Coaxial heterojunction nanowires based on ZnO and ZnSe for applications in flexible light emitting diodes

Project Director: Dr. Andreea COSTAS

Project ID: PN-III-P2-2.1-PED-2021-3984

Project leader: Dr. Andreea Costas
Project type: National
Project Program:  PED
Funded by:  Romanian National Authority for Scientific Research, UEFISCDI
Contractor:  National Institute of Materials Physics


Dr. Andreea Costas - project leader

Dr. Ionut Enculescu

Dr. Nicoleta Preda

Dr. Monica Enculescu

Dr. Corina Ciobotaru

Dr. Mihaela Beregoi

Dr. Andrei Kuncser

Dr. Mihaela Bunea

Drd. Melania Onea

Nowadays flexible optoelectronic devices have a significant impact in many areas of research. Particularly, in the last years, flexible light emitting diodes (LEDs) focused the attention of the researchers, representing an energy efficient lighting technology due to their substantial role in reducing the global energy consumption, making them the perfect candidates for street lighting in Smart Cities. Compared to the conventional light sources, flexible LEDs present a series of advantages, like flexibility, lumen efficiency, low power consumption, long life time, controllable emission properties and the possibility to use wavelengths from ultraviolet to infrared. Such features recommend LED’s for applications in rollable displays, wearable intelligent electronics, light sources, sensors, optical fibers, digital displays, traffic lights, communications, medical treatments, etc. Thus, LED devices have become very important from scientific and socio-economic point of view. In this context, the scope of the project is the development proof-of-concept energy efficient flexible light emitting diodes with low power consumption and improved light extraction efficiency, the LEDs being based on vertically aligned coaxial ZnO-ZnSe heterojunction nanowires arrays and on single coaxial ZnO-ZnSe heterojunction nanowires. The coaxial ZnO-ZnSe heterojunction nanowire arrays will be prepared using Zn foils and Si/SiO2 wafers patterned with specific geometries as substrates, combining thermal oxidation in air with RF magnetron sputtering, two simple and low cost techniques. Fabricating flexible and nanoscale LEDs based on coaxial ZnO-ZnSe nanowires, will provide new insights in the field of light emitting diodes, expanding the possibilities for their implementation in applications such as rollable displays, street lighting and wearable intelligent electronics, energy efficient devices.

Scientific papers presented at international conferences:

  1. “Semiconductor core-shell nanowires: synthesis, characterization and photodetecting applications”, Andreea Costas, Nicoleta Preda, Monica Enculescu, Andrei Kuncser, Ionut Enculescu, poster presentation at the 2022 12th International Advances in Applied Physics & Materials Science Congress & Exhibition (APMAS).

Dr. Andreea Costas

National Institute of Materials Physics


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