From Event: SPIE Organic Photonics + Electronics, 2017
Since its first demonstration in 1998, electrophosphorescence has yielded 100% internal quantum efficiency OLEDs (PHOLEDs) across the color gamut. This advance has given birth to a huge global OLED display industry, now estimated to be >$15B, or more than 10% of all displays made. While red and green devices have shown extraordinary operational lifetimes, blue PHOLEDs have had unacceptably short lifetimes. In this talk I discuss the fundamental origins of this deficiency1, and approaches to extending the lifetime of blue PHOLEDs. Indeed, recent results in our laboratory have already yielded a 10 fold improvement in lifetime, the first such major improvement in almost a decade2. The understanding gained from these experiments suggest that much longer lifetimes, even for very deep blue emitting PHOLEDs, is possible. In particular, I will discuss the use of hot excited state managers as a means to greatly extend the lifetime of blues for both displays and lighting.
1. N. C. Giebink, B. W. D’Andrade, M. S. Weaver, P. B. Mackenzie, J. J. Brown, M. E. Thompson and S. R. Forrest, J. Appl. Phys. 103, 044509 (2008).
2. Y. Zhang, J. Lee and S. R. Forrest, Nature Commun. 5, 5008 (2014).
Stephen R. Forrest, "Extending the lifetime of blue phosphorescent OLEDs (Conference Presentation)," Proc. SPIE 10362, Organic Light Emitting Materials and Devices XXI, 103620M (Presented at SPIE Organic Photonics + Electronics: August 07, 2017; Published: 19 September 2017); https://doi.org/10.1117/12.2276252.5581141902001.
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