The origins of the broadband photoluminescence from carbon nitrides and applications to white light emitting
photoluminescence, carbon nitrides, thermal polycondensation, white light emission
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.
Tsinghua University Press
Zhixing Gan,Yun Shan,Jiarui Chen,Qingfeng Gui,Qizhen Zhang,Shouping Nie,Xinglong Wu, The origins of the broadband photoluminescence from carbon nitrides and applications to white light emitting. NanoRes.2016, 9(6): 1801–1812