4.8 Article

Multimodal Tuning of Synaptic Plasticity Using Persistent Luminescent Memitters

Journal

ADVANCED MATERIALS
Volume 34, Issue 25, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202101895

Keywords

image memorization; persistent luminescence; photonic memory; synaptic plasticity

Funding

  1. Ministry of Education, Singapore [MOE2017-T2-2-110]
  2. Agency for Science, Technology, and Research (A*STAR) under its AME program [A1883c0011, A1983c0038]
  3. National Research Foundation, the Prime Minister's Office of Singapore [NRF-NRFI05-2019-0003]
  4. King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) [OSR-2018-CRG7-3736]
  5. National Natural Science Foundation of China [21771135, 21871071]
  6. FCT/MEC [UIDB/50011/2020, UIDP/50011/2020]
  7. FEDER under the PT2020 Partnership Agreement

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By utilizing a special class of memristive materials based on persistent luminescent emitters, memory processes and synaptic plasticity can be effectively simulated. These memory materials with optical characteristics allow for direct observation of subtle changes in luminescence intensity.
Mimicking memory processes, including encoding, storing, and retrieving information, is critical for neuromorphic computing and artificial intelligence. Synaptic behavior simulations through electronic, magnetic, or photonic devices based on metal oxides, 2D materials, molecular complex and phase change materials, represent important strategies for performing computational tasks with enhanced power efficiency. Here, a special class of memristive materials based on persistent luminescent memitters (termed as a portmanteau of memory and emitter) with optical characteristics closely resembling those of biological synapses is reported. The memory process and synaptic plasticity can be successfully emulated using such memitters under precisely controlled excitation frequency, wavelength, pulse number, and power density. The experimental and theoretical data suggest that electron-coupled trap nucleation and propagation through clustering in persistent luminescent memitters can explain experience-dependent plasticity. The use of persistent luminescent memitters for multichannel image memorization that allows direct visualization of subtle changes in luminescence intensity and realization of short-term and long-term memory is also demonstrated. These findings may promote the discovery of new functional materials as artificial synapses and enhance the understanding of memory mechanisms.

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