Yen Meng-Cheng, Lee Chia-Jung, Liu Kang-Hsiang, Peng Yi, Leng Junfu, Chang Tzu-Hsuan, Chang Chun-Chieh, Tamada Kaoru, Lee Ya-Ju
Institute of Electro-Optical Engineering, National Taiwan Normal University, Taipei, Taiwan.
Institute for Materials Chemistry and Engineering (IMCE), Kyushu University, Fukuoka, Japan.
Nat Commun. 2021 Jul 22;12(1):4460. doi: 10.1038/s41467-021-24762-w.
Field-induced ionic motions in all-inorganic CsPbBr 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/CsPbBr/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.
全无机CsPbBr钙钛矿量子点（QDs）中的场致离子运动不仅强烈决定其电光特性，还决定最终的光电器件性能。在此，我们展示了通过简单地调制偏置极性，单个Ag/CsPbBr/ITO器件的功能可以在亚毫秒尺度上从电阻式随机存取存储器（RRAM）主动切换为发光电化学电池（LEC），反之亦然。然后，我们首次通过将两个相同的器件串联配对，实现了一个在5kHz下运行的快速、全钙钛矿发光存储器（LEM），其中一个用作RRAM来电读取编码数据，而另一个同时用作LEC进行并行、非接触光学读取。我们进一步表明，可以从其发射颜色实时感知LEM的数字状态。我们的工作为更先进的全无机钙钛矿光电子技术开辟了全新的视野。
