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Diagram of different phases of ViP™ OLED devices showing the independent optimization of subpixel common layers to enhance display efficiency.

High-efficiency pTSF-OLED made possible only by ViP™ technology

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Visionox and the research team of Professor Lian Duan at Tsinghua University jointly presented research results demonstrating OLED efficiency improvements through ViP™ (Visionox intelligent Pixelization) technology at ICDT 2026 (International Conference on Display Technology). This presentation is particularly noteworthy as it marks the first co-authored paper between Visionox, which has led the ViP™ process innovations, and Prof. Lian Duan’s group, which developed the pTSF (phosphor-assisted TADF-sensitized fluorescence) mechanism and contributed to its mass production adoption.

OLED panels fabricated using the fine metal mask (FMM) process have a pixel aperture ratio (APR) of only 20–30%. This narrow emitting area forces high current densities through the device, fundamentally accelerating efficiency roll-off and material degradation. On large-area substrates of Gen 8 and above, mask sagging makes precise alignment increasingly difficult, creating serious yield challenges for producing high-resolution OLED panels at 400 ppi and beyond.

The ViP™ technology, disclosed by Visionox in May 2023, patterns pixels via photolithography, enabling an APR exceeding 50%. Furthermore, unlike FMM, it allows the common layers of each R, G, and B sub-pixel — including HIL, HTL, EBL, ETL, and others — to be designed and optimized in complete independence.

The research team systematically investigated the efficiency-improvement effects of ViP™ technology along three axes: materials, layer thickness, and emission mechanism. In the FMM process, the hole transport material (HTM) has traditionally been selected based on the performance requirements of the blue device. With ViP™, however, the common layers for each sub-pixel can be chosen independently to match their respective emission characteristics.

Diagram showing the structural changes of ViP™ OLED devices from Reference to Phase 1 and Phase 2, illustrating the independent optimization of common layers (CAT, CPL, ETL, EBL, etc.) for each RGB subpixel

Structural optimization phases of ViP™ OLED devices revealed by Visionox and the Tsinghua University research team. It overcomes the limitations of FMM by independently designing the common layers of each subpixel to prove efficiency improvements. (Source: Visionox & Tsinghua University)

A comparison of three HTM materials sharing the same HOMO level (−5.2 eV) but differing in hole mobility revealed that a red device based on an HTM with significantly lower mobility degradation under high electric field conditions achieves an efficiency roll-off (G16/G255) of 101% — effectively zero — at high luminance, while extending LT95 lifetime by 48% relative to the reference device.

Two-stage optimization effects were quantitatively verified through SETFOS optical simulation. In Stage 1, individually tuning the cathode (CAT) and capping layer (CPL) thicknesses for the R and B devices alone improved white efficiency by 5%. In Stage 2, further optimizing the HTL, EBL, and ETL thicknesses for each of R, G, and B added an additional 9% (green), 3% (red), and 2% (blue) improvement. The combined white efficiency gain from both stages exceeds 7%, a magnitude comparable to a full year’s efficiency progress achievable through materials innovation (typically 5–10%).

ViP™ enables device structure optimization tailored to each emission color. A blue device based on the pTSF mechanism achieves theoretical efficiency 1.6–2.5× higher than that of a TTA (triplet-triplet annihilation) fluorescent device. Applying the pTSF mechanism across a white panel can boost overall efficiency by up to 55%. However, in FMM-based mass production lines, the HOMO/LUMO energy levels of the HTM and EBM required for pTSF green and pTSF blue pixels are mutually incompatible, making it practically impossible to raise efficiency within a single panel. ViP™ resolves this structural barrier and opens the path to integrating both a pTSF green device and a pTSF blue device within a single panel.

This study suggests that as ecosystem collaboration deepens between material suppliers and equipment manufacturers, the efficiency gains enabled by ViP™ technology will accelerate further. For next-generation applications demanding high resolution and low power consumption — large-format IT panels (monitors, laptops), AR/VR headsets, and automotive displays — the ViP™–pTSF technology combination is poised to emerge as a core source of differentiated competitive advantage that FMM-based mass production lines cannot replicate.

Changho Noh, Senior Analyst at UBI Research (chnoh@ubiresearch.com)

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Presentation slide outlining Visionox's pTSF technology roadmap from concept to 2026 mass production at ICDT 2026.

Visionox Achieves 95% of BT.2020 with pTSF Technology Advancement

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At ICDT 2026, Dr. Guomeng Li of Visionox presented the mass production roadmap for panels applying pTSF (Phosphor-assisted TADF-sensitized fluorescence) technology. He emphasized that by addressing key limitations of conventional phosphorescent OLEDs—such as broad emission spectra and shoulder peak issues—the technology marks a turning point in OLED color reproduction.

