Today we have made an exciting announcement – Kyulux succeeded in improving the performance of its blue OLED Hyperfluorescence™ emitter.
Hyperfluorescence™ materials are the fourth-generation OLED light emitting technology. The result will be announced at The 3rd International TADF Workshop to be held in Fukuoka on July 19th. Kyulux has succeeded in extending the lifetime of its blue material while maintaining its high external quantum efficiency (EQE) of 20% or more, at practical brightness levels.
Kyulux’s latest material features an EQE of up to 26%, and specifically an EQE of 22% at 1,000 cd/m2 brightness. The emission wavelength is 470 nm at the peak value. The lifetime of the material is quoted at 100 hours at LT95 (at 750 cd/m2). An LT95 means that the brightness decreases 5% after 100 hours of use at a brightness of 750 cd/m2.
Kyulux’s Hyperfluorescence™ is the world’s top performing materials at the moment, and the company now aims to work together with OLED panel makers to improve the systems further by optimizing the device structure and the rest of the OLED stack in pilot production lines.
The premier display industry event, SID DisplayWeek, is now over – and it was a great week. Kyulux had a successful booth demonstration, with a lot of interest from display companies as HF/TADF emitter technology is maturing and is ready to be commercialized.
During the show, Kyulux unveiled Wisechip’s flexible HF PMOLED display, which we already posted on. This display is set to be the world’s first commercial HF display, and will hopefully enter mass production by the end of the year. Kyulux also demonstrated a smaller yellow PMOLED HF device, again produced at Wisechip. This is a 0.87-inch display with a resolution of 216×128. In the demonstration, Kyulux showed how the HF display is almost twice as bright (210 nits vs 110 nits) than Wisechip’s regular fluorescent PMOLED, using the same amount of power.
Last week at the SID DisplayWeek in Los Angeles, CA, Kyulux demonstrated Wisechip’s latest flexible PMOLED display – that uses Kyulux’s Hyperfluoresence yellow emitter. The power consumption of this display, compared to Wisechip’s fluorescent yellow, is almost half!
The Wisechip flexible display is 42.22 mm x 10.54 mm in size (1.71″ diagonal), with a resolution of 256×64 pixels. This display is now ready to be produced and Wisechip believes it will enter mass production before the end of 2018. If so this will be the world’s first HF (TADF) powered device!
The first-generation OLED emitter systems, based on fluorescence, lack efficiency as only about 25% of the energy is converted into light. More advanced systems, based on phosphorescence (PHOLED), TADF and our own HyperFluorescence (HF) technology all manage to convert almost 100% of the energy into light, and so it is mistakenly perceived that such systems all offer the same efficiency.
The reality, however, is that Kyulux’s HF systems offer an inherent advantage that enables it to provide the most efficient OLED emitters of all four generations. As seen in the graph above, HF emitters are the only emitters that offer both a narrow spectrum and high-efficiency. HF can be thought of as a combination of the high efficiency of TADF and the narrow spectrum of Fluorescence.
Wisechip demonstrated a yellow PMOLED device that featured a lifetime of over 30,000 hours (LT50) and an EQE of 14.6%, while still maintaining high color purity. Wisechip aims to release the first yellow and green HF PMOLEDs by the end of 2017, with red, blue and white displays planned for commercial launch in the near future.
During the TADF Workshop which was held in July 2017 in Kyushu, Japan, Wisechip’s VP of R&D Engineering Division, Dr. York Tsai, gave a presentation that detailed the Hyperfluorescence-PMOLED development effort that led to the successful demonstration and future introduction. It was a great presentation that clearly showed the advantages of our materials and their applications in Wisechip’s PMOLED displays.
The demonstrated display was a 0.96″ 128×64 monochrome (yellow) PMOLED. The EQE of the HF model is 14.5% compared to only 7.1% in the fluorescence display. We have now published the video above that very nicely shows the display in action and the whole demonstration – even though it is quite difficult to see just how brighter the HF display is. The image below shows this better.