A solution-processed trilayer electrochemical device: localizing the light emission for optimized performance |
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Authors: | Shi Tang Andreas Sandström Junfeng Fang Ludvig Edman |
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Institution: | The Organic Photonics and Electronics Group, Ume? University , SE-901 87 Ume?, Sweden. |
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Abstract: | We present a solution-processed trilayer light-emitting device architecture, comprising two hydrophobic and mobile-ion-containing "transport layers" sandwiching a hydrophilic and ion-free "intermediate layer", which allows for lowered self-absorption, minimized electrode quenching, and tunable light emission. Our results reveal that the transport layers can be doped in situ when a voltage is applied, that the intermediate layer as desired can contribute significantly to the light emission, and that the key to a successful operation is the employment of a porous and (~5-10 nm) thin intermediate layer allowing for facile ion transport. We report that such a solution-processed device, comprising a thick trilayer material (~250 nm) and air-stable electrodes, emits blue light (λ(peak) = 450, 484 nm) with high efficiency (5.3 cd/A) at a low drive voltage of 5 V. |
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