Carbon Dots with\nCharge Storage Ability Promote the\nRed Emission of TFB via Carrier Secondary Injection

Dual-emission light-emitting diodes (DEDs) have great\npromising\napplications in medical imaging, optical communication, data storage,\nand three-dimensional display. The precise material design and advanced\npackaging technology for the construction of DEDs are still key challenges\nfor practical application. We demonstrate a straightforward strategy\nto construct DEDs that deviates from traditional approaches, utilizing\ncommercially available luminescent material of poly(9,9-dioctylfluorene-<i>co</i>-<i>N</i>-(4-(3-methylpropyl))diphenylamine)\n(TFB) and carbon dots (CDs). In the DEDs, the mixture of CDs and TFB\nwas used as the luminescent layer, which exhibits dual-wavelength\nemission located at 436 and 632 nm, respectively. Notably, the CDs,\nwith charge storage ability, can store the interfacial charges, reinject\nthe carriers into TFB, and then facilitate the long-wavelength (632\nnm) emission from TFB. This work provides a new way for the design\nand construction of fresh DEDs through the CD-based interfacial charge\ntransport process.