A team of researchers led by Prof. Forrest at the University of Michigan designed a new highly promising blue phosphorescent OLED emitter. The researchers demonstrated a tandem device that is based on these new emitters, that increased the lifetime 250 times compared to a conventional single-stack PHOLED device. This new design provide a real path towards a commercial blue PHOLED device.
To achieve that dramatic increase in lifetime, the researchers applied a polariton-enhanced Purcell (PEP) cathode and anode, to create a so-called PEP-PHOLED device. The blue color coordinate is CIExy = (0.14, 0.12). The researcher say that this double-sided PEP effect can be integrated with other established lifetime-extending technologies.
The research detail the performance, and most impressive is a Pt-complex-based tandem PEP-PHOLED on flat glass substrates with substrate light extraction that features lifetimes of 1,800 hours LT90 (at 500 cd/m2), with a forward-viewing EQE of 56%.
Researchers have been trying to develop commercial blue phosphorescence OLED devices for over 20 years. Universal Display, working with the University of Michigan for many years, has recently announced that its blue PHOLED materials are close to commercialization, and LG Display has verified these latest material in a hybrid tandem-stack device. This new dramatic research breakthrough could be the final step that brings PHOLEDs to commercial displays in standard architectures.
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