Method for determining efficiency degradation of organic light-emitting device

Abstract

The invention provides a method for determining efficiency degradation of an organic light-emitting device, which belongs to the technical field of organic light-emitting devices, and comprises the following steps of: 1, acquiring the type and material property of the organic light-emitting device, and determining a working environment and a use condition; 2, determining the electrical characteristics of the device based on an electrical parameter method; 3, determining the performance parameters of the device according to the electrical characteristics of the organic light-emitting device, and determining the change of an internal excitation mechanism of the device based on a power spectral density method; 4, determining interaction among atoms in device molecules based on a high-precision molecular orbital theory according to the change of an excitation mechanism in the device; and 5, determining related information of the device based on a preset method according to the interaction, and analyzing the related information to determine factors influencing the efficiency degradation of the device. The problems that wrong judgment is caused by human factors, meanwhile, physical behaviors of the device cannot be efficiently understood, the working efficiency of the organic light-emitting device cannot be monitored in real time, and the light-emitting device is seriously degraded are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of organic light-emitting devices, and in particular to a method for determining efficiency degradation of an organic light-emitting device. Background Art

[0002] With the widespread application of organic light-emitting devices, the stability and reliability of their performance have received increasing attention.

[0003] However, the traditional method for determining the efficiency degradation of organic light-emitting devices requires professional technicians to manually observe and analyze the samples, which is easily affected by human factors and may lead to wrong judgments. At the same time, the traditional determination method cannot efficiently understand the physical behavior of the device and cannot monitor the working efficiency of the organic light-emitting device in real time, resulting in more serious degradation of the light-emitting device.

[0004] Therefore, the present invention provides a method for determining efficiency degradation of an organic light emitting device. Summary of the invention

[0005] The present invention provides a method for determining the efficiency degradation of an organic light-emitting device, which is used to solve the problem in the prior art that professional technicians are required to manually observe and analyze samples, which is easily affected by human factors and may lead to wrong judgments. At the same time, the traditional determination method cannot efficiently understand the physical behavior of the device and cannot monitor the working efficiency of the organic light-emitting device in real time, resulting in the defect of more serious degradation of the light-emitting device.

[0006] In one aspect, the present invention provides a method for determining efficiency degradation of an organic light-emitting device, comprising: Step 1: Obtain the type and material properties of the organic light-emitting device, and determine the working environment and use conditions of the organic light-emitting device according to the type and material properties; Step 2: determining the current-voltage curve of the organic light-emitting device at different operating voltages and currents based on the electrical parameter method according to the working environment and use conditions, and determining the electrical characteristics of the organic light-emitting device according to the current-voltage curve; Step 3: determining performance parameters of the organic light-emitting device according to the electrical characteristics of the organic light-emitting device, and determining changes in the internal excitation mechanism of the organic light-emitting device based on the power spectral density method according to the performance parameters; Step 4: Determine the interaction between atoms in the OLED molecules based on the high-precision molecular orbital theory calculated by quantum chemistry according to the changes in the internal excitation mechanism of the OLED; Step 5: Determine the relevant information of the photoelectric conversion efficiency, electrode material state and internal carrier transport characteristics of the organic light-emitting device based on a preset method according to the interaction, analyze the relevant information, and determine the factors affecting the efficiency degradation of the organic light-emitting device according to the analysis results.

[0007] According to a method for determining the efficiency degradation of an organic light-emitting device provided by the present invention, the type and material properties of the organic light-emitting device are obtained, and the working environment and use conditions of the organic light-emitting device are determined according to the type and material properties, including: Obtaining characteristics of the band structure, optical properties and chemical composition of organic light-emitting devices; Obtaining key parameters of the organic light-emitting device based on the characteristics; Determine the use characteristics of the organic light-emitting device according to the key parameters, and determine the type and material properties of the organic light-emitting device according to the use characteristics; Evaluate the thermodynamic properties of the organic light-emitting device according to the type and material properties of the organic light-emitting device, and obtain the behavior of the organic light-emitting device at different temperatures; The working environment and use conditions of the organic light emitting device are determined according to the behavior of the organic light emitting device at different temperatures and in combination with actual use conditions.

[0008] According to a method for determining the efficiency degradation of an organic light-emitting device provided by the present invention, a current-voltage curve of the organic light-emitting device at different operating voltages and currents is determined based on an electrical parameter method according to the working environment and use conditions, and an electrical characteristic of the organic light-emitting device is determined according to the current-voltage curve, including: Determine the electrochemical impedance spectroscopy technique according to the working environment and use conditions, and obtain the current-voltage curve of the organic light-emitting device when it is forward biased according to the electrochemical impedance spectroscopy technique; Determining the minimum voltage, maximum current and related parameters of the forward bias point of the organic light emitting device according to the current-voltage curve of the organic light emitting device when it is forward biased; Determine the current-voltage curve of the organic light-emitting device at different operating voltages and currents based on the electrical parameter method according to the relevant parameters; The electrical characteristics of the organic light emitting device are determined based on the current-voltage curve.

