Time-resolved properties of ferroelectric electron emission from [Pb(Mg1/3Nb2/3)O3]0.71[PbTiO3]0.29 single crystals

2012 ◽  
Vol 112 (3) ◽  
pp. 034101
Author(s):  
J. Becherer ◽  
O. Mieth ◽  
L. M. Eng
Keyword(s):  
Single Crystals ◽  
Electron Emission ◽  
Time Resolved

Surface processes on KBr single crystals examined by thermostimulated exo-electron emission and desorption

2021 ◽  
Vol 114 ◽  
pp. 110898
Author(s):  
P. Pokorny ◽  
M. Novotny ◽  
Y. Dekhtyar ◽  
A. Lushchik ◽  
P. Hruska ◽  
...  
Keyword(s):  
Single Crystals ◽  
Electron Emission ◽  
Surface Processes

Bulk and surface processes in KBr single crystals examined by thermostimulated luminescence and exo-electron emission

2021 ◽  
Vol 117 ◽  
pp. 111191
Author(s):  
P. Pokorny ◽  
M. Novotny ◽  
J. Fara ◽  
Y. Dekhtyar ◽  
A. Lushchik ◽  
...  
Keyword(s):  
Single Crystals ◽  
Electron Emission ◽  
Surface Processes ◽  
Thermostimulated Luminescence

scholarly journals Synthesis and Photobehavior of a NewDehydrobenzoannulene-Based HOF with Fluorine Atoms: From Solution to Single Crystals Observation

2021 ◽  
Vol 22 (9) ◽  
pp. 4803
Author(s):  
Eduardo Gomez ◽  
Ichiro Hisaki ◽  
Abderrazzak Douhal
Keyword(s):  
Charge Transfer ◽  
Single Crystals ◽  
Parent Compound ◽  
Time Resolved ◽  
Strong Basis ◽  
Triplet Structure ◽  
Carboxylic Groups ◽  
Potential Applications ◽  
A Charge ◽  
Further Development

Hydrogen-bonded organic frameworks (HOFs) are the focus of intense scientific research due their potential applications in science and technology. Here, we report on the synthesis, characterization, and photobehavior of a new HOF (T12F-1(124TCB)) based on a dehydrobenzoannulene derivative containing fluorine atoms (T12F-COOH). This HOF exhibits a 2D porous sheet, which is hexagonally networked via H-bonds between the carboxylic groups, and has an interlayers distance (4.3 Å) that is longer than that of a typical π–π interaction. The presence of the fluorine atoms in the DBA molecular units largely increases the emission quantum yield in DMF (0.33, T12F-COOH) when compared to the parent compound (0.02, T12-COOH). The time-resolved dynamics of T12F-COOH in DMF is governed by the emission from a locally excited state (S1, ~ 0.4 ns), a charge-transfer state (S1(CT), ~ 2 ns), and a room temperature emissive triplet state (T1, ~ 20 ns), in addition to a non-emissive triplet structure with a charge-transfer character (T1(CT), τ = 0.75 µs). We also report on the results using T12F-ester. Interestingly, FLIM experiments on single crystals unravel that the emission lifetimes of the crystalline HOF are almost twice those of the amorphous ones or the solid T12F-ester sample. This shows the relevance of the H-bonds in the photodynamics of the HOF and provides a strong basis for further development and study of HOFs based on DBAs for potential applications in photonics.

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