| | | | From: I'manoledguy | 7/6/2017 4:35:12 AM |
| of 11702 | | | Organic Light Emitting Materials and Devices XXI
Sunday - Tuesday 6 - 8 August 2017
Extending the lifetime of blue phosphorescent OLEDs (Keynote Presentation)
Paper 10362-20
Time: 8:00 AM - 8:35 AM
Author(s): Stephen R. Forrest, Univ. of Michigan (United States)
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. |
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