[0009] According to a method for determining efficiency degradation of an organic light-emitting device provided by the present invention, a performance parameter of the organic light-emitting device is determined according to the electrical characteristics of the organic light-emitting device, and a change in the internal excitation mechanism of the organic light-emitting device is determined based on the power spectrum density method according to the performance parameter, including: Acquire an electrical characteristic curve diagram according to the electrical characteristics of the organic light-emitting device, and determine a performance parameter of the organic light-emitting device according to the electrical characteristic curve diagram; Determine the spectral response of the organic light-emitting device under different working conditions based on the performance parameters using a spectrophotometer, and obtain spectral output data under different voltage and temperature conditions; Performing spectral preprocessing on the spectral output data to obtain a preprocessing result, and constructing a spectral library according to the preprocessing result; Determine the power proportion of each spectral point in the spectral library according to spectral band analysis and obtain the power spectral density; The spectral output data and the corresponding power spectral density are associated to form a spectral library-power spectral density map, and the changes in the internal excitation mechanism of the device are determined based on the spectral library-power spectral density map.

[0010] According to a method for determining the efficiency degradation of an organic light-emitting device provided by the present invention, the performance parameters of the organic light-emitting device are determined according to the electrical characteristic curve diagram, including: Determine characteristic change parameters according to the electrical characteristics, and construct an electrical characteristic curve diagram according to the characteristic change parameters; Determine the change of coordinate components on each coordinate axis based on the electrical characteristic curve diagram, and determine the distribution sequence of the difference of the working electrical characteristics of the organic light-emitting device according to the change of the coordinate components; Fitting a Gaussian curve of the organic light-emitting device according to the difference distribution sequence of the working electrical characteristics; Determine finite element values ​​for describing relevant indicators of performance of the organic light-emitting device according to the Gaussian curve; Determine the degradation degree of each performance-related indicator according to the finite element numerical value, and obtain the descriptive parameters of the organic light-emitting device under each performance-related indicator according to the degradation degree; Obtaining a multi-scale performance state vector of the organic light-emitting device according to the description parameters, and determining a photoelectric effect level of the organic light-emitting device according to the multi-scale performance state vector; Determine a performance state index vector of the optoelectronic composite material layer based on the photoelectric effect level and the equilibrium current electrons of the optoelectronic composite material layer of the organic light-emitting device and the material structure of the optoelectronic composite material layer; The performance parameters of the organic light emitting device are determined according to the performance state index vector of the optoelectronic composite material layer.

[0011] According to a method for determining the efficiency degradation of an organic light-emitting device provided by the present invention, the performance parameters of the organic light-emitting device are determined according to the electrical characteristic curve diagram, and further comprises: Obtain device types and working principles of organic light-emitting devices; Analyzing the electrical characteristic curve to determine the shape of the electrical characteristic curve, and obtaining the range of the electrical characteristic according to the shape; The performance parameters of the organic light emitting device are determined according to the range of the electrical characteristics based on the device type and the operating principle of the organic light emitting device.

[0012] According to a method for determining the efficiency degradation of an organic light-emitting device provided by the present invention, the interaction between atoms in the organic light-emitting device molecules is determined based on the high-precision molecular orbital theory of quantum chemical calculation according to the change of the internal excitation mechanism of the organic light-emitting device, including: According to the changes in the internal excitation mechanism of the device, the electronic structure, excited state energy level and transition path parameters of the organic light-emitting device are determined based on density functional theory combined with the theoretical model of first principle charge transfer and reaction potential; Obtain information about atomic coordination, lattice constants, and crystal symmetry based on X-ray diffraction technology; The interaction between atoms in the device molecule is determined based on the relevant information according to the parameters using a high-precision molecular orbital theory based on quantum chemical calculations.

[0013] According to a method for determining the efficiency degradation of an organic light-emitting device provided by the present invention, the relevant information of the photoelectric conversion efficiency, the electrode material state and the internal carrier transport characteristics of the organic light-emitting device is determined based on a preset method according to the interaction, the relevant information is analyzed, and the factors affecting the efficiency degradation of the organic light-emitting device are determined according to the analysis results, including: Obtaining the influence of the interaction between atoms on the transmission speed and scattering probability of electrons and holes, and determining the photoelectric conversion efficiency and internal carrier transport characteristics of the organic light-emitting device based on the photoelectric conversion mechanism according to the influence; Obtaining the influence of the interaction between atoms on the redox reaction and conductivity of the electrode material, determining the chemical composition and structure of the electrode surface based on the characterization technology according to the influence, and determining the state of the electrode material of the organic light-emitting device according to the chemical composition and structure; The relevant information is analyzed, and factors affecting the efficiency degradation of the organic light emitting device are determined according to the analysis results.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The electrical characteristics of the organic light-emitting device are determined based on the electrical parameter method through the working environment and use conditions of the organic light-emitting device, and the changes in the internal excitation mechanism of the organic light-emitting device are determined in combination with the performance parameters of the organic light-emitting device, the interactions between atoms in the organic light-emitting device molecules are determined, and the factors affecting the efficiency degradation of the organic light-emitting device are determined. There is no need for professional technicians to manually observe and analyze the samples, and it is not easily affected by human factors, avoiding erroneous judgments that affect the efficiency degradation of the organic light-emitting device. At the same time, the physical behavior of the device can be efficiently understood, the working efficiency of the organic light-emitting device can be monitored in real time, and more serious degradation of the light-emitting device can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 is a flow chart of a method for determining efficiency degradation of an organic light-emitting device provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a flow chart for determining the working environment and use conditions of an organic light-emitting device according to the device type and material properties provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Embodiment 1: An embodiment of the present invention provides a method for determining the efficiency degradation of an organic light-emitting device, such as Figure 1 As shown, the method mainly includes the following steps: Step 1: Obtain the type and material properties of the organic light-emitting device, and determine the working environment and use conditions of the organic light-emitting device according to the type and material properties; Step 2: determining the current-voltage curve of the organic light-emitting device at different operating voltages and currents based on the electrical parameter method according to the working environment and use conditions, and determining the electrical characteristics of the organic light-emitting device according to the current-voltage curve; Step 3: determining performance parameters of the organic light-emitting device according to the electrical characteristics of the organic light-emitting device, and determining changes in the internal excitation mechanism of the organic light-emitting device based on the power spectral density method according to the performance parameters; Step 4: Determine the interaction between atoms in the OLED molecules based on the high-precision molecular orbital theory calculated by quantum chemistry according to the changes in the internal excitation mechanism of the OLED; Step 5: Determine the relevant information of the photoelectric conversion efficiency, electrode material state and internal carrier transport characteristics of the organic light-emitting device based on a preset method according to the interaction, analyze the relevant information, and determine the factors affecting the efficiency degradation of the organic light-emitting device according to the analysis results.

