Kyulux demonstrated a white OLED display that uses an orange TADF emitter combined with a blue fluorescence emitter. The novel display was developed in collaboration with the Fukuoka i3 center for Organic Photonics and Electronics Research (i3-OPERA) for demonstration at the 3rd International TADF Workshop in late July.
The display was designed by i3-OPERA and Kyulux provided the orange TADF emitter. This demonstration successfully showed the commercial viability of a TADF-based white OLED display. Kyulux and the i3-OPERA will continue the collaboration to enhance the performance and the lifetime of this display. The next step in this project is use only TADF emitters including a blue TADF emitter.
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 Hyperfluorescence 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.
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.
Hyperfluorescence emitters enabled WiseChip to boost the efficiency by around 50% while still maintaining the color purity and a lifetime of over 30,000 hours (LT50).
Following this announcement, questions were raised as to the relevance of this technology for use in AMOLED displays, which represents a much larger market ($20 billion in 2017 and continue to grow fast compared to PMOLEDs’ $0.5 – 1 billion). Even though one should not rush to discount the PMOLEDs market, which is expected to stay relevant and grow (with the rise of wearables and introduction of flexible and transparent displays), it is clear that the AMOLED segment of the market remains dominant. In this article, we set out to clarify the difference between the two technologies and lift any doubt regarding the readiness of HF technology for AMOLED displays.
Kyulux, Inc., a world leader in next generation organic light emitting diode (OLED) technology, and WiseChip, a leading manufacturer of organic light emitting diode (OLED) products, today announced that the two companies plan to release a commercial product utilizing 4th generation HyperfluorescenceTM OLED light emission technology. This will be the first commercial product using this new generation of organic compounds in a commercial display product.
HyperfluorescenceTM is a 4th generation OLED technology that outperforms all previous generations of OLED emitters. The first generation of fluorescent compounds used for blue pixels in today’s cell phones and televisions are only 25% efficient and thus reduce the energy efficiency or battery life. The second generation green and red emitters used in cell phones and televisions are 100% efficient, but they use an expensive rare metal Iridium. This second generation of materials also suffers from an inferior color purity compared to the first generation. Fourth generation HyperfluorescenceTM allows for 100% quantum efficiency in a completely organic molecule without requiring the use of rare heavy metals to attain 100% efficiency. Further, HyperfluorescenceTM technology combines the superior color purity of gen 1 materials and the efficiency of gen 2 materials, allowing for increased battery life or increased brightness without sacrificing color purity.
WiseChip plans to begin offering commercial display products incorporating HyperfluorescenceTM by Q4 2017 and will become the first OLED display manufacturer to offer these 4th generation OLED displays for PMOLED applications. Through a highly collaborative engineering partnership, WiseChip and Kyulux have been able to rapidly increase the lifetime of TADF and HyperfluorescenceTM OLED devices even at the high current densities required for PMOLED applications. WiseChip and Kyulux will initially offer 4th generation monochromatic yellow and green displays, with red, blue and white displays planned for commercial launch in the near future.