This work intends to address the root cause of light trapping that is intrinsic in traditional OLED devices. We systematically analyzed OLEDs made with an ultrathin Ag anode and found that waveguide modes can be completely eliminated by designing a structure to below the cutoff thickness of waveguide modes. Experimental demonstration was performed. We also experimentally verified the waveguide mode elimination in organic waveguides. In principle such a scheme can be extended to tandem cells, and in making transparent OLED. A further benefit is the ductility of the ultrathin metal allows foldable OLED to be realized.
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