Improvement of brightness, color purity, and operational stability of electrochemiluminescence devices with diphenylanthracene derivatives

Hwang, Heedong; Kim, Jin Kon; Moon, Hong Chul

doi:10.1039/c7tc03389c

Cited by 26 publications

(15 citation statements)

References 57 publications

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“…On the other hand, the PLS with B emission started emitting light at a relatively high 4.5 V PP , and when the voltage exceeded 6.0 V PP , a sharp deterioration of the device was observed. This degradation of the PLS with B emission was due to the unstable nature of DPA, a small-molecule semiconductor-based ECL material . The PLS with R, G, and B emission showed maximum luminances of 68.2, 84.7, and 35.4 cd/m 2 at 6.5, 6.5, and 6.0 V PP , respectively, implying that the optimized PLS has an operating voltage that is much lower than conventional AC-driven light-emitting type tactile sensors.…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, in the case of the PLS with B emission, the luminance remained at almost 21 cd/m 2 at only 60 cycles of repeated touches. After more than 60 cycles of repeated touches, the luminance of PLS with B emission quickly decreased due to the unstable nature of DPA, a small-molecule semiconductor-based ECL material …”

Section: Resultsmentioning

confidence: 99%

“…This degradation of the PLS with B emission was due to the unstable nature of DPA, a small-molecule semiconductor-based ECL material. 29 The PLS with R, G, and B emission showed maximum luminances of 68.2, 84.7, and 35.4 cd/m 2 at 6.5, 6.5, and 6.0 V PP , respectively, implying that the optimized PLS has an operating voltage that is much lower than conventional AC-driven light-emitting type tactile sensors. Figure 3e shows a light-emission image of PLS, in which the R, G, and B ECL light-emitting layers are simultaneously implemented on a floral pattern at 5.0 V PP .…”

Section: Resultsmentioning

confidence: 99%

“…After more than 60 cycles of repeated touches, the luminance of PLS with B emission quickly decreased due to the unstable nature of DPA, a small-molecule semiconductorbased ECL material. 29 Moreover, a mechanical bending test was performed at a bending radius of 10 mm to confirm the stability of the PLS. Figure S9 shows the luminance change in the PLS during dynamic bending tests up to 5000 cycles.…”

Section: Resultsmentioning

confidence: 99%

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Wearable and Semitransparent Pressure-Sensitive Light-Emitting Sensor Based on Electrochemiluminescence

Kwon

Myoung

2020

ACS Nano

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Tactile sensors are being researched as a key technology for developing an electronic skin and a wearable display, which have recently been attracting much attention. However, to develop a next-generation wearable tactile sensor, it is necessary to implement an interactive display that responds immediately to external stimuli. Herein, a wearable and semitransparent pressure-sensitive light-emitting sensor (PLS) based on electrochemiluminescence (ECL) is successfully implemented with visual alarm functions to prevent damage to the human body from external stimuli. The PLS is fabricated with a very simple structure using the ECL gel as the lightemitting layer and a carbon nanotube embedded polydimethylsiloxane as the electrode. The ECL light-emitting layer using a redox reaction is advantageous for the fabrication of nextgeneration wearable devices due to the advantages of a simple structure and the use of electrodes without work function limitation. The PLS can display various external stimuli immediately and operate at a high luminance, making it safe to use as a wearable sensor. Therefore, the PLS using ECL can be a simple and meaningful solution for next-generation wearable tactile sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Wearable and Semitransparent Pressure-Sensitive Light-Emitting Sensor Based on Electrochemiluminescence

Kwon

Myoung

2020

ACS Nano

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“…[1][2][3][4][5][6][7][8] ECL has traditionally been employed in DNA analysis, immunoassays, and bio-sensors due to its outstanding selectivity and sensitivity. [12][13][14][15][16][17] Although ECL devices have remarkable features that have not been included in conventional displays such as organic light emitting diodes (OLEDs), several issues need to be addressed before ECL devices can be practically applied. In addition, such devices can be fabricated in ambient conditions via solution processes such as spin-coating and printing, which is advantageous for large-area and mass production.…”

Section: Introductionmentioning

confidence: 99%

Balancing the Concentrations of Redox Species to Improve Electrochemiluminescence by Tailoring the Symmetry of the AC Voltage

Kim

Jeong

et al. 2018

ChemElectroChem

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We propose an effective methodology to improve the brightness of Ru(bpy) 3 2 + -based electrochemiluminescence (ECL) devices driven by the annihilation path, based on an understanding of the great importance of concentration balance between oxidized Ru(bpy) 3 * 3 + and reduced Ru(bpy) 3 * 1 + species. From cyclic voltammetry experiments, we verify that Ru(bpy) 3 *3 + is more stable than Ru(bpy) 3 * 1 + , which is a fundamental physical parameter for balanced electrochemical annihilation reaction. Accordingly, we adjust the symmetry (i.e. the duty ratio) of the input AC voltage to control the concentrations of redox species. The frequency and peak-to-peak voltage (V pp ) are fixed at 60 Hz and 7.5 V pp , respectively. When the duty ratio is 40 %, a luminance of approximately 174 Cd/m 2 is detected, which is brighter than the 148 Cd/m 2 achieved under a symmetric voltage wave. We investigate the feasibility of further enhancing device luminance by modulating the frequency of applied voltage at the fixed duty ratio of 40 %, achieving a maximum luminance of approximately 207 Cd/m 2 at 150 Hz. Overall, this work elucidates the critical role of electrochemical stability of redox species that participate in the light-emitting annihilation reaction and suggests a simple but effective route (e.g. adjusting symmetry of AC input) to improve luminance of ECL devices.

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Light‐Emitting Devices Based on Electrochemiluminescence Gels

Cho

Lee

et al. 2020

Adv Funct Materials

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Electrochemiluminescence (ECL) is a self‐emission of light from electrochemically excited luminophores via a series of redox reactions. Over the past decade, light‐emitting devices based on gel‐phase ECL active materials, i.e., gel electrolyte composites (referred to as ECL gels) containing an ECL luminophore, electrolyte, and network matrix, have attracted considerable attention as a complementary device platform to conventional electroluminescent devices for low‐cost printable displays and solid‐state light sources. Although the ECL phenomenon is extensively exploited in analytical diagnostics and sensing, the development of printable and fast‐response gel‐type luminescent materials may further expand the potential application of ECL in solid‐state flexible, bendable, and stretchable light‐emitting devices. This review summarizes the operation mechanisms of ECL‐based light‐emitting devices, ECL emitters and electrolytes, engineering strategies for obtaining printable high‐strength/high‐conductivity ECL gels, and emerging applications of gel‐type ECL devices.

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Improvement of brightness, color purity, and operational stability of electrochemiluminescence devices with diphenylanthracene derivatives

Abstract: We synthesized a highly soluble ionophilic 9,10-diphenylanthracene (I-DPA) by incorporating imidazolium groups into a DPA core.

Cited by 26 publications

References 57 publications

Wearable and Semitransparent Pressure-Sensitive Light-Emitting Sensor Based on Electrochemiluminescence

Wearable and Semitransparent Pressure-Sensitive Light-Emitting Sensor Based on Electrochemiluminescence

Balancing the Concentrations of Redox Species to Improve Electrochemiluminescence by Tailoring the Symmetry of the AC Voltage

Light‐Emitting Devices Based on Electrochemiluminescence Gels

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