Author(s): Yang, YS (Yang, Yongsheng); Liu, ZD (Liu, Zhiduo); Chen, D (Chen, Da); Gu, BL (Gu, Bingli); Gao, B (Gao, Bo); Wang, ZH (Wang, Zihao); Guo, QL (Guo, Qinglei); Wang, G (Wang, Gang)

Source: JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY Volume: 405 Article Number: 112977 DOI: 10.1016/j.jphotochem.2020.112977 Published: JAN 15 2021

Abstract: In this work, nitrogen-doped graphene quantum dots (N-GQDs) with high blue fluorescence are synthesized by the one-pot hydrothermal method from benzimidazoles. The as-fabricated N-GQDs possess a homogeneous size of 3.8 nm, good crystallinity, pip photostability, good water soluble, and a high quantum yield of about 25 %. In addition, it is found that the fluorescence of N-GQDs can be obviously quenched by tetracycline (TC) and elevated temperature. The detection of TC is implemented, with a detection limit of 0.21 mu mol L-1. For the temperature sensing, the fluorescence intensity shows a linear reduction between 25 degrees C and 100 degrees C. Moreover, reversible and stable abilities of temperature sensing are demonstrated. Owing to the superior optoelectronic properties, white light emitting diodes (WLEDs) using the N-GQDs as the phosphor are fabricated, and the CIE coordinates is (0.357, 0.315) with the color temperature of 4427 K. The results reported here will expand the multiple applications of N-GQDs in environment monitoring, biosensing engineering and optoelectronic devices.

Accession Number: WOS:000596168400006

ISSN: 1010-6030

Full Text: https://www.sciencedirect.com/science/article/pii/S1010603020307747?via%3Dihub