Color-Tunable, Spectra-Stable Flexible White Top-Emitting Organic Light-Emitting Devices Based on Alternating Current Driven and Dual-Microcavity Technology

Abstract

White top-emitting organic light-emitting diodes (TOLEDs) are attractive due to their freedom of choice in substrates. However, tunable color and stable spectra for white TOLED remain considerable challenges. Here, we conceive a novel, in-planar-electrodes, dual-microcavity OLED driven by alternating current signals to build white TOLEDs. Consequently, the microcavity effect in the dual-microcavity OLED can be separately optimized for blue and yellow emissive units. The color temperature of the device also can be adjusted by using alternating current signals. We finally achieve color-tunable, spectra-stable, flexible, white TOLEDs on polyethylene terephthalate (PET) substrate and paper substrate. This work will be beneficial to the further development of white, top-emitting devices, even including quantum dots LEDs and perovskite LEDs.

Efficient Surface Plasmon Polariton Excitation and Control over Outcoupling Mechanisms in Metal–Insulator–Metal Tunneling Junctions

“…This research confirms the efficiency of MIM‐TJs as on‐chip SPP sources. Therefore we believe that MIM‐TJs, especially when combined with optical elements such as gratings,65 antennas,66 or waveguides,17 are potentially interesting candidates for applications in sensing and opto‐electronics.…”

Pyrazolo[1,5-a]pyrimidines-based fluorophores: a comprehensive theoretical-experimental study

“…Fluorescent organic compounds have been a major focus of research related to materials science and biological interactions over the past decades. 1 Ranging from ionic or molecular sensing 2 to bioimaging applications 3 and, from the organic light-emitting devices, 4 bio-macromolecular interactions. 5 A plethora of applications has been proposed by exploiting the benecial properties of such materials that can raise our standard of living.…”

Flexible organic optoelectronic devices on paper

“…The buffer layer can simultaneously reduce roughness and improve waterproof performance. A dual-microcavity top-emitting OLEDs (DMT-OLEDs) based on paper substrates have been fabricated by Xie's group ( Figure 9 A)( Zhang et al., 2019b ). A cross-linked poly(4-vinylphenol) layer is deposited by spin coating and subsequently cross-linked at 160°C for 2 h, the PVP layer act as a buffer.…”

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Figure 9 The performance and schematic diagram of OLEDs (A) Pictures of DMT-OLEDs based on paper substrates. Adapted with permission from ( Zhang et al., 2019b ). Copyright 2019, American Chemical Society.

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