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.
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.