Visual optical information encryption–decryption and anti‐counterfeiting (IEDAC) technology play a vital role in the field of information security. Recent luminescent information encryption technologies face the disadvantages of depending on external large‐scale stimulus decryption equipment, inability to read out repeatedly, and information leakage, impeding the practical applications of luminescence encryption. Here, an integrated luminescent IEDAC chip is proposed, which provides a convenient approach to store and decipher pre‐patterned luminescence information based on laser engraved template and film heater. The luminescent encryption chip contains a double‐layer structure made up of long persistent phosphors based on SrCaGa4O8 host and a laser induced graphene heater, which makes it possible to decrypt information on a single chip. This design enables dual‐mode (photoluminescence/long persistent luminescence), dual‐color (blue/yellow‐green), and multi‐level IEDAC function, providing a novel insight and integrated strategy for implementing advanced IEDAC technologies.
Human–machine
interaction (HMI) systems are widely used
in the healthcare field, and they play an essential role in assisting
the rehabilitation of patients. Currently, a large number of HMI-related
research studies focus on piezoresistive sensors, self-power sensors,
visual and auditory receivers, and so forth. These sensing modalities
do not possess high reliability with regard to breathing condition
detection. The humidity signal conveyed by breathing provides excellent
stability and a fast response; however, humidity-based HMI systems
have rarely been studied. Herein, we integrate a humidity sensor and
a graphene thermoacoustic device into a humidity-based HMI system
(HHMIS), which is capable of monitoring respiratory signals and emitting
acoustic signals. HHMIS has a practical value in healthcare to assist
patients. For example, it works as a prewarning system for respiratory-related
disease patients with abnormal respiratory rates, and as an artificial
throat device for aphasia patients. Achieved based on a laser direct
writing technology, this wearable device features low cost, high flexibility,
and can be prepared on a large scale. This portable non-contact HMMIS
has broad application prospects in many fields such as medical health
and intelligent control.
A resistive switching behaviour of printed, flexible Cu/CuO/(AgO)/Ag memristor devices is demonstrated for the first time. It is suggested that the high resistance state and low resistance state of bipolar resistive switching behaviour are governed by the migration of oxygen between the copper oxide and silver oxide layers. The devices have characteristics of inexpensive low-temperature fabrication, low-power operation and no required electroforming process. Ink-jet printing was used to fabricate the devices on polymer substrates. Since these devices are fabricated on flexible polyimide, they have compatibility with flexible electronic technologies.
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