High pH-induced efficient room-temperature phosphorescence from carbon dots in hydrogen-bonded matrices†,Journal of Materials Chemistry C

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High pH-induced efficient room-temperature phosphorescence from carbon dots in hydrogen-bonded matrices†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2018-07-04 00:00:00 , DOI: 10.1039/c8tc02012d
Jing Tan _{1,

2,

3,

4,

5} , Yunxia Ye _{1,

2,

3,

4,

5} , Xudong Ren _{1,

2,

3,

4} , Wei Zhao _{4,

6,

7,

8} , Dongmei Yue _{9,

10,

11}

Affiliation

Carbon dots (CDs) have been promising candidates for metal-free room temperature phosphorescence (RTP) materials recently, but they generally exhibit extremely dim phosphorescence, mainly due to the lack of design guidelines. Herein, we present a new RTP emission enhancing strategy that induces the deprotonation of carboxyl groups on the surfaces of CDs by adjusting the pH to increase the degree of conjugation between the carboxyl group and the carbon core and decrease the surface defect. In addition, for the matrices, the C–O⁻⋯H hydrogen-bonding systems in cyanurate have stronger hydrogen-bonded networks than the C [double bond, length as m-dash]

O⋯H hydrogen-bonding systems in cyanuric acid, minimizing nonradiative transitions of triplet excitons. Notably, their phosphorescence quantum yield (14%) at high pH is nearly 5 times higher than that of CD-based composites under acidic conditions. Furthermore, chemical sensors and light-emitting diodes based on CD-based composites are realized by taking advantage of their efficient dual emission feature.

中文翻译：

高pH诱导的氢键合基质中碳点的高效室温磷光†

碳点（CD）最近成为无金属的室温磷光（RTP）材料的有前途的候选者，但由于缺乏设计指南，它们通常显示出极其暗淡的磷光。在本文中，我们提出了一种新的RTP发射增强策略，该策略通过调节pH值来增加CD-CD与碳核之间的共轭程度并减少表面缺陷，从而诱导CD表面的C-羧基去质子化。此外，对于基体，氰尿酸酯中的C–O ⁻ ⋯H氢键系统比C的氢键网络更强。 [双键，长度为m-破折号]