A high linearity organic all-optical synapse thin film, a preparation method thereof, a synapse device, and an optical dose sensing system
By employing TPP/BINN/PMMA blended thin film materials, the nonlinear response problem of organic all-optical synaptic devices was solved, achieving high linearity and stable optical response, improving the accuracy and reliability of neuromorphic computing systems, and making them suitable for optical dose sensing systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- UNIV OF CHINESE ACAD OF SCI
- Filing Date
- 2026-01-19
- Publication Date
- 2026-06-09
AI Technical Summary
The nonlinear response and poor uniformity of existing organic all-optical synaptic devices limit their application in high-precision neuromorphic systems, especially introducing errors in scenarios such as precise optical dose sensing and high dynamic range visual sensing.
A high-linearity organic all-optical synaptic device was fabricated and a photodose sensing system was constructed by using a polymethyl methacrylate (PMMA) blend film material doped with triphenylphosphine (TPP) and N,N-dimethyl-1,1-bis(naphthyl)diamine (BINN) to achieve a high-linearity photoresponse through photophysical processes.
It achieves high linearity and stability in optical response, improves the accuracy and reliability of neuromorphic computing systems, reduces energy consumption, and is suitable for large-scale production and application.
Smart Images
Figure CN122167928A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of neuromorphic computing and artificial intelligence hardware technology, specifically to an organic optoelectronic device for simulating biological synaptic function, and more particularly to an organic all-optical synaptic thin film material with high linearity response characteristics, its preparation method, a synaptic device based on the thin film, and an optical dose sensing system integrating the device. Background Technology
[0002] The rapid development of artificial intelligence has placed higher demands on the energy efficiency and power consumption of information processing hardware. Neuromorphic computing, by simulating the structure and working mechanism of biological nervous systems, provides a promising technical path for achieving efficient and low-power parallel information processing. In this system, synapses, as key nodes for interneuronal connections and signal modulation, have biomimetic devices whose performance directly determines the computational accuracy, energy efficiency, and reliability of the entire system. Especially in tasks such as image processing and pattern recognition, the linearity and consistency of synaptic weight updates are crucial.
[0003] In recent years, organic all-optical synapses have become a research hotspot due to their ability to write and read signals purely optically, avoiding crosstalk and losses inherent in electrical interconnects. They exhibit low power consumption, high speed, and potential for integration with flexible electronics and biological systems. However, most reported organic all-optical synaptic devices rely primarily on photoisomerization or photochemical reactions for their operation. The inherent nonlinearity of these physicochemical processes leads to a nonlinear relationship between the device response—the change in synaptic weights—and the input optical signal, resulting in poor update linearity, low device uniformity, and insufficient cyclic stability. This limits their application in neuromorphic systems requiring high-precision, high-fidelity simulation calculations. For example, in scenarios such as precise optical dose sensing and high dynamic range visual sensing, nonlinear responses directly introduce errors, reducing the system's sensing accuracy and recognition reliability.
[0004] Therefore, developing organic all-optical synaptic devices with high linearity, high consistency, and stable response is a core challenge in overcoming current technological bottlenecks and achieving high-performance neuromorphic optical sensing and computing. Furthermore, constructing integrated optical signal sensing and processing systems based on such devices is of great significance for promoting the practical application of neuromorphic hardware in fields such as robot vision and intelligent sensing. Summary of the Invention
[0005] To address the shortcomings of existing organic all-photosynapses based on photochemical reactions, such as nonlinear response and poor uniformity, this invention aims to provide a novel material system and device architecture. Specifically, the objective is:
[0006] 1. An organic blend film with high linearity photoresponse characteristics is provided, wherein the luminescence intensity can be linearly and predictably accumulated with the incident light dose.
[0007] 2. A simple and controllable method for preparing the above-mentioned thin film is provided.
[0008] 3. A high-linearity organic all-optical synaptic device based on this thin film is provided.
[0009] 4. A light dose sensing system integrating the synaptic device is provided to achieve accurate quantitative sensing of light signals.
[0010] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0011] In a first aspect, the present invention provides a high-linearity organic all-photosynthetic glassy blend film, which is composed of a host material, a guest material and a polymer matrix.
[0012] The main material is triphenylphosphine (TPP).
[0013] The guest material is N,N-dimethyl-1,1-bis(naphthyl)diamine (BINN).