[0019] In this embodiment, the organic light-emitting device is a new type of electronic light source that combines organic materials with inorganic semiconductors, including: organic light-emitting diodes, organic light-emitting tubes, flexible organic light-emitting diodes, and perovskite organic light-emitting diodes.

[0020] In this embodiment, the material types of the organic light-emitting device include: organic small molecule materials and inorganic semiconductor materials.

[0021] In this embodiment, the working environment of the organic light emitting device includes: Temperature: The operating temperature of organic light-emitting devices is generally between room temperature and about 40 degrees Celsius.

[0022] Humidity: Organic light-emitting devices have relatively low requirements for humidity, but care should be taken to avoid excessive moisture that may cause degradation of material performance or damage to the device.

[0023] Air composition: Organic light-emitting devices need to avoid an overly dry environment, as a dry environment may cause the material to lose moisture, thus affecting the performance of the device.

[0024] In this embodiment, the electrical parameter method is a method of analyzing a material by measuring electrical properties such as conductivity and permittivity of the material, including: resistance method, conductivity method, and capacitance method.

[0025] In this embodiment, the current-voltage curve describes the relationship between current and voltage in the circuit of the organic light emitting device.

[0026] In this embodiment, the electrical characteristics of the organic light emitting device include: conductivity and mobility.

[0027] In this embodiment, the performance parameters of the organic light-emitting device include: operating voltage, operating current, open circuit voltage, and fill factor.

[0028] In this embodiment, the power spectrum density method refers to analyzing the power spectrum density of the organic light-emitting device at different frequencies, so as to indirectly understand the changes in the excitation mechanism inside the device.

[0029] In this embodiment, the change of the excitation mechanism means: if the spectral output of the device increases linearly with the increase of voltage, it may indicate that the excitation mechanism is mainly charge transfer transition; if the spectral output increases rapidly with the increase of temperature, it may be stimulated radiation transition.

[0030] In this embodiment, the high-precision molecular orbital theory is able to accurately describe the interactions between atoms in a molecule, and further predict the geometric configuration, electron density distribution, energy level and other properties of the molecule.

[0031] In this embodiment, in the organic light-emitting device molecules, the interactions between atoms include: conjugation, electrostatic interaction, hydrogen bonding, and dipole-dipole interaction.

[0032] In this embodiment, the preset method includes: electrochemical impedance spectroscopy, transmission electron spectroscopy and photoconductivity testing.

[0033] In this embodiment, the photoelectric conversion efficiency of the organic light-emitting device refers to the efficiency of the device in directly converting light energy into visible or near-infrared light energy.

[0034] In this embodiment, the state of the electrode material of the organic light-emitting device refers to the position and conditions where the electrochemical reaction occurs in the device.

[0035] In this embodiment, the internal carrier transport characteristics of the organic light-emitting device refer to the migration, distribution and transmission behaviors of electrons and holes inside the material during the light-emitting process.

[0036] In this embodiment, the degradation factors may be: temperature change, humidity change, and electrode material performance change.

[0037] The beneficial effects of the above technical solution are: determining the electrical characteristics of the organic light-emitting device based on the electrical parameter method through the working environment and use conditions of the organic light-emitting device, and determining the changes in the internal excitation mechanism of the organic light-emitting device in combination with the performance parameters of the organic light-emitting device, determining the interactions between atoms in the organic light-emitting device molecules, and determining the factors affecting the efficiency degradation of the organic light-emitting device. It does not require professional technicians to manually observe and analyze the samples, is not easily affected by human factors, and avoids erroneous judgments that affect the efficiency degradation of the organic light-emitting device. At the same time, it can efficiently understand the physical behavior of the device, monitor the working efficiency of the organic light-emitting device in real time, and avoid more serious degradation of the light-emitting device.

