Boosting, probing and switching-off visible light-induced photocurrents in eumelanin-porous silicon hybrids

RSC Advances ◽  
2015 ◽  
Vol 5 (70) ◽  
pp. 56704-56710 ◽  
Author(s):  
Andrea Pinna ◽  
Fabrizio Simbula ◽  
Daniela Marongiu ◽  
Alessandro Pezzella ◽  
Marco d'Ischia ◽  
...  
Keyword(s):  
Solid State ◽  
Porous Silicon ◽  
Visible Light ◽  
Solid State Polymerization

Improved solid state polymerization of eumelanin in porous silicon and new insights into the mechanisms of photoconduction of eumelanin films.

Visible Electroluminescence of Porous Silicon Devices with a Solid State Contact

1991 ◽  
Vol 256 ◽  
Author(s):  
A. Richter ◽  
W. Lang ◽  
P. Steiner ◽  
F. Kozlowski ◽  
H. Sandmaier
Keyword(s):  
Solid State ◽  
Porous Silicon ◽  
Visible Light ◽  
Ultraviolet Light ◽  
Anodic Dissolution ◽  
Porous Layer ◽  
Electrical Current ◽  
Light Emitting ◽  
Silicon Devices

ABSTRACTThe photoluminescence and electroluminescence of light emitting porous silicon (LEPOS) is described. The porous silicon is made by anodic dissolution of silicon in HF with an applied electrical current and illumination with visible light. Photoluminescence is observed using ultraviolet light, visible electroluminescence is achieved by applying a voltage to a solid state contact on top of the porous layer. The luminescence, the structure and the composition of the LEPOS are studied.

Ruthenium(ii) complex-sensitized solid-state polymerization of diacetylene in the visible light region

2008 ◽  
Vol 18 (39) ◽  
pp. 4704 ◽  
Author(s):  
Xian You ◽  
Gang Zou ◽  
Qiang Ye ◽  
Qijin Zhang ◽  
Pingsheng He
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Visible Light Region ◽  
Light Region ◽  
Solid State Polymerization

scholarly journals Fluorinated azobenzenes as supramolecular halogen-bonding building blocks

2019 ◽  
Vol 15 ◽  
pp. 2013-2019 ◽  
Author(s):  
Esther Nieland ◽  
Oliver Weingart ◽  
Bernd M Schmidt
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
Visible Light ◽  
Half Life ◽  
Photophysical Properties ◽  
Bathochromic Shift ◽  
Halogen Bonding ◽  
Building Blocks ◽  
Partial Overlap

ortho-Fluoroazobenzenes are a remarkable example of bistable photoswitches, addressable by visible light. Symmetrical, highly fluorinated azobenzenes bearing an iodine substituent in para-position were shown to be suitable supramolecular building blocks both in solution and in the solid state in combination with neutral halogen bonding acceptors, such as lutidines. Therefore, we investigate the photochemistry of a series of azobenzene photoswitches. Upon introduction of iodoethynyl groups, the halogen bonding donor properties are significantly strengthened in solution. However, the bathochromic shift of the π→π* band leads to a partial overlap with the n→π* band, making it slightly more difficult to address. The introduction of iodine substituents is furthermore accompanied with a diminishing thermal half-life. A series of three azobenzenes with different halogen bonding donor properties are discussed in relation to their changing photophysical properties, rationalized by DFT calculations.

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