Ion gel-based flexible electrochemiluminescence full-color display with improved sky-blue emission using a mixed-metal chelate system

Do Kyun Kwon, Jae Min Myoung

Research output: Contribution to journalArticle

Abstract

Electrochemiluminescence (ECL) materials using redox reactions are attracting attention owing to their remarkable advantages, such as simple structure and use of electrodes without work function limitations. In addition, ECL materials are strong in moisture and air atmosphere and independent of thickness, which is advantageous for low cost printing processes. However, in order to implement next-generation displays, it is necessary to improve the blue (B) emission characteristics and simultaneously realize emission of the three primary colors of red (R), green (G), and B. In this study, ion gel-based flexible ECL display incorporating R, G, and sky-blue (SB) emissions have been successfully demonstrated. The ECL display was implemented using [Ru(bpy)3](PF6)2, [Ir(Fppy)2(dmb)]PF6, and [Ir(Fppy)2(Mepic)] corresponding to R, G, and B emissions, respectively. In particular, to achieve improved B ECL displays, the blended blue (BB) ECL display was designed using a mixed-metal chelate system with mixing of G and B luminophores. The luminance increased by more than 8 times at 5.0 AC peak-to-peak voltages (VPP) and the operating voltage decreased considerably for this BB ECL display compared to the B ECL display. The optimized R, G, and BB ECL displays showed stable emission with luminance of 63.2, 78.6, and 30.6 cd/m2, respectively, at 5.0 VPP. In addition, the flexible ECL displays exhibited stable emission properties even after 5,000 cycles of repetitive mechanical bending tests at a bending radius of 10 mm. These results demonstrate that ECL displays with a simple structure and fabrication process can be considered as a future alternative to conventional flexible displays.

Original languageEnglish
Article number122347
JournalChemical Engineering Journal
Volume379
DOIs
Publication statusPublished - 2020 Jan 1

Fingerprint

chelate
Gels
gel
Metals
Display devices
Ions
Color
Flexible displays
ion
metal
Luminance
Redox reactions
Bending tests
Electric potential
electrode
Printing
moisture
Moisture
atmosphere
Fabrication

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

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title = "Ion gel-based flexible electrochemiluminescence full-color display with improved sky-blue emission using a mixed-metal chelate system",
abstract = "Electrochemiluminescence (ECL) materials using redox reactions are attracting attention owing to their remarkable advantages, such as simple structure and use of electrodes without work function limitations. In addition, ECL materials are strong in moisture and air atmosphere and independent of thickness, which is advantageous for low cost printing processes. However, in order to implement next-generation displays, it is necessary to improve the blue (B) emission characteristics and simultaneously realize emission of the three primary colors of red (R), green (G), and B. In this study, ion gel-based flexible ECL display incorporating R, G, and sky-blue (SB) emissions have been successfully demonstrated. The ECL display was implemented using [Ru(bpy)3](PF6)2, [Ir(Fppy)2(dmb)]PF6, and [Ir(Fppy)2(Mepic)] corresponding to R, G, and B emissions, respectively. In particular, to achieve improved B ECL displays, the blended blue (BB) ECL display was designed using a mixed-metal chelate system with mixing of G and B luminophores. The luminance increased by more than 8 times at 5.0 AC peak-to-peak voltages (VPP) and the operating voltage decreased considerably for this BB ECL display compared to the B ECL display. The optimized R, G, and BB ECL displays showed stable emission with luminance of 63.2, 78.6, and 30.6 cd/m2, respectively, at 5.0 VPP. In addition, the flexible ECL displays exhibited stable emission properties even after 5,000 cycles of repetitive mechanical bending tests at a bending radius of 10 mm. These results demonstrate that ECL displays with a simple structure and fabrication process can be considered as a future alternative to conventional flexible displays.",
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