Chung-Ang University, under the leadership of President Park Sang-kyu, has made significant advancements in OLED technology, particularly in the realm of phosphor-sensitized fluorescence (PSF) OLEDs. Professors Kim Jae-min of Chung-Ang University and Lee Jun-yeop of Sungkyunkwan University collaborated on a research project that successfully developed a 'Multiscale Energy Transfer (MET) Model'. This innovative model allows for the precise quantification and analysis of the energy transfer mechanisms occurring within PSF OLEDs, overcoming the previous challenges associated with distinguishing between beneficial Förster energy transfer (FRET) and detrimental Dexter energy transfer (DET).

The MET model provides a framework for understanding the complex energy transfer processes that had previously resulted in the multiple-solution issue within OLED research. With this model, the research team has established a means to independently quantify the rates of FRET and DET, which enables accurate predictions of energy flow under various conditions without the need for additional experiments. They introduced a new phosphorescent sensitizer, 'Pt-BS', which proved to significantly inhibit DET by 31.8% compared to traditional sensitizers, while simultaneously increasing the conversion efficiency to light by 120%.

The implications of their findings are profound, as the high-performance ultramarine blue PSF OLED achieved an external quantum efficiency (EQE) of 21.1%, marking it as one of the highest-performing OLED devices in that color range (CIE y = 0.100). This research not only advances the academic understanding of energy transfer in OLEDs but also establishes industrial guidelines for the precise control of these complex processes, underscoring its high academic and industrial value.