Defects Dominated Regulation of Fluorescence Properties of Copper Nanoclusters

Abstract At present, many studies have suggested that during the luminescence process of Cu nanoclusters, the increase of metal defects can further enhance the emission, but the lack of understanding of the defect luminescence principle makes it tough to further adjust the emissions of luminescence and achieve multicolor luminescence. Herein, the 2D assembled sheet materials are modified with surface or deep defects. Metal defects affect the luminous energy level by regulating the optical properties of 2D assembled materials and regulating the detailed progress of exciton radiation action. Further more, research shows that continuous adjustment of the emission color can be achieved by only regulating the ingredient of surface defects and deep metal defects, and such surface metal defects have a lighter level and multiple sub-levels, which broadens the luminescent color. Finally, white light emitting diodes (WLEDs) with warm, cool and pure white color temperatures were achieved for illuminating applications used the full-color luminescence of Cu clusters.