Self-powered fully-flexible light-emitting system enabled by flexible energy harvester

Chang Kyu Jeong, Kwi Il Park, Jung Hwan Son, Geon Tae Hwang, Seung Hyun Lee, Dae Yong Park, Han Eol Lee, Hwan Keon Lee, Myunghwan Byun, Keon Jae Lee

Research output: Contribution to journalArticlepeer-review

181 Scopus citations

Abstract

Energy-harvesting technology utilising mechanical energy sources is a promising approach for the sustainable, independent, and permanent operation of a variety of flexible electronics. A new concept of a fully-flexible light-emitting system, self-powered by a high-performance piezoelectric thin-film energy harvester has been first established by manipulating highly-robust, flexible, vertically structured light emitting diodes (f-VLEDs). The f-VLEDs fabricated by anisotropic conductive film bonding and entire wafer etching show stable and durable performances during periodic mechanical deformations. A high-output energy harvester capable of generating up to 140 V and 10 μA can be fabricated via laser lift-off (LLO) process widely used in industries, in a safe and robust manner. In particular, this LLO process is of great benefit for the fabrication of mechanically stable, flexible piezoelectric devices, without causing any degradation of piezoelectric properties. In this process, self-powered all-flexible electronic system with light emittance can be spontaneously achieved by the electricity produced from flexible thin-film generator by applying slight biomechanical energy without any externally applied energy storage. This conceptual technology of self-powering based on the conversion of mechanical energy to electrical energy can open a facile and robust avenue for diverse, self-powered, bio-implantable applications, as well as commercial display applications.

Original languageEnglish
Pages (from-to)4035-4043
Number of pages9
JournalEnergy and Environmental Science
Volume7
Issue number12
DOIs
StatePublished - 1 Dec 2014

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