A visible-light-excited afterglow achieved by carbon dots from rhodamine B fixed in boron oxide,Journal of Materials Chemistry C

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A visible-light-excited afterglow achieved by carbon dots from rhodamine B fixed in boron oxide
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020/02/20 , DOI: 10.1039/c9tc05992j
Zhigang Xu _{1,

2,

3,

4} , Xiaobo Sun _{1,

2,

3,

4} , Panpan Ma _{1,

2,

3,

4} , Yanqiu Chen _{1,

2,

3,

4} , Wei Pan _{1,

2,

3,

4} , Jinping Wang _{1,

2,

3,

4}

Affiliation

Visible light as an excitation source has less phototoxicity toward health, and more accessibility for practical applications as compared to ultraviolet light does. However, obtaining visible-light-excited afterglow materials based on carbon dots is a formidable challenge as such materials have not emerged thus far. Herein, visible-light-excited thermally-activated delayed fluorescence combined with phosphorescence were achieved by embedding green emissive carbon dots (G-CDs) with an ultra-high quantum yield in the matrix of boron oxide. G-CDs were synthesized via the hydrothermal pyrolysis of rhodamine B in the aqueous solution of NaOH. The ultra-long afterglow can last for 13 s after the removal of the excitation source (UV or visible light). The afterglow lifetime of the G-CD/B₂O₃ composite at the emission wavelength of 480 nm is 477.96 ms at room temperature, and 805.94 ms at 273 K. Given these features, information security, afterglow projection and photo writing were successfully realized in the G-CD/B₂O₃ composite-based materials using a cellphone or electric torch light as a light source.

中文翻译：

固定在氧化硼中的若丹明B的碳点产生的可见光激发余辉

与紫外线相比，可见光作为激发源对健康的光毒性较小，并且在实际应用中具有更大的可及性。然而，获得基于碳点的可见光激发余辉材料是一个艰巨的挑战，因为到目前为止还没有出现这种材料。本文中，通过将具有超高量子产率的绿色发射碳点（G-CD）嵌入氧化硼基质中，实现了可见光激发的热激活延迟荧光与磷光的结合。G-CD通过罗丹明B在NaOH水溶液中的水热解合成。去除激发源（紫外线或可见光）后，超长余辉可以持续13 s。G-CD / B ₂ O的余辉寿命在室温下，发射波长为480 nm的_3种复合材料在室温下为477.96 ms，在273 K下为805.94 ms。鉴于这些特性，在G-CD / B₂ O₃复合材料中成功实现了信息安全性，余辉投影和照片写入。使用手机或电筒灯作为光源的基础材料。

更新日期：2020-04-03

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