Long lifetime pure organic phosphorescence based on water soluble carbon dots.

Carbon dots show potential in lighting and displays. However, only their fluorescence has been observed so far. Here we report the observation of phosphorescence from carbon dots in a polyvinyl alcohol matrix. The phosphorescence is attributed to C=O bonds on the surface of carbon dots and has a very long lifetime (~380 ms).

[1]  A. Monkman,et al.  Room‐Temperature Phosphorescence From Films of Isolated Water‐Soluble Conjugated Polymers in Hydrogen‐Bonded Matrices , 2012 .

[2]  Zhenhui Kang,et al.  Carbon nanodots: synthesis, properties and applications , 2012 .

[3]  Gerard J. Wilson,et al.  Advanced Materials for Banknote Applications , 2001 .

[4]  P. Schmuki,et al.  Nb doped TiO2 nanotubes for enhanced photoelectrochemical water-splitting. , 2011, Nanoscale.

[5]  R. Li,et al.  An electrochemical avenue to blue luminescent nanocrystals from multiwalled carbon nanotubes (MWCNTs). , 2007, Journal of the American Chemical Society.

[6]  Dan Li,et al.  Graphene/Polyaniline Nanocomposite for Hydrogen Sensing , 2010 .

[7]  G. Eda,et al.  Tunable photoluminescence from graphene oxide. , 2012, Angewandte Chemie.

[8]  Ya‐Ping Sun,et al.  Quantum-sized carbon dots for bright and colorful photoluminescence. , 2006, Journal of the American Chemical Society.

[9]  H. Ming,et al.  Large scale electrochemical synthesis of high quality carbon nanodots and their photocatalytic property. , 2012, Dalton transactions.

[10]  Qiang Zhao,et al.  Phosphorescent heavy-metal complexes for bioimaging. , 2011, Chemical Society reviews.

[11]  Chun-Wei Chen,et al.  Blue photoluminescence from chemically derived graphene oxide. , 2010, Advanced materials.

[12]  Sheila N. Baker,et al.  Luminescent carbon nanodots: emergent nanolights. , 2010, Angewandte Chemie.

[13]  Olivier Jacquet,et al.  Cover Picture: A Diagonal Approach to Chemical Recycling of Carbon Dioxide: Organocatalytic Transformation for the Reductive Functionalization of CO2 (Angew. Chem. Int. Ed. 1/2012) , 2012 .

[14]  Jing Yang,et al.  One-step synthesis of fluorescent carbon nanoparticles by laser irradiation , 2009 .

[15]  Quang Trung Tran,et al.  Photoluminescence and Raman studies of graphene thin films prepared by reduction of graphene oxide , 2010 .

[16]  E. Wang,et al.  Easy synthesis and imaging applications of cross-linked green fluorescent hollow carbon nanoparticles. , 2012, ACS nano.

[17]  Siew Yee Wong,et al.  Intrinsically fluorescent carbon dots with tunable emission derived from hydrothermal treatment of glucose in the presence of monopotassium phosphate. , 2011, Chemical communications.

[18]  Jinyoung Jeong,et al.  Color‐Tunable Photoluminescent Fullerene Nanoparticles , 2012, Advanced materials.

[19]  Cai‐Feng Wang,et al.  Facile access to versatile fluorescent carbon dots toward light-emitting diodes. , 2012, Chemical communications.

[20]  Jinglin Liu,et al.  Water-soluble fluorescent carbon quantum dots and photocatalyst design. , 2010, Angewandte Chemie.

[21]  K. Loh,et al.  One-pot synthesis of fluorescent carbon nanoribbons, nanoparticles, and graphene by the exfoliation of graphite in ionic liquids. , 2009, ACS nano.

[22]  R. Friend,et al.  Fluorescence and Phosphorescence in Organic Materials , 2002 .

[23]  Yiman Zhang,et al.  Stacking-induced white-light and blue-light phosphorescence from purely organic radical materials , 2011 .

[24]  Kangwon Lee,et al.  Activating efficient phosphorescence from purely organic materials by crystal design. , 2011, Nature chemistry.

[25]  Minghong Wu,et al.  Observation of pH-, solvent-, spin-, and excitation-dependent blue photoluminescence from carbon nanoparticles. , 2010, Chemical communications.

[26]  Yi Lin,et al.  Electrochemical Tuning of Luminescent Carbon Nanodots: From Preparation to Luminescence Mechanism , 2011, Advanced materials.

[27]  E. Giannelis,et al.  Formation mechanism of carbogenic nanoparticles with dual photoluminescence emission. , 2012, Journal of the American Chemical Society.

[28]  Gaetano Granozzi,et al.  Evolution of Electrical, Chemical, and Structural Properties of Transparent and Conducting Chemically Derived Graphene Thin Films , 2009 .

[29]  Guangxia Shen,et al.  Light‐Triggered Theranostics Based on Photosensitizer‐Conjugated Carbon Dots for Simultaneous Enhanced‐Fluorescence Imaging and Photodynamic Therapy , 2012, Advanced materials.

[30]  Yang Tian,et al.  Carbon Dot‐Based Inorganic–Organic Nanosystem for Two‐Photon Imaging and Biosensing of pH Variation in Living Cells and Tissues , 2012, Advanced materials.

[31]  Camille Petit,et al.  Revisiting the chemistry of graphite oxides and its effect on ammonia adsorption , 2009 .

[32]  Sourav Bag,et al.  Synthesis, functionalization and bioimaging applications of highly fluorescent carbon nanoparticles. , 2011, Nanoscale.

[33]  Agnès Rivaton,et al.  Photochemical behavior of PVA as an oxygen-barrier polymer for solar cell encapsulation , 2011 .

[34]  B. Tang,et al.  Crystallization-Induced Phosphorescence of Pure Organic Luminogens at Room Temperature , 2010 .