The HELIOS project was represented at the International Conference on Nanotechnologies and Nanomaterials (NANO-2026), held on 26–28 August 2026 in Chernivtsi. Prof. Pavlo Stakhira and Stepan Kutsiy of the Department of Electronic Engineering, Lviv Polytechnic National University, took part on behalf of the project.
NANO-2026 is organised by the Institute of Physics of the National Academy of Sciences of Ukraine together with Yuriy Fedkovych Chernivtsi National University and a group of international partners — the University of Tartu, the University of Turin, Sorbonne University, European Profiles A.E. and the Representation of the Polish Academy of Sciences in Kyiv. Held in hybrid format, it brought together more than 600 participants from over 30 countries across nine thematic areas, from nanochemistry and nanobiotechnology to nanoplasmonics.
What was presented
In the Nano-optics and photonics session, the team presented “White Single-Molecule Organic Light-Emitting Heterostructures” by S. A. Kutsiy, M. S. Shchetinin, I. Y. Yaremchuk and P. I. Stakhira.
Most white OLEDs today are trichromatic: white light is mixed from three separate emitter molecules — red, green and blue. That approach works, but it complicates manufacturing and leaves devices prone to colour shift as they age or as the driving voltage changes. The single-molecule approach replaces the trio with one complex molecule that emits across the whole visible spectrum.
The team incorporated two novel single-molecule white emitters, Dye1 and Dye2, into host–guest devices with the structure ITO/HAT-CN/TAPC/TCTA/Dye:mCP/TSPO1/TPBi/LiF/Al. Both devices showed electroluminescence spectra with four distinct emission bands and, on the basis of their CIE 1931 coordinates and correlated colour temperatures above 4400 K, were classified as warm-white OLEDs.
The most striking result was spectral stability. Raising the driving voltage from 7 to 12 V changed the emission spectra only marginally, with CIE 1931 coordinates shifting by no more than Δx = 0.01 and Δy = 0.02 — the colour-drift problem that dogs conventional white OLEDs, largely absent. Device D1 reached a peak external quantum efficiency of 3.74% at 5.5 V, falling to 2.48% at 12 V, with a more pronounced roll-off above 7 V. Device D2 performed better under load: a slightly higher initial EQE of 3.9% at 5.5 V that declined only gradually, still delivering 3.70% at 12 V.
Why it matters for HELIOS
Simplifying white light down to a single emitting molecule is one of the most direct routes to the goal HELIOS was set up to pursue — white organic lighting that is efficient, colour-stable and realistic to manufacture at scale. Fewer emitters mean fewer deposition steps, lower cost and better reproducibility, while the stable CIE coordinates address one of the practical objections to OLED lighting in real installations.
Conferences such as NANO-2026 also serve the project’s networking objectives: they put the HELIOS team in direct contact with the Ukrainian and international nanoscience community, and help build the visibility that a twinning project depends on.
This work has received funding from Horizon Europe, the European Union’s framework programme for research and innovation (2021–2027), under the HELIOS project, grant agreement No 101155017.
The HELIOS project was represented at the International Conference on Nanotechnologies and Nanomaterials (NANO-2026), held on 26–28 August 2026 in Chernivtsi. Prof. Pavlo Stakhira and Stepan Kutsiy of the Department of Electronic Engineering, Lviv Polytechnic National University, took part on behalf of the project.
NANO-2026 is organised by the Institute of Physics of the National Academy of Sciences of Ukraine together with Yuriy Fedkovych Chernivtsi National University and a group of international partners — the University of Tartu, the University of Turin, Sorbonne University, European Profiles A.E. and the Representation of the Polish Academy of Sciences in Kyiv. Held in hybrid format, it brought together more than 600 participants from over 30 countries across nine thematic areas, from nanochemistry and nanobiotechnology to nanoplasmonics.
What was presented
In the Nano-optics and photonics session, the team presented “White Single-Molecule Organic Light-Emitting Heterostructures” by S. A. Kutsiy, M. S. Shchetinin, I. Y. Yaremchuk and P. I. Stakhira.
Most white OLEDs today are trichromatic: white light is mixed from three separate emitter molecules — red, green and blue. That approach works, but it complicates manufacturing and leaves devices prone to colour shift as they age or as the driving voltage changes. The single-molecule approach replaces the trio with one complex molecule that emits across the whole visible spectrum.
The team incorporated two novel single-molecule white emitters, Dye1 and Dye2, into host–guest devices with the structure ITO/HAT-CN/TAPC/TCTA/Dye:mCP/TSPO1/TPBi/LiF/Al. Both devices showed electroluminescence spectra with four distinct emission bands and, on the basis of their CIE 1931 coordinates and correlated colour temperatures above 4400 K, were classified as warm-white OLEDs.
The most striking result was spectral stability. Raising the driving voltage from 7 to 12 V changed the emission spectra only marginally, with CIE 1931 coordinates shifting by no more than Δx = 0.01 and Δy = 0.02 — the colour-drift problem that dogs conventional white OLEDs, largely absent. Device D1 reached a peak external quantum efficiency of 3.74% at 5.5 V, falling to 2.48% at 12 V, with a more pronounced roll-off above 7 V. Device D2 performed better under load: a slightly higher initial EQE of 3.9% at 5.5 V that declined only gradually, still delivering 3.70% at 12 V.
Why it matters for HELIOS
Simplifying white light down to a single emitting molecule is one of the most direct routes to the goal HELIOS was set up to pursue — white organic lighting that is efficient, colour-stable and realistic to manufacture at scale. Fewer emitters mean fewer deposition steps, lower cost and better reproducibility, while the stable CIE coordinates address one of the practical objections to OLED lighting in real installations.
Conferences such as NANO-2026 also serve the project’s networking objectives: they put the HELIOS team in direct contact with the Ukrainian and international nanoscience community, and help build the visibility that a twinning project depends on.
This work has received funding from Horizon Europe, the European Union’s framework programme for research and innovation (2021–2027), under the HELIOS project, grant agreement No 101155017.
Conference announcement: https://www.nas.gov.ua/en/news/mizhnarodna-konferenciya-z-nanotehnologiy-ta-nanomaterialiv-nano-2026-anons
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