[0038] Embodiment 2: Based on Example 1, the embodiment of the present invention obtains the type and material properties of the organic light-emitting device, and determines the working environment and use conditions of the organic light-emitting device according to the type and material properties, such as Figure 2 As shown, including: S01: Obtain the characteristics of the band structure, optical properties and chemical composition of organic light-emitting devices; S02: Obtain key parameters of the organic light-emitting device according to the characteristics; S03: determining the use characteristics of the organic light-emitting device according to the key parameters, and determining the type and material properties of the organic light-emitting device according to the use characteristics; S04: evaluating the thermodynamic properties of the organic light-emitting device according to the type and material properties of the organic light-emitting device, and obtaining the behavior of the organic light-emitting device at different temperatures; S05: Determine the working environment and use conditions of the organic light emitting device according to the behavior of the organic light emitting device at different temperatures and in combination with actual use conditions.

[0039] In this embodiment, the energy band structure of the organic light-emitting device refers to the energy distribution of electrons and holes in the device.

[0040] In this embodiment, the optical performance of the organic light-emitting device refers to the characteristics such as the intensity, color, and spectral range of light emitted or absorbed by the organic light-emitting device within a specific wavelength range.

[0041] In this embodiment, the chemical composition of the organic light-emitting device is composed of hydrocarbons, nitrogen, oxygen, halogens and other non-metallic elements.

[0042] In this embodiment, key parameters include: operating voltage, operating current, temperature range, electric field strength, and magnetic field strength.

[0043] In this embodiment, the use characteristics of the organic light-emitting device include: Performance: It has the advantages of fast response, high contrast and wide viewing angle.

[0044] Reliability: Compared with other types of display technologies, such as liquid crystal displays, organic light-emitting devices have higher stability during long-term use. Since organic light-emitting devices have a simple structure and are free of a series of problems caused by liquids, such as leakage and screen burn-in, they have a longer service life.

[0045] In this embodiment, the material properties include: semiconductor band gap, carrier mobility, and radiation efficiency.

[0046] In this embodiment, the thermodynamic properties include: thermal conductivity, specific heat capacity, and expansion coefficient.

[0047] In this embodiment, actual usage conditions include: ambient temperature, humidity, oxygen concentration, electric field strength, and magnetic field strength.

[0048] The beneficial effect of the above technical solution is: the working environment and use conditions of the organic light-emitting device can be determined according to the type and material properties of the organic light-emitting device, the working temperature range and use environment of the organic light-emitting device can be determined, and the corresponding working temperature and use environment can be selected to improve the use efficiency and stability of the device and prevent the device from more serious degradation.

[0049] Embodiment 3: Based on Example 2, the embodiment of the present invention determines the current-voltage curve of the organic light-emitting device under different working voltages and currents based on the electrical parameter method according to the working environment and use conditions, and determines the electrical characteristics of the organic light-emitting device according to the current-voltage curve, including: Determine the electrochemical impedance spectroscopy technique according to the working environment and use conditions, and obtain the current-voltage curve of the organic light-emitting device when it is forward biased according to the electrochemical impedance spectroscopy technique; Determining the minimum voltage, maximum current and related parameters of the forward bias point of the organic light emitting device according to the current-voltage curve of the organic light emitting device when it is forward biased; Determine the current-voltage curve of the organic light-emitting device at different operating voltages and currents based on the electrical parameter method according to the relevant parameters; The electrical characteristics of the organic light emitting device are determined based on the current-voltage curve.

[0050] In this embodiment, the electrochemical impedance spectroscopy technique is a non-destructive testing method of electrochemical impedance analysis, which studies the structure and properties of the organic light-emitting device by measuring the impedance change of the organic light-emitting device under the action of external current or voltage.

[0051] In this embodiment, the forward bias of the organic light emitting device refers to applying a forward voltage between the positive electrode of the PN junction and the ground, so that the holes in the P-type semiconductor region flow to the N-type semiconductor region and recombine with the free electrons in the N-type region, thereby realizing the flow of current.

[0052] In this embodiment, the electrical characteristics include: slope of the forward bias point, conductivity, and carrier mobility.

[0053] The beneficial effect of the above technical solution is: the current-voltage curve of the organic light-emitting device when it is forward biased is determined according to the working environment and usage conditions, so as to determine the current-voltage curve of the organic light-emitting device under different working voltages and currents according to the electrical parameter method, and obtain the electrical characteristics of the organic light-emitting device. The transmission rate and transmission mode of the carriers in the device can be determined, and the structure of the device can be changed to improve the performance of the device.

[0054] Embodiment 4: Based on Example 3, the embodiment of the present invention determines the performance parameters of the organic light-emitting device according to the electrical characteristics of the organic light-emitting device, and determines the change of the internal excitation mechanism of the organic light-emitting device based on the power spectrum density method according to the performance parameters, including: Acquire an electrical characteristic curve diagram according to the electrical characteristics of the organic light-emitting device, and determine a performance parameter of the organic light-emitting device according to the electrical characteristic curve diagram; Determine the spectral response of the organic light-emitting device under different working conditions based on the performance parameters using a spectrophotometer, and obtain spectral output data under different voltage and temperature conditions; Performing spectral preprocessing on the spectral output data to obtain a preprocessing result, and constructing a spectral library according to the preprocessing result; Determine the power proportion of each spectral point in the spectral library according to spectral band analysis and obtain the power spectral density; The spectral output data and the corresponding power spectral density are associated to form a spectral library-power spectral density map, and the changes in the internal excitation mechanism of the device are determined based on the spectral library-power spectral density map.

