Oligomer Electrolytes for Light-Emitting Electrochemical Cells: Influence of the End Groups on Ion Coordination, Ion Binding, and Turn-on Kinetics

2019 ◽  
Vol 11 (43) ◽  
pp. 40372-40381 ◽  
Author(s):  
Isabelle Gerz ◽  
E. Mattias Lindh ◽  
Pall Thordarson ◽  
Ludvig Edman ◽  
Jolla Kullgren ◽  
...  
Keyword(s):  
Ion Binding ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Turn On ◽  
End Groups

Polymer Light-Emitting Electrochemical Cells: Doping Concentration, Emission-Zone Position, and Turn-On Time

2007 ◽  
Vol 17 (11) ◽  
pp. 1807-1813 ◽  
Author(s):  
J.-H. Shin ◽  
N. D. Robinson ◽  
S. Xiao ◽  
L. Edman
Keyword(s):  
Doping Concentration ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Turn On

LECs Made of m-Lppp

1997 ◽  
Vol 488 ◽  
Author(s):  
F. P. Wenzl ◽  
S. Tasch ◽  
J. Gao ◽  
L. Holzer ◽  
U. Scherf ◽  
...  
Keyword(s):  
Blue Light ◽  
Active Layer ◽  
Conjugated Polymer ◽  
Response Times ◽  
Conductive Polymer ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Turn On ◽  
Ionic Salt ◽  
Time Of Operation

AbstractWe report the application of the blue light emitting conjugated polymer m-LPPP (methyl substituted laddertype poly(paraphenylene) ) in light emitting electrochemical cells. The active layer of the LEC consists of a blend of m-LPPP with the ionically conductive polymer PEO and LiCF3SO3 as ionic salt. Investigations of different concentrations of PEO and salt showed that the best LECs made of m-LPPP up to now where realised with an active layer consisting of a blend of m-LPPP:PEO:salt in the range of 20:10:3. In this case we are able to realise LECs with response times in the range of 30 μs. The I/U characteristics show low turn on voltages both for current and electroluminescence, but only in the case of ITO biased as a cathode. The initial electroluminescence spectra are quite the same as those for LEDs made of m-LPPP but turn into green after some time of operation.

Improved Turn-On Times of Light-Emitting Electrochemical Cells

2008 ◽  
Vol 20 (2) ◽  
pp. 388-396 ◽  
Author(s):  
Eli Zysman-Colman ◽  
Jason D. Slinker ◽  
Jeffrey B. Parker ◽  
George G. Malliaras ◽  
Stefan Bernhard
Keyword(s):  
Electrochemical Cells ◽  
Light Emitting ◽  
Turn On

Temperature Effect of Ionic Transition Metal Complex Light-Emitting Electrochemical Cells

2013 ◽  
Vol 1567 ◽  
Author(s):  
Takeo Akatsuka ◽  
Stephan van Reenen ◽  
Enrico Bandiello ◽  
Henk J. Bolink
Keyword(s):  
Transition Metal Complex ◽  
Ionic Transport ◽  
Quantum Yields ◽  
Electronic Conduction ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Operational Mechanism ◽  
Turn On ◽  
Ionic Transition ◽  
Increasing Temperature

ABSTRACTLight-Emitting Electrochemical Cells (LECs) consist of solution processable ionic light-emitting materials and use air stable electrodes. Their operational mechanism relies on both ionic and electronic conduction. The dynamic behavior is primarily determined by the ionic conductivity. Here, we demonstrate that with increasing temperature the LECs turn-on faster yet without decreasing the efficiency. This is due to the activation energy of ionic transport and the temperature independent photoluminescence quantum yields.

scholarly journals Suppression of Electric Field-Induced Segregation in Sky-Blue Perovskite Light-Emitting Electrochemical Cells

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1937
Author(s):  
Tatiana G. Liashenko ◽  
Anatoly P. Pushkarev ◽  
Arnas Naujokaitis ◽  
Vidas Pakštas ◽  
Marius Franckevičius ◽  
...  
Keyword(s):  
Electric Field ◽  
Band Gap ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
Film Deposition ◽  
Infrared Light ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Turn On

Inexpensive perovskite light-emitting devices fabricated by a simple wet chemical approach have recently demonstrated very prospective characteristics such as narrowband emission, low turn-on bias, high brightness, and high external quantum efficiency of electroluminescence, and have presented a good alternative to well-established technology of epitaxially grown III-V semiconducting alloys. Engineering of highly efficient perovskite light-emitting devices emitting green, red, and near-infrared light has been demonstrated in numerous reports and has faced no major fundamental limitations. On the contrary, the devices emitting blue light, in particular, based on 3D mixed-halide perovskites, suffer from electric field-induced phase separation (segregation). This crystal lattice defect-mediated phenomenon results in an undesirable color change of electroluminescence. Here we report a novel approach towards the suppression of the segregation in single-layer perovskite light-emitting electrochemical cells. Co-crystallization of direct band gap CsPb(Cl,Br)3 and indirect band gap Cs4Pb(Cl,Br)6 phases in the presence of poly(ethylene oxide) during a thin film deposition affords passivation of surface defect states and an increase in the density of photoexcited charge carriers in CsPb(Cl,Br)3 grains. Furthermore, the hexahalide phase prevents the dissociation of the emissive grains in the strong electric field during the device operation. Entirely resistant to 5.7 × 106 V·m−1 electric field-driven segregation light-emitting electrochemical cell exhibits stable emission at wavelength 479 nm with maximum external quantum efficiency 0.7%, maximum brightness 47 cd·m−2, and turn-on bias of 2.5 V.

scholarly journals Luminescent copper(i) complexes with bisphosphane and halogen-substituted 2,2′-bipyridine ligands

2018 ◽  
Vol 47 (40) ◽  
pp. 14263-14276 ◽  
Author(s):  
Sarah Keller ◽  
Alessandro Prescimone ◽  
Henk Bolink ◽  
Michele Sessolo ◽  
Giulia Longo ◽  
...  
Keyword(s):  
Electrochemical Cells ◽  
Light Emitting ◽  
Turn On

Light-emitting electrochemical cells with Cu(i) emitters with halo-substituted 2,2′-bipyridine ligands display orange electroluminescence and short turn-on times.

Improving the Turn-On Time of Light-Emitting Electrochemical Cells without Sacrificing their Stability

2010 ◽  
Vol 22 (4) ◽  
pp. 1288-1290 ◽  
Author(s):  
Rubén D. Costa ◽  
Antonio Pertegás ◽  
Enrique Ortí ◽  
Henk J. Bolink
Keyword(s):  
Electrochemical Cells ◽  
Light Emitting ◽  
Turn On

Turn on behavior of light emitting electrochemical cells

1999 ◽  
Vol 102 (1-3) ◽  
pp. 1138-1139 ◽  
Author(s):  
F.P. Wenzl ◽  
L. Holzer ◽  
S. Tasch ◽  
U. Scherf ◽  
K. Müllen ◽  
...  
Keyword(s):  
Electrochemical Cells ◽  
Light Emitting ◽  
Turn On

Single Molecule Solid State Light Emitting Electrochemical Cells with Lifetimes Superior to 3000 Hours

2008 ◽  
Author(s):  
Henk Bolink ◽  
Rubén D. Costa ◽  
Enrique Orti ◽  
Michele Sessolo ◽  
Stefan Graber ◽  
...  
Keyword(s):  
Solid State ◽  
Single Molecule ◽  
Electrochemical Cells ◽  
Light Emitting
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