[0014] The polymer matrix is polymethyl methacrylate (PMMA).
[0015] Preferably, the doping amount of N,N-dimethyl-1,1-bis(naphthyl)diamine (BINN) is 0.1% to 2% of the molar amount of triphenylphosphine (TPP). More preferably, the doping amount is 0.5% of the molar amount of triphenylphosphine (TPP).
[0016] Preferably, the total mass of the host material and the guest material accounts for 15 wt% to 35 wt% of the total mass of the host material, the guest material and the polymer matrix.
[0017] Secondly, the present invention provides a method for preparing the above-mentioned high linearity organic all-photosynthetic glassy blend film, comprising the following steps:
[0018] S1: Weigh the host material, guest material and polymer matrix in proportion, dissolve them together in an organic solvent such as dichloromethane, stir until completely dissolved and mixed evenly to obtain a clear film-forming solution.
[0019] S2: The film-forming solution is coated onto a clean substrate, such as a quartz plate, glass, or silicon wafer, by spin coating, blade coating, or drop coating to form a wet film.
[0020] S3: Allow the solvent in the wet film to fully evaporate under room temperature or moderate heating conditions to obtain a solid initial film.
[0021] S4: The initial film is placed on a hot table or in an oven for heat treatment, and then naturally cooled to room temperature to finally form a uniform, transparent glassy blend film. Preferably, the heat treatment temperature is 150°C to 190°C, and the time is 3 to 10 minutes.
[0022] Thirdly, the present invention provides a high linearity organic all-optical synaptic device, wherein the core functional layer comprises the glassy blend film described in the first aspect or the glassy blend film prepared by the method described in the second aspect.
[0023] When this synaptic device is excited by a sequence of ultraviolet light pulses of a specific wavelength, for example, in the range of 340 nm to 390 nm, the intensity of its photoluminescence exhibits a highly linear positive correlation with the cumulative dose of the received light pulses. Preferably, the pulse width of a single light pulse is 0.1 seconds to 2 seconds.
[0024] Fourthly, the present invention provides a light dose sensing system, comprising:
[0025] Optical signal input unit: used to generate and provide modulated or unmodulated optical signals to be sensed.
[0026] The high linearity organic all-optical synaptic device described in the third aspect serves as the sensing and processing core of the system, receiving optical signals from the optical signal input unit and generating a linearly related luminescent response.
[0027] Photoelectric conversion unit: such as photodiode or photomultiplier tube, used to detect the light emission response intensity of the synaptic device in real time and convert it into a corresponding analog or digital electrical signal.
[0028] Signal processing and display unit: Used to receive and process electrical signals from the photoelectric conversion unit. This unit may include a microcontroller, whose built-in algorithm quantizes the continuous response signal into several discrete light dose levels, and transmits the level information through communication modules such as Bluetooth and Wi-Fi and displays it on the graphical interface of terminal devices such as mobile phones and computers, thereby realizing intuitive and quantitative perception of incident light dose.
[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0030] 1. This invention creatively employs a TPP:BINN / PMMA host-guest doping system, whose photophysical process avoids the strong nonlinearity of traditional photochemical reactions, and achieves high linearity and high fidelity mapping of luminescence intensity to light input dose, which is crucial for building a high-precision neuromorphic computing system.
[0031] 2. The organic all-optical synapse prepared by this invention has excellent synaptic response linearity, low energy consumption, and can achieve high-precision, high-resolution optical dose quantification sensing.
[0032] 3. The synaptic device of the present invention has a simple fabrication process, low cost, and sensitive photoresponse, making it suitable for large-scale production and application.
[0033] 4. The optical dose sensing system constructed in this invention integrates information sensing, storage and processing functions. It has a compact structure, is easy to carry, and adopts an all-optical signal transmission and processing mechanism, which can effectively avoid electrical noise interference and improve the system signal-to-noise ratio and stability. Attached Figure Description
[0034] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.
[0035] Figure 1 This is a schematic diagram of the molecular structure of triphenylphosphine (TPP), the host material, and N,N-dimethyl-1,1-bis(naphthyl)diamine (BINN), the guest material selected in this invention.
