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.

Universal Transients in Polymer and Ionic Transition Metal Complex Light-Emitting Electrochemical Cells

2013 ◽  
Vol 135 (2) ◽  
pp. 886-891 ◽  
Author(s):  
Stephan van Reenen ◽  
Takeo Akatsuka ◽  
Daniel Tordera ◽  
Martijn Kemerink ◽  
Henk J. Bolink
Keyword(s):  
Transition Metal ◽  
Metal Complex ◽  
Transition Metal Complex ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Ionic Transition

Dynamic Doping in Planar Ionic Transition Metal Complex-Based Light-Emitting Electrochemical Cells

2013 ◽  
Vol 23 (28) ◽  
pp. 3531-3538 ◽  
Author(s):  
Sebastian B. Meier ◽  
Stephan van Reenen ◽  
Bastien Lefevre ◽  
David Hartmann ◽  
Henk J. Bolink ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complex ◽  
Transition Metal Complex ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Ionic Transition

Green-yellow emitting hybrid light emitting electrochemical cell

2017 ◽  
Vol 5 (46) ◽  
pp. 12062-12068 ◽  
Author(s):  
M. Di Marcantonio ◽  
J. E. Namanga ◽  
V. Smetana ◽  
N. Gerlitzki ◽  
F. Vollkommer ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complex ◽  
Transition Metal Complex ◽  
Electrochemical Cell ◽  
Electrochemical Cells ◽  
Device Structure ◽  
Light Emitting ◽  
Ionic Transition ◽  
Zno Nanocrystal

Greenish light-emitting electrochemical cells (LECs) reaching a lifetime of 271 hours at luminance of 1500 cd m−2 were realized by the introduction of a fluorinated ionic transition metal complex (iTMC) inside the ZnO nanocrystal hybrid-LEC device structure.

scholarly journals The dynamic behavior of thin-film ionic transition metal complex-based light-emitting electrochemical cells

2014 ◽  
Vol 116 (10) ◽  
pp. 104504 ◽  
Author(s):  
Sebastian B. Meier ◽  
David Hartmann ◽  
Albrecht Winnacker ◽  
Wiebke Sarfert
Keyword(s):  
Thin Film ◽  
Transition Metal ◽  
Metal Complex ◽  
Dynamic Behavior ◽  
Transition Metal Complex ◽  
Electrochemical Cells ◽  
Light Emitting ◽  
Ionic Transition

Recent advances in light-emitting electrochemical cells

2011 ◽  
Vol 83 (12) ◽  
pp. 2115-2128 ◽  
Author(s):  
Rubén D. Costa ◽  
Enrique Ortí ◽  
Henk J. Bolink
Keyword(s):  
Thin Film ◽  
Transition Metal Complexes ◽  
Short Review ◽  
Electrochemical Cells ◽  
Luminescent Material ◽  
Chemical Modifications ◽  
Electroluminescent Devices ◽  
Light Emitting ◽  
Ionic Transition ◽  
Scientific Fields

Light-emitting electrochemical cells (LECs) are solution-processable thin-film electroluminescent devices consisting of a luminescent material in an ionic environment. The simplest type of LEC is based on only one material, ionic transition-metal complexes (iTMCs). These materials are of interest for different scientific fields such as chemistry, physics, and technology as selected chemical modifications of iTMCs resulted in crucial breakthroughs for the performance of LECs. This short review highlights the different strategies used to design these compounds with the aim to enhance the performances of LECs.

Degradation in iTMC OLEDs

2007 ◽  
Vol 1029 ◽  
Author(s):  
Leonard J. Soltzberg ◽  
Velda Goldberg ◽  
Michael D. Kaplan ◽  
Heather Bankowski ◽  
Shannon Browne ◽  
...  
Keyword(s):  
Transition Metal Complex ◽  
Light Emission ◽  
Local Heating ◽  
Degradation Process ◽  
Metal Electrode ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Ionic Transition ◽  
Device Operation

AbstractThe processes underlying degradation of organic light emitting diodes (OLEDs) are gradually becoming understood. In ruthenium-based ionic transition metal complex (iTMC) OLEDs, a dimeric species forms during device operation that quenches light emission [1]. Water has been implicated in this degradation process [2]. We report recent studies on degradation of OLEDs fabricated with Ir(ppy)2(dtb-bpy)PF6 [ppy = 2-phenylpyridine, dtb-bpy = 4,4'-di-tert-butyl 2,2'-bipyridine [3]. We have found that applying a thicker-than-usual metal electrode results in shorter turn-on times and higher light emission, though little improvement in lifetime. It appears that the degradation of these devices occurs by a different mechanism from that of the ruthenium-based devices and may involve local heating leading to chemical decomposition of the organic material.Observation of recurring but often transient dark-colored substances in both the Ru(bpy)3(PF6)2 and Ir(ppy)2(dtb-bpy)PF6 systems, seen both in the solid state and in solution samples, may also be indicative of decomposition.

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