At SID 2025, Visionox had already demonstrated the feasibility of this approach by showcasing a pTSF-based green OLED achieving color gamut at the level of DCI-P3 and Adobe RGB.

Visionox's pTSF technology development and 2026 mass production roadmap presented by Dr. Guomeng Li at ICDT 2026

Visionox’s pTSF development roadmap presented by Dr. Guomeng Li at ICDT 2026. The goal is the full-scale mass production and commercialization of BT.2020 pTSF technology by 2026. (Source: UBI Research)

pTSF, a next-generation OLED emission technology, uses a phosphorescent material as a sensitizer to transfer energy to a narrow-spectrum fluorescent emitter, enabling 100% exciton utilization while improving color purity.

Visionox first presented pTSF performance at SID 2025 with a CIEx of less than 0.21. Less than a year later, at ICDT 2026, the company reported achieving a CIEx of 0.17 and approximately 95% of the BT.2020 color gamut. In addition, Visionox stated that, compared with its mass-produced phosphorescent OLEDs, the new structure delivered more than 30% higher efficiency and over 50% longer lifetime.

According to Visionox, these improvements were achieved by optimizing the combination of host materials, phosphor sensitizers, and narrow-spectrum fluorescent dopants, while also controlling the exciton recombination zone to reduce factors that degrade device performance. In particular, the company explained that expanding the recombination zone helped mitigate TTA and TPA, making it possible to improve both efficiency and lifetime at the same time. Visionox also added that stable characteristics were confirmed in evaluations including temperature-dependent IVL behavior, high-temperature driving stability, and capacitance variation.

Visionox also presented the development history and mass production plan for its pTSF technology. According to the presentation, the concept of pTSF was first proposed in 2014 by Professor Duan’s research team at Tsinghua University. By 2019, the company had established the technical foundation through the development of high-purity green materials based on multi-resonance structures, along with optimization of energy transfer and device architecture. It then proceeded with process and equipment validation as well as yield improvement through G4.5 pilot testing in 2021 and G6 testing in 2024, before unveiling a pTSF technology demonstrator at SID 2025. Visionox stated that in the second half of the same year, the technology entered the early stage of mass production and commercialization through customer products.

Visionox presented 2026 as the point at which BT.2020-level pTSF technology would be applied to mass production, and stated that it plans to further expand commercialization of the technology.

Changwook Han, Executive Vice President of UBI Research, commented, “The significance of pTSF lies not only in extending the color gamut, but in its ability to achieve BT.2020-level ultra-wide color reproduction while simultaneously securing both efficiency and lifetime. Competition in the premium OLED market is likely to become increasingly centered on color performance, and high-color-purity emission structures such as pTSF have strong potential to emerge as core technologies in the future.”

Changwook Han, Executive Vice President/Analyst at UBI Research (cwhan@ubiresearch.com)

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Display of Visionox's 4th generation pTSF OLED technology on smartphones at SID 2025.

Tsinghua-Visionox Officially Announces Mass Production of 4th-Generation OLED ‘pTSF’… “Beyond Catching Up with Korea, Achieving Technological Independence”

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China’s display industry has set a milestone beyond leading global production volume, advancing toward self-reliance in core material technologies. Tsinghua University and Visionox officially announced the successful mass production of Phosphor-assisted Thermally Activated Delayed Fluorescence Sensitized Fluorescence (pTSF) technology—a fourth-generation OLED light-emitting technology—at a jointly hosted technology forum held at Tsinghua University in Beijing on the 7th. They also unveiled achievements utilizing this technology. This announcement is considered a significant event, to announce that next-generation material technology, previously confined to the realm of academic possibility, has been successfully introduced into actual mass production lines and entered the commercialization stage.

The Phosphor-assisted Thermally Activated Delayed Fluorescence Sensitized Fluorescence (pTSF) technology developed by the joint research team is a fourth-generation solution that resolves the ‘Impossible Triangle’ challenge faced by conventional OLEDs—the difficult task of simultaneously achieving high efficiency, long lifetime, and high color purity. This technology operates on the principle of maximizing efficiency and lifespan by establishing a unique triple energy transfer system composed of a TADF host, a phosphorescent sensitizer, and a fluorescent emitter. It captures internal energy without loss and rapidly transfers it to the emitter.

Particularly noteworthy at this forum was the reconfirmed mass production performance data for the Green Phosphor-assisted Thermally Activated Delayed Fluorescence Sensitized Fluorescence (pTSF) device. This device garnered significant academic attention at ‘SID 2025’, the world’s largest display conference, held last May.