[0036] Figure 2 This is a schematic diagram of the preparation process of the organic all-photosynthetic film in an embodiment of the present invention;
[0037] Figure 3 This is a graph showing the luminescence response of the organic all-optical synaptic device under different numbers of light pulses in the embodiments of the present invention, illustrating the linear relationship between response intensity and pulse number;
[0038] Figure 4 This is a graph showing the luminescence response of the organic all-optical synaptic device under different frequency light pulse stimulation in the embodiments of the present invention;
[0039] Figure 5 This is a graph showing the luminescence response of the organic all-optical synaptic device under different intensity light pulse stimulation in the embodiments of the present invention;
[0040] Figure 6 This is a diagram of the dual-pulse facilitation index of the organic all-optical synaptic device in this embodiment of the invention;
[0041] Figure 7 This is a diagram showing the energy consumption calculation of the organic all-optical synaptic device in an embodiment of the present invention;
[0042] Figure 8 This is a hardware architecture block diagram of the optical dose sensing system described in this invention. Specific implementation methods
[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Unless otherwise specified, the reagents, materials, and instruments used in this invention are commercially available.
[0044] Example 1: Preparation of high-linearity organic all-photosynthetic glassy blend films
[0045] (1) Take 1.0 g of TPP:BINN powder with trace doping (0.5 mol%) and 3.0 g of polymethyl methacrylate, add them together to dichloromethane (8.0 mL), and stir and mix at room temperature to prepare the coating. The mass fraction of host-guest dopant in the coating is 25% (excluding solvent).
[0046] (2) 500 microliters of coating were spin-coated onto a quartz substrate. After the dichloromethane evaporated, a non-vitrified polymer blend film with a size of 2×2 cm and a thickness of 30 micrometers was obtained. The film was then placed on a heating platform and treated at 170°C for 5 minutes, and then cooled to room temperature. Finally, a smooth, uniform, and transparent glassy blend film was obtained on the quartz plate.
[0047] Example 2: Performance Testing of High-Linearity Organic All-Optical Synaptic Devices
[0048] The quartz sheet with thin film prepared in Example 1 was used as the test device.
[0049] (1) The effect of the number of light pulses on the modulation of the device's luminous intensity was tested. A fixed intensity of 13.8 mW / cm was applied to the device. 2 The luminescence intensity of the device was measured under 365 nm ultraviolet light pulses of different pulse widths. (Ultraviolet light, 365 nm, 13.8 mW / cm²) 2 Below, such as Figure 3 As shown, as the number of pulses increased from 10 to 50, the luminous intensity of the device increased from 1434 a.u. to 5331 a.u. Furthermore, the device returned to its initial state more quickly after the illumination was removed; the more pulses, the longer the device took to return to its initial state. This corresponds to the transition of biological synapses from short-term to long-term memory.
[0050] (2) The effect of light pulse frequency on the modulation of the device's luminous intensity was tested. A fixed intensity of 13.8 mW / cm was applied to the device. 2 The luminescence intensity of the device was measured under different 365 nm ultraviolet light pulses of varying frequencies. (Ultraviolet light at 365 nm, 13.8 mW / cm²) 2 Below, such as Figure 4As shown, as the pulse frequency increases from 1 Hz to 5 Hz, the luminous intensity of the device decreases from 1560 a.u. to 982 au.
[0051] (3) Test the effect of light intensity on the modulation of device luminescence intensity. Apply a fixed 0.5 s ultraviolet light pulse of 365 nm with different light intensities to the device and test the change in device luminescence intensity. Under ultraviolet light (365 nm, 0.5 s), as Figure 5 As shown, with the light intensity increasing from 13.8 mW / cm², 2 Up to 25.6 mW / cm 2 The luminous intensity of the device increased from 2433 au to 3152 au.
[0052] (4) Test the light-induced paired pulse facilitation characteristics. Apply two consecutive light pulses to the device, keep the pulse width constant, and observe the change in the ratio of the two response amplitudes by varying the time interval. Figure 6 As shown, it can be observed that the ratio of response amplitude decreases as the pulse interval increases, which can simulate the paired pulse facilitation characteristics of organisms.
[0053] (5) Test the minimum light power consumption of the device. Apply ultraviolet light to the device as low a power as possible and make the light spot as small as possible. The required light power consumption can be calculated by multiplying the light power by the illumination time by the light spot area.