[0055] In this embodiment, the spectral response refers to a measure of an object's ability to absorb or reflect light of different wavelengths.

[0056] In this embodiment, the spectral output data is data describing the intensity and color of light emitted by the light source within a specific wavelength band.

[0057] In this embodiment, the spectral band analysis refers to decomposing the spectral signal into a plurality of harmonic components with different wavelengths, and then judging the change of the excitation mechanism according to the intensity comparison of each harmonic component.

[0058] In this embodiment, the power spectrum density is an indicator that describes the distribution of a signal in the frequency domain and provides a relationship between signal energy and frequency.

[0059] In this embodiment, the spectrum library-power spectrum density mapping is to establish a correlation between the spectrum of different wavelengths and the corresponding power spectrum density.

[0060] In this embodiment, the change of the excitation mechanism means: if the spectral output of the device increases linearly with the increase of voltage, it may indicate that the excitation mechanism is mainly charge transfer transition; if the spectral output increases rapidly with the increase of temperature, it may be stimulated radiation transition.

[0061] The beneficial effects of the above technical solution are: determining the performance parameters of the organic light-emitting device based on the electrical characteristic curve diagram, and determining the spectral response of the organic light-emitting device under different working conditions based on the spectrophotometer, constructing a spectral library to obtain the power spectral density, and determining the changes in the internal excitation mechanism of the device. This information can be used to optimize the structure and working function of the device and improve the photoelectric conversion efficiency and stability.

[0062] Embodiment 5: Based on Example 4, the embodiment of the present invention determines the performance parameters of the organic light-emitting device according to the electrical characteristic curve diagram, including: Determine characteristic change parameters according to the electrical characteristics, and construct an electrical characteristic curve diagram according to the characteristic change parameters; Determine the change of coordinate components on each coordinate axis based on the electrical characteristic curve diagram, and determine the distribution sequence of the difference of the working electrical characteristics of the organic light-emitting device according to the change of the coordinate components; Fitting a Gaussian curve of the organic light-emitting device according to the difference distribution sequence of the working electrical characteristics; Determine finite element values ​​for describing relevant indicators of performance of the organic light-emitting device according to the Gaussian curve; Determine the degradation degree of each performance-related indicator according to the finite element numerical value, and obtain the descriptive parameters of the organic light-emitting device under each performance-related indicator according to the degradation degree; Obtaining a multi-scale performance state vector of the organic light-emitting device according to the description parameters, and determining a photoelectric effect level of the organic light-emitting device according to the multi-scale performance state vector; Determine a performance state index vector of the optoelectronic composite material layer based on the photoelectric effect level and the equilibrium current electrons of the optoelectronic composite material layer of the organic light-emitting device and the material structure of the optoelectronic composite material layer; The performance parameters of the organic light emitting device are determined according to the performance state index vector of the optoelectronic composite material layer.

[0063] In this embodiment, the electrical characteristic variation parameters refer to a group of parameters that describe the variation of electrical characteristics with time, temperature, chemical reaction and other factors, including: electrical conductivity, electrical thermal conductivity, dielectric constant, and capacitance.

[0064] In this embodiment, the electrical characteristic curve is a graph used to describe the relationship between the electrical characteristics and the factors such as time, temperature, and chemical reaction, including: time dependence and temperature dependence.

[0065] In this embodiment, the change of the coordinate components on the coordinate axis refers to the change of the spatial data represented on the two-dimensional plane in different dimensions.

[0066] In this embodiment, the operating voltage characteristic difference distribution sequence of the organic light emitting device is data describing the performance difference of the organic light emitting device at different operating voltages.

[0067] In this embodiment, the Gaussian curve of the organic light emitting device describes the relationship between the light emission intensity and the voltage.

[0068] In this embodiment, the finite element values ​​of the performance-related indicators of the organic light-emitting device are, for example: Electric field distribution: In organic light-emitting devices, the electric field distribution has a great influence on the light-emitting performance. The distribution of the electric field at different locations can be calculated by finite element analysis to evaluate the uniformity of the device and local overheating problems.

[0069] Temperature distribution: Organic light-emitting devices generate heat during operation, resulting in temperature changes. Finite element analysis can predict the temperature distribution at different locations so that appropriate heat dissipation measures can be taken.

[0070] Carrier transport: Finite element analysis can be used to study the speed, impedance, and degree of obstruction of carrier transfer within a device.

[0071] In this embodiment, the degradation degree refers to the degree to which a certain indicator is affected by the degradation factor compared with the normal value of the indicator.

[0072] In this embodiment, the description parameters of various performance-related indicators of the organic light-emitting device may be: Parameters describing the electric field distribution: maximum electric field value, minimum electric field value, electric field gradient, potential difference, local polarizability, and charge density.

[0073] Temperature distribution description parameters: average temperature, maximum temperature, temperature gradient, heat flux density, heat flux, thermal conductivity.

[0074] Carrier transport description parameters: carrier mobility, carrier lifetime, carrier diffusion coefficient, carrier recombination rate, carrier recombination constant.

