CN-115241377-B - Flexible near-infrared artificial retina device and preparation method thereof

Abstract

The invention discloses a flexible near-infrared artificial retina device and a preparation method thereof. The flexible near-infrared type artificial retina device comprises a flexible substrate, a bottom electrode formed on the flexible substrate, a functional layer, a top transparent electrode formed on the functional layer, and a near-infrared transparent electrode, wherein the functional layer comprises an organic ferroelectric polymer film/rare earth up-conversion nano material/organic ferroelectric polymer film laminated structure and is formed on the bottom electrode, the top transparent electrode is formed on the functional layer and is used for exciting the device by near-infrared light, the near-infrared light signal is converted into a reproducible visible light signal by utilizing the anti-Stokes light emitting capability of the rare earth up-conversion nano material, the acquisition and signal reproduction functions of near-infrared band light information are completed, and meanwhile, the near-infrared information processing and memorizing are realized by utilizing a continuously adjustable nonvolatile resistance state, so that the simulation of the artificial retina function is finally realized.

Inventors

• WANG TIANYU
• MENG JIALIN
• CHEN LIN
• SUN QINGQING
• ZHANG WEI

Assignees

• 复旦大学

Dates

Publication Date

20260508

Application Date

20220804

Claims (10)

1. 1. A flexible near-infrared artificial retina device is characterized in that, Comprising the following steps: A flexible substrate; A bottom electrode formed on the flexible substrate; A functional layer including an organic ferroelectric polymer thin film/rare earth up-conversion nanomaterial/organic ferroelectric polymer thin film stack structure formed on the underlying electrode; A top transparent electrode formed on the functional layer, The near infrared light is used for exciting the device, the anti-Stokes light emitting capability of the rare earth up-conversion nano material is used for converting a near infrared light signal into a reproducible visible light signal, the functions of collecting near infrared band light information and reproducing the signal are completed, meanwhile, the continuously adjustable nonvolatile resistance state is used for realizing the processing and memory of the near infrared information, and finally, the simulation of the artificial retina function is realized.
2. 2. The flexible near infrared type artificial retina device as claimed in claim 1, wherein, The organic ferroelectric polymer film is P (VDF-TrFE).
3. 3. The flexible near infrared type artificial retina device as claimed in claim 1, wherein, The rare earth up-conversion nano material is NaYF 4 :Yb 3+ ,Er 3+ .
4. 4. The flexible near infrared type artificial retina device as claimed in claim 1, wherein, The top transparent electrode is ITO, FTO, ZTO or AZO.
5. 5. The flexible near infrared type artificial retina device as claimed in claim 1, wherein, The flexible substrate is flexible glass, PET, PEN, PI or PDMS.
6. 6. A method for preparing a flexible near-infrared artificial retina device is characterized in that, The method comprises the following steps: Forming a bottom electrode on a flexible substrate; forming an organic ferroelectric polymer film/rare earth up-conversion nano material/organic ferroelectric polymer film laminated structure on the bottom electrode as a functional layer; A top transparent electrode is formed on the functional layer, The near infrared light is used for exciting the device, the anti-Stokes light emitting capability of the rare earth up-conversion nano material is used for converting a near infrared light signal into a reproducible visible light signal, the functions of collecting near infrared band light information and reproducing the signal are completed, meanwhile, the continuously adjustable nonvolatile resistance state is used for realizing the processing and memory of the near infrared information, and finally, the simulation of the artificial retina function is realized.
7. 7. The method of manufacturing a flexible near infrared type artificial retina device as claimed in claim 6, wherein, The organic ferroelectric polymer film is P (VDF-TrFE).
8. 8. The method of manufacturing a flexible near infrared type artificial retina device as claimed in claim 6, wherein, The rare earth up-conversion nano material is NaYF 4 :Yb 3+ ,Er 3+ .
9. 9. The method of manufacturing a flexible near infrared type artificial retina device as claimed in claim 7, wherein, Coating a P (VDF-TrFE) organic ferroelectric polymer by adopting a spin coating method, and spin-coating for 30-120 s at a speed of 1000-3000 rpm by using a spin coater after the coating is fully paved; And then annealing for 1-6 hours at the temperature of 60-150 ℃ in a nitrogen atmosphere by utilizing a tube furnace to obtain the P (VDF-TrFE) organic ferroelectric polymer film.
10. 10. The method of manufacturing a flexible near infrared type artificial retina device as claimed in claim 8, wherein, Spin-coating NaYF 4 :Yb 3+ ,Er 3+ rare earth up-conversion nano material on the organic ferroelectric polymer film, wherein the spin-coating rotating speed is 1000-3000 rpm, and the spin-coating time is 30-120 s; and then baking for 10-60 minutes at the temperature of 60-150 ℃ in a nitrogen atmosphere by utilizing a tube furnace.

