Synthesis of graphene oxide dots for excitation-wavelength independent photoluminescence at high quantum yields

Chiao Yi Teng, Te Fu Yeh, Kuang I. Lin, Shean Jen Chen, Masahiro Yoshimura, Hsisheng Teng

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This study reports on the synthesis of graphene oxide dots (GODs, 2.5 ± 0.5 nm) exhibiting excitation-wavelength independent photoluminescence (PL) at 530 nm. The GODs, which are of high uniformity and crystallinity, are produced by mildly oxidizing thermally-reduced GO sheets under sonication. The GOD aqueous suspension yields a maximal PL quantum yield (QY) of 16% under excitation at 470 nm. This PL can be ascribed to the irradiative excitation of electrons from the non-bonding oxygen (n) states to the graphene anti-bonding π orbital with subsequent relaxation of the electrons to the n ground states. Nitrogen-doping reduces vacancy defects and donates electrons to compensate for the unbalanced charge in p-type GODs, thereby increasing the PL QY to 22% for the nitrogen-doped GODs (NGODs). Treating the unadorned GODs and NGODs with submerged liquid plasma in tetrahydrofuran suppresses charge leakage from the carbonyl groups on the graphene periphery and increases the QYs to 42% and 50%, respectively. The GODs could be used as phosphors for the generation of white light by combining green emissions (530 nm) with violet light used for excitation. The present study demonstrates facile synthesis of high-quality green-emitting GODs and an effective method for the repair of vacancy defects and the stabilization of oxygen functionalities to enhance PL emission from GODs.

Original languageEnglish
Pages (from-to)4553-4562
Number of pages10
JournalJournal of Materials Chemistry C
Volume3
Issue number17
DOIs
Publication statusPublished - 2015 May 7

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Quantum yield
Oxides
Graphene
Photoluminescence
Wavelength
Nitrogen
Vacancies
Electrons
Oxygen
Defects
Sonication
Leakage (fluid)
Phosphors
Ground state
Suspensions
Repair
Stabilization
Doping (additives)
Plasmas

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

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title = "Synthesis of graphene oxide dots for excitation-wavelength independent photoluminescence at high quantum yields",
abstract = "This study reports on the synthesis of graphene oxide dots (GODs, 2.5 ± 0.5 nm) exhibiting excitation-wavelength independent photoluminescence (PL) at 530 nm. The GODs, which are of high uniformity and crystallinity, are produced by mildly oxidizing thermally-reduced GO sheets under sonication. The GOD aqueous suspension yields a maximal PL quantum yield (QY) of 16{\%} under excitation at 470 nm. This PL can be ascribed to the irradiative excitation of electrons from the non-bonding oxygen (n) states to the graphene anti-bonding π orbital with subsequent relaxation of the electrons to the n ground states. Nitrogen-doping reduces vacancy defects and donates electrons to compensate for the unbalanced charge in p-type GODs, thereby increasing the PL QY to 22{\%} for the nitrogen-doped GODs (NGODs). Treating the unadorned GODs and NGODs with submerged liquid plasma in tetrahydrofuran suppresses charge leakage from the carbonyl groups on the graphene periphery and increases the QYs to 42{\%} and 50{\%}, respectively. The GODs could be used as phosphors for the generation of white light by combining green emissions (530 nm) with violet light used for excitation. The present study demonstrates facile synthesis of high-quality green-emitting GODs and an effective method for the repair of vacancy defects and the stabilization of oxygen functionalities to enhance PL emission from GODs.",
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Synthesis of graphene oxide dots for excitation-wavelength independent photoluminescence at high quantum yields. / Teng, Chiao Yi; Yeh, Te Fu; Lin, Kuang I.; Chen, Shean Jen; Yoshimura, Masahiro; Teng, Hsisheng.

In: Journal of Materials Chemistry C, Vol. 3, No. 17, 07.05.2015, p. 4553-4562.

Research output: Contribution to journalArticle

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T1 - Synthesis of graphene oxide dots for excitation-wavelength independent photoluminescence at high quantum yields

AU - Teng, Chiao Yi

AU - Yeh, Te Fu

AU - Lin, Kuang I.

AU - Chen, Shean Jen

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AU - Teng, Hsisheng

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