Facile Preparation of Stable Solid-State Carbon Quantum Dots with Multi-Peak Emission

Yanning Zheng; Jingxia Zheng; Junli Wang; Yongzhen Yang; Taiping Lu; Xuguang Liu

doi:10.3390/nano10020303

Facile Preparation of Stable Solid-State Carbon Quantum Dots with Multi-Peak Emission

Nanomaterials (Basel). 2020 Feb 10;10(2):303. doi: 10.3390/nano10020303.

Authors

Yanning Zheng¹, Jingxia Zheng¹, Junli Wang¹, Yongzhen Yang¹, Taiping Lu¹, Xuguang Liu^{1

2}

Affiliations

¹ Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China.
² Institute for New Carbon Materials, Taiyuan University of Technology, Taiyuan 030024, China.

Abstract

Aggregation-caused quenching (ACQ) effect, known as the main cause to restrain solid-state luminescence of carbon quantum dots (CQDs), hinders further application of CQDs in white light-emitting diodes (WLED). Here, a complex of CQDs and phthalimide crystals (CQDs/PC) was prepared through a one-step solvothermal method. CQDs/PC prevented CQDs from touching directly by embedding the CQDs in phthalimide crystal matrix in situ, which effectively reduced the ACQ effect. Furthermore, CQDs/PC exhibited multi-peak fluorescence spectra that span the green, yellow and orange spectral regions. Finally, a WLED fabricated based on CQDs/PC achieved a color-rendering index of 82 and a correlated color temperature of 5430 K. This work provides a quick and effective strategy to apply CQDs to WLED.

Keywords: multi-peak emission; solid-state luminescence; white light-emitting diode; yellow carbon quantum dots.

Abstract

Grants and funding