One-pot synthesis of nitrogen-doped carbonized polymer dots with tunable emission for multicolor light-emitting diodes

Liuxi Zhao; Xiyue Cao; Xuanfeng Jang; Yuhong Zhang; Bin Shang; Zhengguang Sun; Yuan Zhan

doi:10.1016/j.saa.2023.122815

One-pot synthesis of nitrogen-doped carbonized polymer dots with tunable emission for multicolor light-emitting diodes

Spectrochim Acta A Mol Biomol Spectrosc. 2023 Oct 15:299:122815. doi: 10.1016/j.saa.2023.122815. Epub 2023 May 5.

Authors

Liuxi Zhao¹, Xiyue Cao¹, Xuanfeng Jang¹, Yuhong Zhang¹, Bin Shang², Zhengguang Sun³, Yuan Zhan⁴

Affiliations

¹ Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China.
² State Key Laboratory of New Textile Materials and Advanced Processing Technologies, School of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, China. Electronic address: bshang@wtu.edu.cn.
³ Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China. Electronic address: sunshine@hubu.edu.cn.
⁴ Key Laboratory for the Green Preparation and Application of Functional Materials, Ministry of Education, Hubei Key Laboratory of Polymer Materials, School of Materials Science and Engineering, Hubei University, Wuhan 430062, China. Electronic address: zy@hubu.edu.cn.

PMID: 37196549
DOI: 10.1016/j.saa.2023.122815

Abstract

Carbonized polymer dots (CPDs) have highly potential application value in the field of optoelectronic devices due to their preferable stability, excellent optical properties and low cost. Here, the nitrogen-doped carbonized polymer dots (HNCDs) with self-quenching-resistant fluorescence were prepared via a simple solvothermal method with citric acid, urea and 2-hydroxyethyl methacrylate (HEMA) as raw materials. The structure and optical properties of the HNCDs have been explored in detail by various contrast experiments. The results show that HEMA form the poly(HEMA) to modify on the surface of carbonized core, which can overcome the quenching effect of carbonized core. The nitrogen doping is crucial for the red shift emission of solid-state HNCDs. Furthermore, the HNCDs exhibit concentration-dependent emission and excellent compatibility with silicone sol, which lead to their emission red shifted from blue to red with increasing concentration. The HNCDs were further applied to construct the light-emitting diodes (LEDs), and the multicolor LEDs ranging from blue to red can be prepared by simply varying the type of chips and adjusting the concentration of HNCDs in encapsulating material.

Keywords: 2-hydroxyethyl methacrylate; Carbonized polymer dots; Multicolor LEDs; Nitrogen-doped; Solid-state fluorescence.