All-inorganic perovskite quantum dot light-emitting memories

Meng-Cheng Yen, Chia-Jung Lee, Kang-Hsiang Liu, Yi Peng, Junfu Leng, Tzu-Hsuan Chang, Chun-Chieh Chang (), Kaoru Tamada () and Ya-Ju Lee ()
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Meng-Cheng Yen: National Taiwan Normal University
Chia-Jung Lee: National Taiwan Normal University
Kang-Hsiang Liu: National Taiwan Normal University
Yi Peng: National Taiwan Normal University
Junfu Leng: Kyushu University
Tzu-Hsuan Chang: National Taiwan University
Chun-Chieh Chang: National Taiwan Normal University
Kaoru Tamada: Kyushu University
Ya-Ju Lee: National Taiwan Normal University

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract Field-induced ionic motions in all-inorganic CsPbBr3 perovskite quantum dots (QDs) strongly dictate not only their electro-optical characteristics but also the ultimate optoelectronic device performance. Here, we show that the functionality of a single Ag/CsPbBr3/ITO device can be actively switched on a sub-millisecond scale from a resistive random-access memory (RRAM) to a light-emitting electrochemical cell (LEC), or vice versa, by simply modulating its bias polarity. We then realize for the first time a fast, all-perovskite light-emitting memory (LEM) operating at 5 kHz by pairing such two identical devices in series, in which one functions as an RRAM to electrically read the encoded data while the other simultaneously as an LEC for a parallel, non-contact optical reading. We further show that the digital status of the LEM can be perceived in real time from its emission color. Our work opens up a completely new horizon for more advanced all-inorganic perovskite optoelectronic technologies.

Date: 2021
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DOI: 10.1038/s41467-021-24762-w

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