祝贺向卫东和梁晓娟老师指导研究生在rsc advances上发表学术论文-威尼斯人888

标题：solvatochromism of bright carbon dots with tunable long-wavelength emission from green to red and their application as solid-state materials for warm wleds

abstact：herein, we present a facile approach to produce long-wavelength emitting carbon dots (cds). a shift of the fluorescence emission wavelength of cds from 630 nm to 520 nm can be easily acquired. the assynthesized cds exhibit concentration-dependent pl property as well as the “solvatochromism” phenomenon, which are rarely known in cds. as the concentration or solvent polarity of the cds increases, the photoluminescence (pl) wavelength exhibits a red shift. more importantly, the qy of these long-wavelength cds is as high as 52.4%, which is considerably higher than that mentioned in other reports. moreover, on addition of an acid (hcl), the surface h-functionalization on the cds leads to strong quenching of fluorescence emission, which is almost reversible after the addition of a strong base (naoh). then, cds based solid-state composites were fabricated using a combination of polyvinyl butyral (pvb) and cds. finally, cds/pvb composites were deposited on the ce3 :y3al5o12 (ce3 :yag) phosphor-in-glass (ce-pig) via a screen-printing technology. warm white light-emitting diodes (wleds) were then fabricated using these materials and gan chips. the results indicate that these cds possess a potential for future applications in warm wleds

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