Chinese panel companies increasingly adopting tandem structure/PSF-based OLED technology for smartphones
The focus of smartphone OLED technology development is shifting from resolution and driving technology to attempts to simultaneously apply new light-emitting materials and tandem stack (layered) architectures. Recently, Chinese panel companies like Tianma, BOE, and Visionox have successively unveiled next-generation OLED technologies combining PSF (Phosphor-Sensitized Fluorescence) series emitting materials—a fourth-generation OLED technology—with tandem structures at major exhibition stages such as CES 2026 and Display Week 2025. These technologies collectively aim to achieve ultra-wide color gamut, high brightness, and improved power efficiency.
At CES 2026, Tianma demonstrated its NFT (New Fluorescence Technology) and SLOD (Stacked Layer OLED Device) concepts applying PSF principles. NFT enhances energy transfer efficiency while maintaining the color purity of fluorescence-based emitting materials. Combined with the SLOD structure, it emphasizes optimizing low-voltage CGL (Charge Generation Layer) and emitting unit designs. According to Tianma’s explanation, SLOD technology is closer to a direction of boosting efficiency by co-designing the light-emitting material–CGL–stack structure, rather than simply expanding the stacking of layers in a Tandem structure.

Tianma showcases its SLOD (Stacked Layer OLED Device) achieving 96% BT.2020 color coverage at CES 2026. (Source: Tianma)
BOE exhibited a smartphone OLED solution at Display Week 2025 that combines a Tandem (2-stack) structure with COE (Color filter on Encapsulation) on PSF-based light-emitting materials. BOE demonstrated a direction to achieve a color gamut approaching BT.2020 through spectrum width reduction (FWHM reduction) and peak coordinate shift, while simultaneously improving efficiency and lifespan by lowering current density at the same luminance through the Tandem structure. This is evaluated as an example proposing the light-emitting material, structure, and optical elements as a single integrated package. Meanwhile, Huawei officially announced the Mate 80 RS, featuring BOE’s PSF-based light-emitting material combined with a Tandem (2-stack) structure, in late November 2025, with sequential launches beginning in late November. The industry notes that this timing marks the beginning of ‘Tandem OLED + BT.2020’ specifications being applied to actual flagship products. This is interpreted as a case where the commercialization of technology combining high-color-purity new light-emitting materials (PSF/TADF/pTSF series) with Tandem architecture is spreading in earnest.
Visionox also officially declared the mass production success of pTSF (Phosphor-assisted Thermally Activated Delayed Fluorescence Sensitized Fluorescence), its fourth-generation OLED light-emitting technology, at a technology forum jointly held with Tsinghua University in December 2025.
According to UBI Research’s analysis, applying next-generation high-color-purity emitting materials and tandem structures in smartphones is evaluated as a powerful means to mitigate OLED’s physical limitations. However, expanding layered structures and introducing new materials may lead to increased costs, yield management challenges, and greater difficulty in driving and calibration. There is also the possibility that ultra-wide color gamut and ultra-high brightness could become excessive specifications relative to the average user’s perceived experience. The industry views the recent trend not as a complete shift, but rather as a phase where certain technologies are entering mass production and being selectively adopted.
Changho Noh, Senior Analyst at UBI Research (chnoh@ubiresearch.com)
2025-2026 Beyond Mobile: IT OLED Technology and Industry Analysis Report
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