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5 October 2015 Next generation organic light-emitting materials and devices (Presentation Recording)
Bernard Kippelen
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Proceedings Volume 9566, Organic Light Emitting Materials and Devices XIX; 956613 (2015) https://doi.org/10.1117/12.2187057
Event: SPIE Organic Photonics + Electronics, 2015, San Diego, California, United States
Abstract
In this talk, we will discuss recent innovations in organic light-emitting materials and devices. First, we will report on organic light-emitting diodes (OLEDs) based on thermally activated delayed fluorescence (TADF). We will show that devices based on the emitter 4CzIPN doped in a novel ambipolar host can yield a current efficacy of 81 cd/A and a maximum external quantum efficiency of 26.5%. These devices exhibit a low turn-on voltage of 3.2 V at 10 cd/m2, as well as reduced efficiency roll-off at high current densities. The performance of these devices is comparable to that of electrophosphorescent devices based on organic-metallic compounds that contain precious metals such as Iridium. In a second part we will report on highly efficient green-emitting organic light-emitting diodes (OLEDs) fabricated on shape memory polymer (SMP) substrates for flexible electronic applications. SMPs are a class of mechanically active materials that can change and store shape upon activation by a stimulus. The combination of the unique properties of SMP substrates with the light-emitting properties of OLEDs pave to the way for new applications, including conformable smart skin devices, minimally invasive biomedical devices, and flexible lighting/display technologies. Finally, we will present OLEDs fabricated on substrates made from cellulose nanocrystals (CNC) and discuss how such substrates can reduce the environmental footprint of printable organic electronics.
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Bernard Kippelen "Next generation organic light-emitting materials and devices (Presentation Recording)", Proc. SPIE 9566, Organic Light Emitting Materials and Devices XIX, 956613 (5 October 2015); https://doi.org/10.1117/12.2187057
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KEYWORDS
Organic light emitting diodes
Biomedical optics
External quantum efficiency
Flexible circuits
Iridium
Luminescence
Metals
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