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 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)

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

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