[0054] Example 3: Construction of an optical dose sensing system
[0055] The fabricated high-linearity organic all-optical synapse is connected to a green-light selective photodetector. The detector transmits the light intensity emitted by the device to a microcontroller (STM32), which divides the illuminance into five levels. These levels are then transmitted to a mobile phone via Bluetooth for display. When the organic all-optical synapse is continuously irradiated with ultraviolet light, its luminous intensity increases over time. The light intensity sensed by the photodetector also increases, and the microcontroller classifies it into a higher level, thus achieving the sensing of light dose.
[0056] Figure 8 This is a hardware architecture block diagram of the optical dose sensing system described in this invention. The system consists of two parts: a sensing and processing unit and a power management unit. The sensing unit uses an all-optical synapse as its core. Its response optical signal is converted by a photodetector, acquired and processed by a microcontroller ADC, and finally sent to a mobile terminal for display via Bluetooth, realizing the entire process of optical signal sensing, conversion, processing, and wireless transmission. The power unit is powered by a lithium battery, which provides stable power to each unit through a battery management and LDO voltage regulator module, and is charged via a USB interface. This block diagram clearly demonstrates the highly integrated, low-power, and portable characteristics of the system of this invention.
[0057] The specific descriptions in the above examples further illustrate the purpose, technical solution, and beneficial effects of the invention. These descriptions are merely specific embodiments of the present invention, used to explain the technical solution and not to limit the scope of the claims. Therefore, the scope of protection of this patent should be determined by the appended claims.
Claims
1. A high-linearity organic all-optical synaptic glassy blend film, characterized in that, It consists of a host material, a guest material, and a polymer matrix; The main material is triphenylphosphine; The guest material is N,N-dimethyl-1,1-bis(naphthyl)diamine; The polymer matrix is polymethyl methacrylate.
2. The high linearity organic all-optical synaptic glassy blend film according to claim 1, characterized in that, The doping amount of the N,N-dimethyl-1,1-bis(naphthyl)diamine is 0.1% to 2% of the molar amount of triphenylphosphine.
3. The high linearity organic all-optical synaptic glassy blend film according to claim 2, characterized in that, The doping amount of the N,N-dimethyl-1,1-bis(naphthyl)diamine is 0.5% of the molar amount of triphenylphosphine.
4. The high linearity organic all-optical synaptic glassy blend film according to any one of claims 1-3, characterized in that, The total mass of the host material and the guest material accounts for 15 wt% to 35 wt% of the total mass of the host material, the guest material and the polymer matrix.
5. A method for preparing a high-linearity organic all-photosynthetic glassy blend film according to any one of claims 1-4, characterized in that, Includes the following steps: S1: Dissolve the host material, guest material and polymer matrix in an organic solvent, mix them evenly to obtain a film-forming solution; S2: The film-forming solution is coated onto the substrate to form a wet film; S3: Evaporate the solvent in the wet film to obtain the initial film; S4: The initial film is heat-treated and then cooled to form the glassy blend film.
6. The preparation method according to claim 5, characterized in that, In step S4, the heat treatment temperature is 150°C to 190°C, and the time is 3 to 10 minutes.
7. A high-linearity organic all-optical synaptic device, characterized in that, Includes the glassy blend film according to any one of claims 1-4 or the glassy blend film prepared by the method of claim 5 or 6; When the synaptic device is excited by light pulses with wavelengths ranging from 340 nm to 390 nm, the intensity of its photoluminescence increases linearly with the cumulative dose of the received light pulses.
8. The high linearity organic all-optical synaptic device according to claim 7, characterized in that, The pulse width of the light pulse is 0.1 seconds to 2 seconds.
9. A light dose sensing system, characterized in that, include: An optical signal input unit is used to provide the optical signal to be sensed; The high linearity organic all-optical synaptic device as described in claim 7 or 8 is used to receive the optical signal and generate a linearly correlated luminescent response; A photoelectric conversion unit is used to detect the light emission response of the synaptic device and convert it into an electrical signal; The signal processing and display unit is used to process the electrical signal and output the sensing results related to the input light dose.
10. The optical dose sensing system according to claim 9, characterized in that, The signal processing and display unit includes a microcontroller and a communication module. The microcontroller is used to quantize the electrical signal into different light dose levels and send the level information to the terminal device for display through the communication module.