Description

Flexible near-infrared artificial retina device and preparation method thereof Technical Field The invention relates to the technical field of semiconductors, in particular to a flexible near-infrared artificial retina device and a preparation method thereof. Background The human visual system plays an important role in collecting external environment information, can quickly sense optical signals and convert the optical signals into electrical signals for further processing, and has the advantages of high efficiency, low power consumption and the like. Wherein, retina is a core component in vision system, plays a key role in realizing the functions of optical information identification, memory, etc. The artificial retina is constructed by utilizing the electronic device, and has important significance for developing a high-performance bionic vision system. The near infrared light covers the wave band of 780 nm-2526 nm, is rich in important information of substances, and can be used for qualitatively or quantitatively analyzing the substance components. However, the human eyes can only observe the optical information in the visible light wave band (400-780 nm), and hardly respond to the infrared wave band, so that the infrared information can be realized only by means of auxiliary electronic devices, and the functionality of the human eyes is limited. Therefore, in order to solve the problem, the development of the bionic retina with near infrared band response has great application potential. The organic polymer ferroelectric material can generate stable ferroelectric phase transition under the stimulation of voltage, thereby realizing the memory regulation of signals and realizing the simulation of visual memory functions. However, the organic polymer ferroelectric material is difficult to respond to the optical excitation of the near infrared band, and the application of the organic polymer ferroelectric material to the bionic retina construction of the near infrared band is limited. The traditional integrated circuit devices are all based on a hard silicon-based substrate, and have the problems of difficult bending, easy breaking, limited application scene and the like. The flexible electronic equipment is rapidly developed with the advantages of being wearable, bending-resistant, stretchable, light in weight, portable, strong in impact resistance and the like, and has obvious advantages compared with silicon-based devices in special demand scenes. Because of the three-dimensional spherical structure of the human eye and the curved surface, the preparation of flexible artificial retinal devices is critical for their practical use. Disclosure of Invention The invention discloses a flexible near-infrared type artificial retina device which comprises a flexible substrate, a bottom electrode formed on the flexible substrate, a functional layer, a top transparent electrode and a bottom transparent electrode, wherein the functional layer comprises an organic ferroelectric polymer film/rare earth up-conversion nano material/organic ferroelectric polymer film laminated structure formed on the bottom electrode, the top transparent electrode is formed on the functional layer, the device is excited by near-infrared light, the near-infrared light signal is converted into a reproducible visible light signal by utilizing the anti-Stokes light emitting capability of the rare earth up-conversion nano material, the acquisition and signal reproduction functions of near-infrared band light information are completed, and meanwhile, the processing and the memory of the near-infrared information are realized by utilizing a continuously adjustable nonvolatile resistance state, so that the simulation of the artificial retina function is finally realized. In the flexible near infrared artificial retina device of the present invention, it is preferable that the organic ferroelectric polymer thin film is P (VDF-TrFE). In the flexible near infrared artificial retina device of the invention, preferably, the rare earth up-conversion nanomaterial is NaYF 4:Yb3+,Er3+. In the flexible near infrared artificial retina device of the invention, preferably, the top transparent electrode is ITO, FTO, ZTO, AZO. In the flexible near-infrared artificial retina device of the present invention, preferably, the flexible substrate is flexible glass PET, PEN, PI, PDMS. The invention also discloses a preparation method of the flexible near-infrared type artificial retina device, which comprises the following steps of forming a bottom electrode on a flexible substrate, forming an organic ferroelectric polymer film/rare earth up-conversion nano material/organic ferroelectric polymer film laminated structure on the bottom electrode as a functional layer, forming a top transparent electrode on the functional layer, exciting the device by near-infrared light, converting a near-infrared light signal into a reproducible visible light signal by utilizing ant