delayed fluorescence (TADF) (≥100 ms) and room temperature phosphorescence (RTP). A space charge transfer from α‐cyclodextrin to diphenylacetylene (DPA) with long‐range transportation (2.32 mm) carrier along DPA strand in the supramolecular complexes is attributed to generate the TADF and RTP. Fortunately, these supramolecular complexes are readily fabricated from α‐cyclodextrin and DPA or DPA derivatives. The gradient color is observed after removing UV excitation. Furthermore, the hydrophobic property inside α‐cyclodextrin makes the LPL appear by water shedding and disappear by organic solvent infiltration, showing the character of a "switch." This host–guest space charge transfer strategy paves a way to design LPL materials. Abstract : This study reveals host–guest supramolecular complexes with dual long persistent luminescence (LPL) emissions: thermally activated delayed fluorescence (TADF) (≥100 ms) and room temperature phosphorescence (RTP). A space charge transfer from α‐cyclodextrin to diphenylacetylene (DPA) with long‐range transportation carrier along DPA strand in the supramolecular complexes is attributed to generate the ultralong TADF and RTP.