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Nano Research

Article Title

The origins of the broadband photoluminescence from carbon nitrides and applications to white light emitting

Authors

Zhixing Gan, Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physical Science and Technology, Nanjing NormalUniversity, Nanjing 210023, China Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Yun Shan, Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China School of Environmental Science, Nanjing Xiaozhuang University, Nanjing 211171, China
Jiarui Chen, Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Qingfeng Gui, Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Qizhen Zhang, Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
Shouping Nie, Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physical Science and Technology, Nanjing NormalUniversity, Nanjing 210023, China
Xinglong Wu, Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China

Keywords

photoluminescence, carbon nitrides, thermal polycondensation, white light emission

Abstract

Carbon nitrides synthesized by thermal polycondensation of melamine at 700 °Cexhibit photoluminescence (PL) ranging from 400 to 650 nm. This broad PL isattributed to band to band transitions and bandtail transitions of lone pair (LP)states of intra-tri-s-triazine and inter-tri-s-triazine nitrogens. The proposed PLmechanism is further confirmed by diffusion reflectance spectroscopy, as wellas time-resolved and temperature-dependent PL. This intense fluorescenceis stable at different pH and resistant to UV exposure, suggesting that thisinexpensive broadband luminescent material could be significant for whitelight-emitting (WLE) applications. Thus, quasi-WLE films and membranes withdesigned patterns are fabricated by embedding the carbon nitrides into polymethylmethacrylate. Moreover, even broader PL (400 to 740 nm) is acquired in compositefilms composed of carbon nitrides, further suggesting that the carbonnitrides are robust candidates for WLE.

Graphical Abstract

Publisher

Tsinghua University Press

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