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Flexible and monolithically integrated multicolor light emitting diodes using morphology-controlled GaN microstructures grown on graphene films
Flexible and monolithically integrated multicolor light emitting diodes using morphology-controlled GaN microstructures grown on graphene films
- Source :
- Scientific Reports, Scientific Reports, Vol 10, Iss 1, Pp 1-7 (2020)
- Publication Year :
- 2020
- Publisher :
- Nature Publishing Group UK, 2020.
-
Abstract
- We report flexible and monolithically integrated multicolor light-emitting diode (LED) arrays using morphology-controlled growth of GaN microstructures on chemical-vapor-deposited (CVD) graphene films. As the morphology-controlled growth template of GaN microstructures, we used position-controlled ZnO nanostructure arrays with different spacings grown on graphene substrates. In particular, we investigated the effect of the growth parameters, including micropattern spacings and growth time and temperature, on the morphology of the GaN microstructures when they were coated on ZnO nanostructures on graphene substrates. By optimizing the growth parameters, both GaN microrods and micropyramids formed simultaneously on the graphene substrates. Subsequent depositions of InGaN/GaN quantum well and p-GaN layers and n- and p-type metallization yielded monolithic integration of microstructural LED arrays on the same substrate, which enabled multicolor emission depending on the shape of the microstructures. Furthermore, the CVD graphene substrates beneath the microstructure LEDs facilitated transfer of the LED arrays onto any foreign substrate. In this study, Cu foil was used for flexible LEDs. The flexible devices exhibited stable electroluminescence, even under severe bending conditions. Cyclic bending tests demonstrated the excellent mechanical stability and reliability of the devices.
- Subjects :
- Nanostructure
Materials science
lcsh:Medicine
02 engineering and technology
Substrate (electronics)
Electroluminescence
01 natural sciences
Article
law.invention
law
Nanoscience and technology
0103 physical sciences
Lasers, LEDs and light sources
lcsh:Science
Quantum well
Diode
010302 applied physics
Multidisciplinary
business.industry
Graphene
lcsh:R
021001 nanoscience & nanotechnology
Microstructure
Optoelectronics
lcsh:Q
0210 nano-technology
business
Light-emitting diode
Subjects
Details
- Language :
- English
- ISSN :
- 20452322
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Scientific Reports
- Accession number :
- edsair.doi.dedup.....73606f64d6faa002367f6c15aaca6253