[0075] In this embodiment, the multi-scale performance state vector of the organic light-emitting device is information describing the performance state of the device at different scales, such as: Microstructure: Describes the microstructure and characteristics of OLEDs, such as material composition, crystal structure, and chemical bond strength.

[0076] Electrical properties: Describe the electrical properties of organic light-emitting devices, such as carrier mobility, interface barrier, and resistance.

[0077] Light absorption properties: describes the light absorption ability of organic light-emitting devices, such as band gap, absorption coefficient, etc.

[0078] Thermal properties: describe the heat diffusion and energy transfer capabilities of organic light-emitting devices.

[0079] In this embodiment, the photoelectric effect level of the organic light emitting device refers to the efficiency of the device in converting light energy into electrical energy.

[0080] In this embodiment, the equilibrium current of the optoelectronic composite material layer of the organic light-emitting device refers to a mechanism or process that enables electrons and holes to reach a balanced state.

[0081] In this embodiment, the performance state index vector of the optoelectronic composite material layer is a numerical vector used to describe the optical properties of the organic light-emitting device, such as light absorption coefficient, photoluminescence intensity, photoluminescence efficiency, and color coordinates.

[0082] The beneficial effect of the above technical solution is that the performance parameters of the organic light-emitting device are determined according to the performance state index vector of the optoelectronic composite material layer, and the materials suitable for making the organic light-emitting device can be selected in a targeted manner to obtain high-performance devices and improve the device stability and reliability.

[0083] Embodiment 6: Based on Example 5, the embodiment of the present invention determines the performance parameters of the organic light-emitting device according to the electrical characteristic curve, and further includes: Obtain device types and working principles of organic light-emitting devices; Analyzing the electrical characteristic curve to determine the shape of the electrical characteristic curve, and obtaining the range of the electrical characteristic according to the shape; The performance parameters of the organic light emitting device are determined according to the range of the electrical characteristics based on the device type and the operating principle of the organic light emitting device.

[0084] In this embodiment, the electric characteristic graph is an image that depicts changes in the electric characteristics of a semiconductor element such as a resistor or a capacitor.

[0085] In this embodiment, the shape of the electrical characteristic graph is used to determine whether a specific cutoff frequency, impedance value, or bandwidth exists.

[0086] In this embodiment, the range of the electrical characteristics includes: a frequency range and a voltage range.

[0087] In this embodiment, the performance parameters include: slope of the curve, pole position, frequency response, linearity, and gain.

[0088] The beneficial effects of the above technical solution are: obtaining the range of electrical characteristics according to the electrical characteristics curve diagram, and determining the performance parameters of the organic light-emitting device in combination with the device type and working principle of the organic light-emitting device, which can better understand the working mechanism and related performance of the organic light-emitting device, optimize these performances, and reduce the efficiency degradation of the organic light-emitting device.

[0089] Embodiment 7: Based on Example 6, the embodiment of the present invention determines the interaction between atoms in the organic light-emitting device molecules based on the high-precision molecular orbital theory of quantum chemical calculation according to the changes in the internal excitation mechanism of the organic light-emitting device, including: According to the changes in the internal excitation mechanism of the device, the electronic structure, excited state energy level and transition path parameters of the organic light-emitting device are determined based on density functional theory combined with the theoretical model of first principle charge transfer and reaction potential; Obtain information about atomic coordination, lattice constants, and crystal symmetry based on X-ray diffraction technology; The interaction between atoms in the device molecule is determined based on the relevant information according to the parameters using a high-precision molecular orbital theory based on quantum chemical calculations.

[0090] In this embodiment, density functional theory is used to determine information on bond lengths, bond angles, and atomic charge distribution between atoms.

[0091] In this embodiment, the first principles theoretical model of charge transfer and reaction potential mainly involves the formation and breaking of chemical bonds, and the change of charge density distribution.

[0092] In this embodiment, the electronic structure of the organic light-emitting device refers to the electronic arrangement of the organic molecules constituting the device.

[0093] In this embodiment, the excited state energy level of the organic light-emitting device refers to the most stable energy level that can be reached after the organic molecules are ionized.

[0094] In this embodiment, the transition path of the organic light-emitting device is, for example: Excited state: In this state, the electron has absorbed enough energy to overcome the intermolecular attraction and thus break away from the molecule and enter an excited state.

[0095] Ground state: The normal stable state of an atom, which is also the state of electrons before they are excited.

[0096] Intermediate state: Between these two states, the electron will experience a period of intermediate state, during which it will continue to jump between the ground state and the excited state.

[0097] In this embodiment, X-ray diffraction utilizes the scattering of X-rays by crystals to study the internal structure of matter.

[0098] In this embodiment, the atomic coordination of the organic light-emitting device includes: a conjugated system, an aromatic compound, and a bond between a metal and a non-metal.

[0099] In this embodiment, the lattice constant represents the spatial position relationship of atoms in the lattice.

[0100] The beneficial effects of the above technical solution are: determining the electronic structure, excited state energy level and transition path parameters of the organic light-emitting device according to the changes in the internal excitation mechanism of the organic light-emitting device, and obtaining relevant information of the atoms, thereby determining the interaction between atoms in the device molecules, and obtaining the energy band structure of the material, and then obtaining its electrical properties, providing information about the stability and reliability of the device, thereby improving the service life of the device based on this information.

