Polymer OLEDs consist of several organic compounds, sandwiched together between two charged electrodes and operate on the principle of converting electrical energy into light, phenomenon known as electroluminescence. In order to optimize OLED efficiency, correlating the polymer structure with the device performance is essential. With the proper stacking of the organic layers, these materials result in a device that can achieve the required high efficiency and long lifetime.

Schematic representation of the structure of the OLED devices  & representative Electroluminescence emission spectra

Our story


As the low cost, printed & flexible OLEDs attract great interest, OET has expanded its activities in light and power management to energetic light emitting devices.

After having established a fundamental knowledge about processing various OLED materials from solution, in middle scale coating techniques, OET aims at roll-to-roll processes, which offer better choices for mass production of low-cost & competitive fully printed OLEDs.

OET pioneers in this field by incorporating its perennial experience in R2R processing on flexible substrates and paves the way in the European community on flexible and printed OLED technology by leading in National and European R&I projects (i.e. SmartLine, Apollon).

 OET’s R&D group currently develops Blue, Green, Yellow and Red OLEDs, while concentrating its efforts in White emission OLEDs for outdoor lighting. Indicatively, a threshold operating voltage as low as 3V with a maximum luminance of above 1500 cd/m² is achievable.

Superior Characteristics​ OLED

Structural Characteristics

Emission Characteristics

  • Thin (<1mm)

  • Flexible

  • Lightweight (<0.5kg/m²)

  • Low Production Cost

  • Custom shapes

  • Custom sizes

  • Easy Adaptation (Static & Portable Applications in Various Environments)

  • Production in large scale by R2R printing processes

Variety in Color emissions

  • UV Free

  • Low Glare

  • Low Heat Generation

  • Eco-Friendly Lighting Sources

  • (Organic Substances)

  • Eye-Friendly Surface Light Source

  • (Absence of Hard Edged Shadowing)

2015 - 2016
Rigid OLEDs
2017 - 2018
Color variery on Rigid OLED's
2018 - 2019
Lab Scale White, Middle Scale Hybrid Flexible
2019 - 2020
Hybrid OLED Efficiency Increase
2020 - 2021
Fully Printed OLED
2021 - 2022
Upscaling to R2R Pilot Production
2022 - 2023
R2R Mass Production

Relevant ​ Publications

“Photophysical and Electro-Optical Properties of Copolymers Bearing Blue and Red Chromophores for Single-Layer White OLEDs, Nanomaterials 2021, 11(10), 2629. DOI: 10.3390/nano11102629

“High Efficiency Solution Processable Polymer OLEDs: Manufacturing and Characterization”, Materialstoday: Proceedings, (2021). DOI: 10.1016/j.matpr.2021.02.692

“Optical characterization of organic light-emitting diodes with selective red emission, Materialstoday: Proceedings, (2021). DOI: 10.1016/j.matpr.2021.02.685

“Optical and electrical characterization of blended active materials for white OLEDs (WOLEDs), Materialstoday: Proceedings, (2021). DOI: 10.1016/j.matpr.2021.02.686

“Optical and emission properties of terpolymer active materials for white OLEDs (WOLEDs)”, Materialstoday: Proceedings, (2021). DOI: 10.1016/j.matpr.2021.02.512

“The future in lighting, OPE Journal No. 32 (2020).

“Fabrication and Study of White‐Light OLEDs Based on Novel Copolymers with Blue, Yellow, and Red Chromophores”, Physica Status Solidi (RRL) – Rapid Research Letters 13(2) (2019). DOI: 10.1002/pssr.201800419

“A comprehensive study of the optical properties of emitting polymers for efficient flexible OLED devices”, Physica Status Solidi (A) – Applications and Materials 213(11) (2016). DOI: 10.1002/pssa.201600651