Visionox's low-power 'Product A' (left) and ultra-high image quality 'Product B' (right) pTSF OLED panels demonstrated at SID 2025 (Source: SID 2025)

Visionox’s low-power ‘Product A’ (left) and ultra-high image quality ‘Product B’ (right) pTSF OLED panels demonstrated at SID 2025 (Source: SID 2025)

Visionox has disclosed the performance of two panel types (Product A, Product B) manufactured on its G6 mass production line. The low-power specialized model ‘Product A’ reduces power consumption by 12% compared to existing phosphorescent OLED products and improves lifetime (LT95) by over 15%. Furthermore, Product B’, an ultra-high-definition specialized model, achieved a color reproduction rate exceeding 99.5% for both DCI-P3 and AdobeRGB color gamuts, demonstrating significant progress in image quality. This was achieved by applying the research team’s independently developed Exciplex host and optimizing the device structure to enhance energy transfer efficiency, while also reducing the usage of expensive dopant materials by approximately 10%.

The newly unveiled technology is expected to be brought to Honor’s Magic series or Nubia’s latest models. Honor and Nubia are longstanding core partners of Visionox, with a history of being the first to adopt Visionox’s new technologies (such as high refresh rates and UDC) in their flagship lineups. Therefore, it is highly likely they have also secured priority supply for this 4th-generation technology.

Building on the success of mass-producing these green phosphors, Tsinghua University and Visionox have outlined a roadmap to expand the application of Phosphor-assisted Thermally Activated Delayed Fluorescence Sensitized Fluorescence (pTSF) technology into the red and blue phosphor domains. The research team is currently focusing on securing the stability of red MR emitters and blue auxiliary phosphors, which are considered major technical challenges. Through this, they plan to achieve complete independence in material technology across the entire OLED spectrum. The Chinese side views this achievement as a significant turning point for the Chinese display industry, marking its transition from a follower to a technology leader.

Visionox's high-efficiency pTSF OLED device displayed at SID 2025 (Source: Visionox)

Visionox’s high-efficiency pTSF OLED device displayed at SID 2025 (Source: Visionox)

Changho Noh,  Senior Analyst at UBI Research (chnoh@ubiresearch.com)

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Visionox Implements 4th-Generation OLED Technology Using pTSF Mechanism

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Visionox announced at SID 2025 International Display Week that it has successfully demonstrated the commercialization potential of pTSF (Phosphor-assisted Thermally Activated Delayed Fluorescence Sensitized Fluorescence), a fourth-generation OLED technology. This technology is part of hyperfluorescence OLED technology, the fourth generation of OLED technology, and has been attracting attention as a key technology for the next-generation OLED display industry, as it simultaneously satisfies high color reproduction, high efficiency, and long life.

The research team developed green OLED devices with an ultra-wide color gamut that not only exceeds the DCI-P3 standard but also meets the requirements of AdobeRGB and BT.2020. In particular, the newly developed pTSF-based hyperfluorescence OLED device achieved high color purity with CIEx < 0.21 and FWHM (wavelength width) of 21-27 nm and reported up to 12% efficiency improvement and 20% lifetime improvement compared to existing commercial phosphorescence OLEDs.

The pTSF mechanism combines the excellent color purity of fluorescent emitters, the 100% exciton utilization of TADF hosts, and efficient energy transfer from phosphorescent assistant dopants, resulting in a more precise and stable emission system compared to traditional OLED structures. In addition, by optimizing the material deposition process for the G6 mass production line, material usage was reduced by over 10% without compromising quality.

Two prototype products—Product A and Product B—utilizing the pTSF technology were also developed. Compared to existing Visionox OLED products, Product A and B showed 12% and 6% lower power consumption, respectively, while achieving over 99.5% coverage of both DCI-P3 and AdobeRGB color gamuts. Furthermore, both maintained comparable reliability in high temperature and high humidity endurance tests.

A Visionox representative stated, “This milestone marks a pivotal step toward the commercialization of hyperfluorescence OLEDs. Starting with green, we aim to expand pTSF architecture to red and blue devices as well, ultimately achieving full BT.2020 color gamut coverage in next-generation OLED displays.”

The research was presented with sample demonstrations at SID 2025, and was conducted in collaboration with the Department of Chemistry at Tsinghua University, supported by China’s National Key R&D Program.

Wide color gamut Wide color gamut pTSF device flexible AMOLED solution pTSF High-efficiency pTSF device flexible AMOLED solution

Chang Ho NOH, UBI Research Analyst(chnoh@ubiresearch.com)

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