Designing efficient room-temperature phosphorescence (RTP) carbon dots (C-dots) without the need of an additional matrix is important for various applications. Herein, matrix-free and highly efficient C-dots with yellow-green RTP emission have been successfully synthesized towards information encryption and decryption. Phytic acid (PA) and triethylenetetramine are used as molecular precursors, and a facile microwave-assisted heating method is selected as synthesis method. The obtained C-dots exhibit a maximum phosphorescence emission at around 535 nm under an excitation wavelength of 365 nm and a long average lifetime up to 750 ms (more than 9 s to the naked eye). PA containing six phosphate groups and serving as P source plays a significant role in producing the RTP C-dots. Furthermore, potential applications of the RTP C-dots in the field of information encryption and decryption are successfully demonstrated.

中文翻译：

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不含矩阵且高效的室温磷光碳点，用于信息加密和解密。

设计高效的室温磷光（RTP）碳点（C-dots）而不需要额外的基质对于各种应用很重要。在此，已经成功地合成了具有黄绿色RTP发射的无矩阵且高效的C点，用于信息加密和解密。植酸（PA）和三亚乙基四胺被用作分子前体，并且选择了一种简便的微波辅助加热方法作为合成方法。所获得的C点在365 nm的激发波长下在535 nm处显示最大的磷光发射，并且平均寿命长达750 ms（肉眼超过9 s）。包含六个磷酸基团并用作P源的PA在产生RTP C点中起着重要作用。此外，