Rare-Earth Free Self-Activated Graphene Quantum Dots and Copper-Cysteamine Phosphors for Enhanced White Light-Emitting-Diodes under Single Excitation.
作者： Wubin Dai , Yifeng Lei , Man Xu , Pei Zhao , Zhanhui Zhang
DOI: 10.1038/S41598-017-13404-1
关键词:
摘要: Rare-earth (RE) based phosphors are attractive due to their potential applications. However, owing the resource issue, these kinds of expensive and costly. On contrary, as for phosphor-convert white light-emitting-diodes (pc-WLEDs), a solution-processed tunable warm emission LED composite is fabricated in this study under single excitation, with both RE free graphene quantum dots (GQDs) Copper-Cysteamine (Cu-Cy). By using microwave-assisted wet-chemical method graphite raw material, cold fluorescence GQDs obtained. Cu-Cy which shows intense photoluminescence red region has structure where thio amine groups connected copper forming cysteamine. Warm light achieved by mixing two self-activated at weight ratio 1: 1.7 excitation 365 nm. The designed optimal device properties CIE (x, y) = (0.341, 0.327), T = 4436 K, R = 87.9 EQE = 0.31%. experimental results demonstrate that phosphor(s) excited chip can open up new avenue develop much lower WLEDs.
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