Ultra-bright alkylated graphene quantum dots

Nanoscale ◽  
2014 ◽  
Vol 6 (21) ◽  
pp. 12635-12643 ◽  
Author(s):  
Lan Feng ◽  
Xing-Yan Tang ◽  
Yun-Xin Zhong ◽  
Yue-Wen Liu ◽  
Xue-Huan Song ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots

Alkylated graphene quantum dots with negligible oxygen-containing groups exhibit pH-independent and ultra-bright PL with a quantum yield of up to 65%.

A reformative oxidation strategy using high concentration nitric acid for enhancing the emission performance of graphene quantum dots

RSC Advances ◽  
2014 ◽  
Vol 4 (89) ◽  
pp. 47977-47981 ◽  
Author(s):  
Taili Shao ◽  
Guodong Wang ◽  
Xuting An ◽  
Shujuan Zhuo ◽  
Yunsheng Xia ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitric Acid ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
High Concentration ◽  
Emission Performance

Red fluorescent graphene quantum dots with 18% quantum yield at 600 nm were obtained through a concentrated HNO3oxidation strategy.

Sustainable synthesis of single crystalline sulphur-doped graphene quantum dots for bioimaging and beyond

2018 ◽  
Vol 20 (18) ◽  
pp. 4245-4259 ◽  
Author(s):  
Sujata Sangam ◽  
Apoorv Gupta ◽  
Adeeba Shakeel ◽  
Rohan Bhattacharya ◽  
Arun Kumar Sharma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route ◽  
Single Crystalline ◽  
Doped Graphene

Waste-driven single crystalline sulphur-doped GQDs are synthesized via a green hydrothermal route with the highest quantum yield and excellent biocompatibility for bioimaging.

scholarly journals Radiative Rate Modulation Reveals Near‐Unity Quantum Yield of Graphene Quantum Dots (Advanced Optical Materials 19/2021)

2021 ◽  
Vol 9 (19) ◽  
pp. 2170074
Author(s):  
Subhabrata Ghosh ◽  
Nazar Oleksiievets ◽  
Jörg Enderlein ◽  
Alexey I. Chizhik
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Optical Materials ◽  
Graphene Quantum Dots ◽  
Rate Modulation ◽  
Radiative Rate

Triphenylphosphine modified graphene quantum dots: spectral modulation for full spectrum of visible light with high quantum yield

RSC Advances ◽  
2015 ◽  
Vol 5 (42) ◽  
pp. 33347-33350 ◽  
Author(s):  
Siwei Yang ◽  
Chong Zhu ◽  
Jing Sun ◽  
Peng He ◽  
Ningyi Yuan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Visible Light ◽  
Graphene Quantum Dots ◽  
High Quantum Yield ◽  
Full Spectrum ◽  
Spectral Modulation ◽  
High Quantum ◽  
Modified Graphene

The spectral modulation for visible light with high quantum yield is developed based on triphenylphosphine modified graphene quantum dots.

High-yield synthesis of graphene quantum dots with strong green photoluminescence

RSC Advances ◽  
2014 ◽  
Vol 4 (91) ◽  
pp. 50141-50144 ◽  
Author(s):  
J. Gu ◽  
M. J. Hu ◽  
Q. Q. Guo ◽  
Z. F. Ding ◽  
X. L. Sun ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
High Yield ◽  
Photoluminescence Emission ◽  
Emission Performance ◽  
Fluorescent Quantum Yield ◽  
Green Photoluminescence

The obtained GQDs have high fluorescent quantum yield (FL QY = 44.3%) and excitation-independent photoluminescence emission performance.

scholarly journals Radiative Rate Modulation Reveals Near‐Unity Quantum Yield of Graphene Quantum Dots

2021 ◽  
pp. 2100314
Author(s):  
Subhabrata Ghosh ◽  
Nazar Oleksiievets ◽  
Jörg Enderlein ◽  
Alexey I. Chizhik
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Rate Modulation ◽  
Radiative Rate

scholarly journals Quantum Yield Enhancement in Graphene Quantum Dots via Esterification with Benzyl Alcohol

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Suzuka Tachi ◽  
Hiroki Morita ◽  
Misaki Takahashi ◽  
Yusuke Okabayashi ◽  
Takuya Hosokai ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Benzyl Alcohol ◽  
Functional Groups ◽  
Photophysical Properties ◽  
Graphene Quantum Dots ◽  
Yield Enhancement ◽  
Light Illumination ◽  
Nonradiative Recombination ◽  
Widespread Application

Abstract The quantum yield of graphene quantum dots was enhanced by restriction of the rotation and vibration of surface functional groups on the edges of the graphene quantum dots via esterification with benzyl alcohol; this enhancement is crucial for the widespread application of graphene quantum dots in light-harvesting devices and optoelectronics. The obtained graphene quantum dots with highly graphene-stacked structures are understood to participate in π–π interactions with adjacent aromatic rings of the benzylic ester on the edges of the graphene quantum dots, thus impeding the nonradiative recombination process in graphene quantum dots. Furthermore, the crude graphene quantum dots were in a gel-like solid form and showed white luminescence under blue light illumination. Our results show the potential for improving the photophysical properties of nanomaterials, such as the quantum yield and band-gap energy for emission, by controlling the functional groups on the surface of graphene quantum dots through an organic modification approach.

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