Comment on ‘‘Origin of the Stokes shift: A geometrical model of exciton spectra in 2D semiconductors’’

1993 ◽  
Vol 71 (8) ◽  
pp. 1286-1286 ◽  
Author(s):  
J. A. Kash
Keyword(s):  
Stokes Shift ◽  
Geometrical Model ◽  
2D Semiconductors

Origin of the Stokes Shift: A Geometrical Model of Exciton Spectra in 2D Semiconductors

1994 ◽  
Vol 72 (12) ◽  
pp. 1945-1945 ◽  
Author(s):  
Fang Yang ◽  
M. Wilkinson ◽  
E. J. Austin ◽  
K. P. O'Donnell
Keyword(s):  
Stokes Shift ◽  
Geometrical Model ◽  
2D Semiconductors

Origin of the Stokes shift: A geometrical model of exciton spectra in 2D semiconductors

1993 ◽  
Vol 70 (3) ◽  
pp. 323-326 ◽  
Author(s):  
Fang Yang ◽  
M. Wilkinson ◽  
E. J. Austin ◽  
K. P. O’Donnell
Keyword(s):  
Stokes Shift ◽  
Geometrical Model ◽  
2D Semiconductors

Strain tuning of the Stokes shift in atomically thin semiconductors

Nanoscale ◽  
2020 ◽  
Vol 12 (40) ◽  
pp. 20786-20796
Author(s):  
Iris Niehues ◽  
Philipp Marauhn ◽  
Thorsten Deilmann ◽  
Daniel Wigger ◽  
Robert Schmidt ◽  
...  
Keyword(s):  
Mechanical Strain ◽  
Stokes Shift ◽  
2D Semiconductors ◽  
Excitonic Transitions

We measure the Stokes shift of excitonic transitions in 2D semiconductors and tune it by mechanical strain.

Intrinsic doping limit and defect-assisted luminescence in Cs4PbBr6

2019 ◽  
Author(s):  
Young-Kwang Jung ◽  
Joaquin Calbo ◽  
Ji-Sang Park ◽  
Lucy D. Wahlley ◽  
Sunghyun Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Stokes Shift ◽  
Green Luminescence ◽  
Counter Ions ◽  
Self Consistent ◽  
Deep Ultraviolet ◽  
Halide Perovskite ◽  
Related Compounds ◽  
Level Analysis

Cs<sub>4</sub>PbBr<sub>6 </sub>is a member of the halide perovskite family that is built from isolated (zero-dimensional) PbBr<sub>6</sub><sup>4-</sup> octahedra with Cs<sup>+</sup> counter ions. The material exhibits anomalous optoelectronic properties: optical absorption and weak emission in the deep ultraviolet (310 - 375 nm) with efficient luminescence in the green region (~ 540 nm). Several hypotheses have been proposed to explain the giant Stokes shift including: (i) phase impurities; (ii) self-trapped exciton; (iii) defect emission. We explore, using first-principles theory and self-consistent Fermi level analysis, the unusual defect chemistry and physics of Cs<sub>4</sub>PbBr<sub>6</sub>. We find a heavily compensated system where the room-temperature carrier concentrations (< 10<sup>9</sup> cm<sup>-3</sup>) are more than one million times lower than the defect concentrations. We show that the low-energy Br-on-Cs antisite results in the formation of a polybromide (Br<sub>3</sub>) species that can exist in a range of charge states. We further demonstrate from excited-state calculations that tribromide moieties are photoresponsive and can contribute to the observed green luminescence. Photoactivity of polyhalide molecules is expected to be present in other halide perovskite-related compounds where they can influence light absorption and emission. <br>

Intrinsic doping limit and defect-assisted luminescence in Cs4PbBr6

2019 ◽  
Author(s):  
Young-Kwang Jung ◽  
Joaquin Calbo ◽  
Ji-Sang Park ◽  
Lucy D. Wahlley ◽  
Sunghyun Kim ◽  
...  
Keyword(s):  
First Principles ◽  
Room Temperature ◽  
Stokes Shift ◽  
Green Luminescence ◽  
Counter Ions ◽  
Self Consistent ◽  
Deep Ultraviolet ◽  
Halide Perovskite ◽  
Related Compounds ◽  
Level Analysis

Cs<sub>4</sub>PbBr<sub>6 </sub>is a member of the halide perovskite family that is built from isolated (zero-dimensional) PbBr<sub>6</sub><sup>4-</sup> octahedra with Cs<sup>+</sup> counter ions. The material exhibits anomalous optoelectronic properties: optical absorption and weak emission in the deep ultraviolet (310 - 375 nm) with efficient luminescence in the green region (~ 540 nm). Several hypotheses have been proposed to explain the giant Stokes shift including: (i) phase impurities; (ii) self-trapped exciton; (iii) defect emission. We explore, using first-principles theory and self-consistent Fermi level analysis, the unusual defect chemistry and physics of Cs<sub>4</sub>PbBr<sub>6</sub>. We find a heavily compensated system where the room-temperature carrier concentrations (< 10<sup>9</sup> cm<sup>-3</sup>) are more than one million times lower than the defect concentrations. We show that the low-energy Br-on-Cs antisite results in the formation of a polybromide (Br<sub>3</sub>) species that can exist in a range of charge states. We further demonstrate from excited-state calculations that tribromide moieties are photoresponsive and can contribute to the observed green luminescence. Photoactivity of polyhalide molecules is expected to be present in other halide perovskite-related compounds where they can influence light absorption and emission. <br>

Enhanced Multiplexing of Immunofluorescence Microscopy Using a Long‐Stokes‐Shift Fluorophore

2021 ◽  
Vol 1 (8) ◽  
Author(s):  
Sydney J. Reitz ◽  
Andrew D. Sauerbeck ◽  
Terrance T. Kummer
Keyword(s):  
Immunofluorescence Microscopy ◽  
Stokes Shift

A phenanthrene[9,10-d]imidazole-phenol-based fluorescent probe combined ESIPT and AIE for “turn-on” detection of Cu2+ with a green-emitting and improved stokes shift and its application

2021 ◽  
Author(s):  
Jiahui Du ◽  
Bing Zhao ◽  
Wei Kan ◽  
Haochun Yin ◽  
Tianshu Song ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
Stokes Shift ◽  
Fluorescent Sensors ◽  
Turn On ◽  
Highly Sensitive

Development of highly sensitive and selective fluorescent sensors toward Cu2+ has gained considerable attention in view of its application of environmental and biological fields. However, the strategy of sensing by...

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