[0101] Embodiment 8: Based on Example 7, the embodiment of the present invention determines the relevant information of the photoelectric conversion efficiency, electrode material state and internal carrier transport characteristics of the organic light-emitting device based on the preset method according to the interaction, analyzes the relevant information, and determines the factors affecting the efficiency degradation of the organic light-emitting device according to the analysis results, including: Obtaining the influence of the interaction between atoms on the transmission speed and scattering probability of electrons and holes, and determining the photoelectric conversion efficiency and internal carrier transport characteristics of the organic light-emitting device based on the photoelectric conversion mechanism according to the influence; Obtaining the influence of the interaction between atoms on the redox reaction and conductivity of the electrode material, determining the chemical composition and structure of the electrode surface based on the characterization technology according to the influence, and determining the state of the electrode material of the organic light-emitting device according to the chemical composition and structure; The relevant information is analyzed, and factors affecting the efficiency degradation of the organic light emitting device are determined according to the analysis results.

[0102] In this embodiment, the effects of the interatomic interactions on the transmission speed and scattering probability of electrons and holes include: Transfer speed: The interaction between atoms will reduce the transfer speed of electrons and holes from excited states to non-excited states. This is because the interaction within the molecule will cause the excited energy level to redshift, making it easier for electrons to jump back to the ground state.

[0103] Scattering probability: The interaction between atoms will also affect the scattering process between electrons and holes. Since the strength and type of interaction will affect the charge distribution within the molecule, different types of interactions may lead to different scattering patterns. For example, strong polar interactions may lead to short-range scattering, while long-range non-polar interactions may lead to long-range scattering.

[0104] In this embodiment, the effects of the interaction between atoms on the redox reaction and conductivity of the electrode material include: Redox reaction: The interaction between atoms will affect the charge distribution within or between molecules, which in turn affects the redox reaction of the electrode material. For example, if the interaction between molecules is strong, then under the action of the electric field, electrons may be forced to move, resulting in uneven charge distribution, which may affect the redox reaction of the electrode material and cause changes in electrochemical properties.

[0105] Conductivity: The interaction between atoms will also affect the conductivity of the electrode material. Conductivity refers to the current density per unit volume or cross-sectional area. The interaction between atoms will change the charge distribution within the molecule, thereby affecting the conductivity of the electrode material.

[0106] The beneficial effects of the above technical solution are: by determining the relevant information of the photoelectric conversion efficiency, electrode material state and internal carrier transport characteristics of the organic light-emitting device based on the interaction between atoms, the working mechanism of the device can be better understood, so that a more efficient and stable organic light-emitting device can be obtained. Furthermore, the factors affecting the efficiency degradation of the organic light-emitting device can be determined, so as to avoid further efficiency degradation of the organic light-emitting device and improve the performance of the organic light-emitting device.

[0107] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for determining efficiency degradation of an organic light-emitting device, characterized in that: include: Step 1: Obtain the type and material properties of the organic light-emitting device, and determine the working environment and use conditions of the organic light-emitting device according to the type and material properties; Step 2: determining the current-voltage curve of the organic light-emitting device at different operating voltages and currents based on the electrical parameter method according to the working environment and use conditions, and determining the electrical characteristics of the organic light-emitting device according to the current-voltage curve; Step 3: determining performance parameters of the organic light-emitting device according to the electrical characteristics of the organic light-emitting device, and determining changes in the internal excitation mechanism of the organic light-emitting device based on the power spectral density method according to the performance parameters; Step 4: Determine the interaction between atoms in the OLED molecules based on the high-precision molecular orbital theory calculated by quantum chemistry according to the changes in the internal excitation mechanism of the OLED; Step 5: Determine the relevant information of the photoelectric conversion efficiency, electrode material state and internal carrier transport characteristics of the organic light-emitting device based on a preset method according to the interaction, analyze the relevant information, and determine the factors affecting the efficiency degradation of the organic light-emitting device according to the analysis results.

2. The method for determining the efficiency degradation of an organic light-emitting device according to claim 1, characterized in that: Obtaining the type and material properties of the organic light-emitting device, and determining the working environment and use conditions of the organic light-emitting device according to the type and material properties, including: Obtaining characteristics of the band structure, optical properties and chemical composition of organic light-emitting devices; Obtaining key parameters of the organic light-emitting device based on the characteristics; Determine the use characteristics of the organic light-emitting device according to the key parameters, and determine the type and material properties of the organic light-emitting device according to the use characteristics; Evaluate the thermodynamic properties of the organic light-emitting device according to the type and material properties of the organic light-emitting device, and obtain the behavior of the organic light-emitting device at different temperatures; The working environment and use conditions of the organic light emitting device are determined according to the behavior of the organic light emitting device at different temperatures and in combination with actual use conditions.

