Engineering triangular carbon quantum dots with unprecedented narrow bandwidth emission for multicolored LEDs.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 29884873.
- Also identified by DOI 10.1038/s41467-018-04635-5 and PMC identifier 5993800.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
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<sup>-2</sup> and current efficiency of 1.22-5.11 cd A<sup>-1</sup>. This work will set the stage for developing next-generation high-performance CQDs-based light-emitting diodes.