Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO24)
Publication date: 25th April 2024
State-of-the-art display screens are only for information display, while a range of extra different sensors are integrated into the screens for additional functions such as touch control, ambient light sensing, and fingerprint sensing. Future ultra-thin and large screen-to-body ratio screens require the development of novel multifunctional light-emitting diodes (LEDs), which both display information and sense signals - a feature hardly possible for conventional LED technologies. [1]
Here, we develop multifunctional displays using highly photo-responsive metal halide perovskite LEDs (PeLEDs) as pixels following our previous publication. [2] With efficient defects passivation within perovskite layers, the red emissive PeLEDs shows an external quantum efficiency (EQE) of 10% when working at LED model and a power conversion efficiency (PCE) of 5.34% at photovoltaic model. Due to the strong photo response of the PeLED pixels, the display can be simultaneously used as touch screen, fingerprint sensor, ambient light sensor, and image sensor without integrating any additional sensors. In addition, decent light-to-electricity conversion efficiency of the pixels also enables the display to act as a photovoltaic device which can charge the equipment. [3] The multiple-functions of our PeLED pixels can not only simplify the display module structure and realize ultra-thin and light-weight display, but also significantly enhance the user experience by these advanced new applications. As such, our results demonstrate great potential of PeLEDs for a new generation of displays for future electronic devices.
[1] Oh et al., Science 355, 616–619 (2017)
[2] Yuan, Z. et al., Joule 6, 2423-2436, (2022).
[3] Bao, C.#, Yuan, Z.#, et al., Nat. Electronics, just accepted (# contribute equally).
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