Since most electrolytes used in previous works exhibit a low ionic conductivity, the resulting ECL devices suffer from a long response time that is larger than a few seconds 4, 13. As a result, extensive researches have been conducted to determine the optimum emissive materials, device structure, and fabrication processes to obtain high performance ECL devices 7, 8, 9.Ĭonventional ECL devices are composed of ionic transition metal complexes (ITMC) or conjugated polymeric (CP) semiconductors blended with supporting solid electrolytes based on Li salts and poly(ethylene oxide) host polymers 10, 11, 12. In addition, the solution-based active layer deposition can eliminate complex and expensive vacuum processes with no restriction on the electrode materials. In contrast to OLEDs – which consist of multiple stacks of organic layers, such as charge transport layers, charge injection layers, and emissive layers – ECL devices only need a single emissive layer sandwiched between two electrodes to support the entire luminescent process for light emission, including charge injection, transport, and electron-hole recombination 5, 6, and this simple device architecture (electrode/emissive layer/electrode) allows cost-effective device fabrication.

ECL devices have recently become a significant target of interest by researchers since these represent a possible alternative to organic light emitting diodes (OLEDs). It is notable that the result is the first work to realize sticker displays based on electrochemical light emitting devices and can open up new possibilities for flexible or disposal display.Įlectrochemiluminescent (ECL) cells are light emitting devices that emit light through the radiative relaxation of excited luminophores that have been generated by electrochemical charge transfer reactions between reduced and oxidized species 1, 2, 3, 4, 5. The sticker-type ECL devices can be operated under an AC bias and exhibit a low operating voltage of 4 V (peak-to-peak voltage) with a maximum luminance of 90 cd/m 2. The resulting ion gels exhibit excellent mechanical strength to form free-standing rubbery light-emitting electrolyte films, which enables the fabrication of sticker-type display by simple transfer and lamination processes on various substrates. The self-supporting ion gels were formulated by mixing a network-forming polymer, ionic liquid, and metal complex luminophore. Here, we report sticker-type electrochemiluminescent (ECL) device using self-supporting, light-emitting gel electrolytes. However, the disposable device has unfortunately not materialized yet due to the light-emitting materials and fabrication process issues.

Nowadays, there has been an increasing demand to develop low-cost, disposable or reusable display devices to meet and maximize short-term user convenience.

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