3. The method for determining the efficiency degradation of an organic light-emitting device according to claim 1, characterized in that: According to the working environment and use conditions, a current-voltage curve of the organic light-emitting device at different working voltages and currents is determined based on an electrical parameter method, and the electrical characteristics of the organic light-emitting device are determined according to the current-voltage curve, including: Determine the electrochemical impedance spectroscopy technique according to the working environment and use conditions, and obtain the current-voltage curve of the organic light-emitting device when it is forward biased according to the electrochemical impedance spectroscopy technique; Determining the minimum voltage, maximum current and related parameters of the forward bias point of the organic light emitting device according to the current-voltage curve when the organic light emitting device is forward biased; Determine the current-voltage curve of the organic light-emitting device at different operating voltages and currents based on the electrical parameter method according to the relevant parameters; The electrical characteristics of the organic light emitting device are determined based on the current-voltage curve.

4. The method for determining the efficiency degradation of an organic light-emitting device according to claim 1, characterized in that: Determining performance parameters of the organic light-emitting device according to the electrical characteristics of the organic light-emitting device, and determining changes in the internal excitation mechanism of the organic light-emitting device based on the power spectrum density method according to the performance parameters, including: Acquire an electrical characteristic curve diagram according to the electrical characteristics of the organic light-emitting device, and determine a performance parameter of the organic light-emitting device according to the electrical characteristic curve diagram; Determine the spectral response of the organic light-emitting device under different working conditions based on the performance parameters using a spectrophotometer, and obtain spectral output data under different voltage and temperature conditions; Performing spectral preprocessing on the spectral output data to obtain a preprocessing result, and constructing a spectral library according to the preprocessing result; Determine the power proportion of each spectral point in the spectral library according to spectral band analysis and obtain the power spectral density; The spectral output data and the corresponding power spectral density are associated to form a spectral library-power spectral density map, and the changes in the internal excitation mechanism of the device are determined based on the spectral library-power spectral density map.

5. The method for determining the efficiency degradation of an organic light-emitting device according to claim 4, characterized in that: Determining the performance parameters of the organic light emitting device according to the electrical characteristic curve diagram includes: Determine characteristic change parameters according to the electrical characteristics, and construct an electrical characteristic curve diagram according to the characteristic change parameters; Determine the change of coordinate components on each coordinate axis based on the electrical characteristic curve diagram, and determine the distribution sequence of the difference of the working electrical characteristics of the organic light-emitting device according to the change of the coordinate components; Fitting a Gaussian curve of the organic light-emitting device according to the difference distribution sequence of the working electrical characteristics; Determine finite element values ​​for describing relevant indicators of performance of the organic light-emitting device according to the Gaussian curve; Determine the degradation degree of each performance-related indicator according to the finite element numerical value, and obtain the descriptive parameters of the organic light-emitting device under each performance-related indicator according to the degradation degree; Obtaining a multi-scale performance state vector of the organic light-emitting device according to the description parameters, and determining a photoelectric effect level of the organic light-emitting device according to the multi-scale performance state vector; Determine a performance state index vector of the optoelectronic composite material layer based on the photoelectric effect level and the equilibrium current electrons of the optoelectronic composite material layer of the organic light-emitting device and the material structure of the optoelectronic composite material layer; The performance parameters of the organic light emitting device are determined according to the performance state index vector of the optoelectronic composite material layer.

6. The method for determining the efficiency degradation of an organic light-emitting device according to claim 4, characterized in that: Determining the performance parameters of the organic light emitting device according to the electrical characteristic curve diagram also includes: Obtain device types and working principles of organic light-emitting devices; Analyzing the electrical characteristic curve to determine the shape of the electrical characteristic curve, and obtaining the range of the electrical characteristic according to the shape; The performance parameters of the organic light emitting device are determined according to the range of the electrical characteristics based on the device type and the operating principle of the organic light emitting device.

7. The method for determining the efficiency degradation of an organic light-emitting device according to claim 1, characterized in that: According to the changes in the internal excitation mechanism of the organic light-emitting device, the high-precision molecular orbital theory based on quantum chemical calculations determines the interactions between atoms in the organic light-emitting device molecules, including: According to the changes in the internal excitation mechanism of the device, the electronic structure, excited state energy level and transition path parameters of the organic light-emitting device are determined based on density functional theory combined with the theoretical model of first principle charge transfer and reaction potential; Obtain information about atomic coordination, lattice constants, and crystal symmetry based on X-ray diffraction technology; The interaction between atoms in the device molecule is determined based on the relevant information according to the parameters using a high-precision molecular orbital theory based on quantum chemical calculations.

8. The method for determining the efficiency degradation of an organic light-emitting device according to claim 1, characterized in that: Determining, based on the interaction, relevant information about the photoelectric conversion efficiency, electrode material state, and internal carrier transport characteristics of the organic light-emitting device based on a preset method, analyzing the relevant information, and determining factors that affect the efficiency degradation of the organic light-emitting device based on the analysis results, including: Obtaining the influence of the interaction between atoms on the transmission speed and scattering probability of electrons and holes, and determining the photoelectric conversion efficiency and internal carrier transport characteristics of the organic light-emitting device based on the photoelectric conversion mechanism according to the influence; Obtaining the influence of the interaction between atoms on the redox reaction and conductivity of the electrode material, determining the chemical composition and structure of the electrode surface based on the characterization technology according to the influence, and determining the state of the electrode material of the organic light-emitting device according to the chemical composition and structure; The relevant information is analyzed, and factors affecting the efficiency degradation of the organic light emitting device are determined according to the analysis results.

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