Blue fluorescent OLEDs are still the bottleneck for the power consumption in today´s OLED panels. In recent years, the TADF technology has shown fast progress towards high-efficiency deepblue emitter systems. The TADF technology can be used in a selfemitting or in a co-emitting (or hyper) approach. To make the coemitting system work efficiently, the combination of TADF and fluorescent emitter has to be chosen carefully. In this paper, we will discuss how to match TADF and fluorescent emitter combinations for the co-emitting approach. We will also show results for highly efficient deep-blue hyper-fluorescent devices.

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The missing high-efficiency Blue OLEDs are still the bottleneck for the power consumption in today´s OLED panels. One way to improve the efficiency of the blue pixel is the use of narrow-type fluorescent emitters in a classical fluorescent stack for topemission OLED devices where the optical cavity effect favors narrow over a broader emission. In this paper, we will show how narrow-type fluorescent emitters can deliver >30% efficiency improvement over traditional commercial fluorescent blue emitters to reach >200 cd/A/CIEy in top-emission devices. For further efficiency increase, those fluorescent emitters can be combined with TADF emitters which can increase the internal quantum efficiency from 25% to 100%. In order to make such a hyper-fluorescent system work efficiently, the combination of TADF and fluorescent emitter has to be chosen carefully as they have to match the materials perfectly.

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