Abstract
Carbon quantum dots (CQDs) have emerged as promising materials for optoelectronic applications on account of carbon’s intrinsic merits of high stability, low cost, and environment-friendliness. However, the CQDs usually give broad emission with full width at half maximum exceeding 80 nm, which fundamentally limit their display applications. Here we demonstrate multicolored narrow bandwidth emission (full width at half maximum of 30 nm) from triangular CQDs with a quantum yield up to 54–72%. Detailed structural and optical characterizations together with theoretical calculations reveal that the molecular purity and crystalline perfection of the triangular CQDs are key to the high color-purity. Moreover, multicolored light-emitting diodes based on these CQDs display good stability, high color-purity, and high-performance with maximum luminance of 1882–4762 cd m−2 and current efficiency of 1.22–5.11 cd A−1. This work will set the stage for developing next-generation high-performance CQDs-based light-emitting diodes.
Highlights
Carbon quantum dots (CQDs) have emerged as promising materials for optoelectronic applications on account of carbon’s intrinsic merits of high stability, low cost, and environment-friendliness
The starting material PG triangulogen possesses a unique structure with three highly reactive hydrogen atoms at the three metapositions activated by three electron-donating hydroxyl groups in a single molecule, which is a key point for the synthesis of the NBE-triangular CQDs (T-CQDs)
The NBE-T-CQDs are purified via silica column chromatography using a mixture of dichloromethane and methanol as the eluent
Summary
Carbon quantum dots (CQDs) have emerged as promising materials for optoelectronic applications on account of carbon’s intrinsic merits of high stability, low cost, and environment-friendliness. Light-emitting diodes (LEDs) from blue to red based on the bandgap fluorescent CQDs have been reported most recently[18], laying a solid foundation for the development of a new display technology based on the CQDs. despite the intensive work on the electronic and optical properties of CQDs, it has until now remained a widely accepted belief that CQDs can only give broad emission and inferior color-purity with full width at half maximum (FWHM) commonly exceeding 80 nm[15,16,17,18,19,23]. The multicolored LEDs based on the NBE-T-CQDs dispaly high color-purity (FWHM of 30 4n7m6)2acnddmh−ig2ha-npdercfourrmreannt ceeffiwciitehncaym(ηacx)imofu5m.11lucmdiAna−n1c. eM(oLrmeaoxv)eorf, the LEDs demonstrate outstanding stability both on shelf and in operation
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