Abstract Tuning emission properties of carbon quantum dots (CQDs) is a challenge as limited domain size of sp2 islands in the CQDs restricts electron mobility in one dimension. The result is the formation of often blue and green light-emitting CQDs. The present manuscript depicts the transformation of CQDs into printable ink material and its utilization in fabricating films with tunable emission properties. Excitation and emission spectra of the CQDs were studied in powder form, aqueous suspension, freely suspended polyvinyl alcohol (PVA) film, printed impressions (PIs) and as thin-films respectively. Analysis of spectroscopic and microscopic data showed a substantial near-field effect in powder, CQD-embedded PVA (PVA-CQD) films and PIs. Light-responsive current-voltage characteristics in PVA-CQD films were explained in the light of interparticle-interaction induced near-field effect.

中文翻译：

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使用近场环境调整可印刷碳量子点的光学特性

摘要 调节碳量子点 (CQD) 的发射特性是一项挑战，因为 CQD 中 sp2 岛的有限域尺寸限制了电子在一维的迁移率。结果是形成通常发射蓝色和绿色光的 CQD。本手稿描述了 CQD 向可印刷油墨材料的转化及其在制造具有可调发射特性的薄膜中的应用。分别以粉末形式、水悬浮液、自由悬浮的聚乙烯醇 (PVA) 薄膜、印刷压痕 (PI) 和薄膜形式研究了 CQD 的激发和发射光谱。光谱和微观数据分析表明，粉末、CQD 嵌入的 PVA (PVA-CQD) 薄膜和 PI 具有显着的近场效应。