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Title: Excitonic photoluminescence from nanodisc states in graphene oxides
Authors: Kozawa, Daichi
Zhu, Xi
Miyauchi, Yuhei
Mouri, Shinichiro
Ichida, Masao
Su, Haibin
Matsuda, Kazunari
Keywords: DRNTU::Engineering::Materials::Photonics and optoelectronics materials
Issue Date: 2014
Source: Kozawa, D., Zhu, X., Miyauchi, Y., Mouri, S., Ichida, M., Su, H., et al. (2014). Excitonic photoluminescence from nanodisc states in graphene oxides. The journal of physical chemistry letters, 5(10), 1754-1759.
Series/Report no.: The journal of physical chemistry letters
Abstract: The origin of near-infrared (NIR) luminescence from graphene oxide (GO) is investigated by photoluminescence (PL) excitation spectroscopy, time-resolved PL spectroscopy, and density functional theory based many body perturbation theories. The energy of experimentally observed NIR PL peak depends on the excitation energy, and the peak broadens with increasing excitation energy. It is found that the PL decay curves in time-resolved spectroscopy show build-up behavior at lower emission energies due to energy transfer between smaller to larger graphene nanodisc (GND) states embedded in GO. We demonstrate that the NIR PL originates from ensemble emission of GND states with a few nanometers in size. The theoretical calculations reveal the electronic and excitonic properties of individual GND states with various sizes, which accounts for the inhomogeneously broadened NIR PL. We further demonstrate that the electronic properties are highly sensitive to the protonation and deprotonation processes of GND states using both the experimental and theoretical approaches.
ISSN: 1948-7185
DOI: 10.1021/jz500516u
Rights: © 2014 American Chemical Society.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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