Second-generation OLED phosphorescence emission features an internal quantum efficiency of almost 100% - which would normally mean you cannot get more efficient than that.
As Kyulux explains in a recent post, though, phosphorescent suffers from a wide emission spectrum. In order to achieve a good color gamut (for which as narrow-spectrum emission as possible is best) display makers have to filter out the "tail" of the emission. This results in reduced brightness and efficiency.
Kyulux's 4th-Gen emission technology, Hyperfluorescence, offers a narrow emission spectrum, while still maintaining an almost 100% IQE. This means that the total system efficiency of HF-based OLEDs can be higher than that of PHOLED OLEDs.
The narrow spectrum also means that for the same energy, the peak-brightness of the OLED device is higher. This is another advantage - for HDR displays, for example, one could reach the same peak brightness with a lower current, which will extend the lifetime of the display and increase efficiency.
According to a simulation done at Kyulux, a top-emission green HF OLED enjoys a 60% higher peak brightness compared to a commercial Phosphorescence OLED - which would translate to a 10% higher External Quantum Efficiency (EQE).
Last week Kyulux announced that it is on track to commercialize its first AMOLED emitter systems in 2023. and the company is now working closely with OLED makers. This could be great news for the industry, if indeed the company's materials outperform currently used materials.
