Electrofluorescent device performance test system and test method

Abstract

The application relates to the technical field of optical performance testing, and discloses an electrically induced circular polarization light-emitting device performance testing system and a testing method. The system integrates an electrical performance measuring module and an optical performance module, continuously provides an electrical signal required for testing to a to-be-tested circular polarization light-emitting device through a source table, and transmits the electrical signal to a testing terminal, so as to determine the electrical performance parameter of the to-be-tested circular polarization light-emitting device according to the electrical signal. In addition, the system collects divergent light photons of the to-be-tested circular polarization light-emitting device through a first integrating sphere, transmits the light photons to a first spectrometer, obtains the light-emitting spectrum information of the to-be-tested circular polarization light-emitting device, and determines the optical performance parameter of the to-be-tested circular polarization light-emitting device according to the light-emitting spectrum information through the testing terminal. Therefore, the electrical performance measurement and the optical performance measurement of the circular polarization light-emitting device are integrated and synchronously measured, so that the process of data calculation and processing in the later stage is not too complicated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical performance testing, and particularly relates to a circularly polarized electroluminescent device performance testing system and a testing method. BACKGROUND

[0002] Circularly polarized light emitting devices are core components of new generation information technology, and have revolutionary potential in quantum communication, 3D display, optical information encryption and biological medicine. Such devices can significantly improve data transmission security, display clarity and biological imaging accuracy by directly emitting highly asymmetric circularly polarized light, meeting the technical requirements of miniaturization, low power consumption and multi-functional integration.

[0003] In the performance testing of existing circularly polarized light emitting devices, it is difficult to simultaneously measure the electrical and optical characteristics of the circularly polarized light emitting device, resulting in a too cumbersome process of later data calculation and processing. SUMMARY

[0004] Therefore, the present application provides a circularly polarized electroluminescent device performance testing system and a testing method, which solves the technical problem that in the performance testing of existing circularly polarized light emitting devices, it is difficult to simultaneously measure the electrical and optical characteristics of the circularly polarized light emitting device, resulting in a too cumbersome process of later data calculation and processing.

[0005] The first aspect of the present application provides a circularly polarized electroluminescent device performance testing system, comprising: an electrical performance measurement module, an optical performance module and a testing terminal.

[0006] The electrical performance measurement module comprises a source table and a device clamp for clamping a circularly polarized light emitting device to be tested, and the source table is connected to the circularly polarized light emitting device to be tested and the testing terminal on both sides. The source table is used to continuously provide the circularly polarized light emitting device to be tested with an electrical signal required for testing, and to make the circularly polarized light emitting device to be tested emit divergent light photons, and is also used to transmit the electrical signal to the testing terminal.

[0007] The optical performance module comprises a first integrating sphere and a first spectrometer connected to the first integrating sphere; the first integrating sphere collects the divergent light photons emitted by the circularly polarized light emitting device to be tested and transmits them to the first spectrometer; and the first spectrometer is used to detect first spectral information of the divergent light photons and transmit the first spectral information to the testing terminal.

[0008] The testing terminal is used to determine electrical performance parameters and optical performance parameters of the circularly polarized light emitting device to be tested according to the electrical signal and the first spectral information, respectively.

[0009] Preferably, the electrical signal comprises a voltage signal and a current signal; and the electrical performance parameter comprises a current density-voltage curve, a turn-on voltage and a voltage peak corresponding to a maximum brightness of the device.

[0010] The test terminal is configured to determine the turn-on voltage and the voltage peak corresponding to the maximum brightness of the device according to the voltage signal, and to determine a current density of the circularly polarized light-emitting device according to a predetermined light-emitting area of the circularly polarized light-emitting device and the current signal, and to determine the current density-voltage curve according to the current density and the voltage signal.

[0011] Preferably, the optical performance parameter comprises a brightness-voltage curve.

[0012] The test terminal is configured to determine a light-emitting brightness of the circularly polarized light-emitting device according to the first spectral information, and to determine the brightness-voltage curve according to the light-emitting brightness and the voltage signal.

[0013] Preferably, the optical performance parameter comprises a maximum external quantum efficiency.

[0014] The test terminal is configured to determine the maximum external quantum efficiency according to the first spectral information and the current signal.

[0015] Preferably, the system further comprises a circularly polarized light path module; and the optical performance module further comprises a second integrating sphere and a second spectrometer connected to the second integrating sphere.

[0016] The circularly polarized light path module is configured to split the divergent light emitted by the circularly polarized light-emitting device into first linearly polarized light and second linearly polarized light.

[0017] The first linearly polarized light and the second linearly polarized light are transmitted to the first spectrometer and the second spectrometer, respectively, after passing through the first integrating sphere and the second integrating sphere, respectively.

[0018] The first spectrometer and the second spectrometer are configured to transmit second spectral information and third spectral information corresponding to the first linearly polarized light and the second linearly polarized light, respectively, to the test terminal.

[0019] The test terminal is configured to determine the optical performance parameter of the circularly polarized light-emitting device according to the second spectral information and the third spectral information.

[0020] Preferably, the circularly polarized light path module comprises a collimating lens, a quarter-wave plate, a polarization splitting prism, a converging lens, a converging lens and a mounting seat.

[0021] The collimating lens, the quarter-wave plate and the polarization beam splitter prism are arranged along an optical axis in sequence.

[0022] The converging lens is arranged on a reflection light path of the polarization beam splitter prism and is arranged opposite to the second integrating sphere.

[0023] The converging lens is arranged on a refraction light path of the polarization beam splitter prism and is arranged opposite to the first integrating sphere.

[0024] The quarter-wave plate is mounted on the mounting seat, and the quarter-wave plate is switched in the first direction or the second direction by rotating the mounting seat.

[0025] Preferably, the optical performance parameter includes an electroluminescence asymmetry factor; the second spectral information includes a first linearly polarized light flux measured in the first direction and a first linearly polarized light flux measured in the second direction; and the third spectral information includes a second linearly polarized light flux measured in the first direction and a second linearly polarized light flux measured in the second direction.

[0026] The test terminal is configured to determine a total first linearly polarized light flux according to the first linearly polarized light flux measured in the first direction and the first linearly polarized light flux measured in the second direction, determine a total second linearly polarized light flux according to the second linearly polarized light flux measured in the first direction and the second linearly polarized light flux measured in the second direction, and determine the electroluminescence asymmetry factor according to the total first linearly polarized light flux and the total second linearly polarized light flux.

[0027] In a second aspect, the present application further provides a test method applied to the electroluminescence circularly polarized light device performance test system of the first aspect, and the method comprises the following steps.

[0028] The source table continuously provides an electrical signal required for testing to the to-be-tested circularly polarized light device, and makes the to-be-tested circularly polarized light device emit divergent light photons, and the electrical signal is transmitted to the test terminal.

[0029] The first integrating sphere collects the divergent light photons emitted by the to-be-tested circularly polarized light device, and transmits the divergent light photons to the first spectrometer, the first spectrometer detects first spectral information of the divergent light photons, and transmits the first spectral information to the test terminal.

[0030] The test terminal determines electrical performance parameters and optical performance parameters of the to-be-tested circularly polarized light device according to the electrical signal and the first spectral information, respectively.

[0031] Preferably, the electrical performance parameters include current density-voltage curve, turn-on voltage and voltage peak corresponding to maximum brightness of the device; and the optical performance parameters include brightness-voltage curve and maximum external quantum efficiency.

[0032] Preferably, the circularly polarized electroluminescent device performance testing system further comprises a circularly polarized light path module; the optical performance module further comprises a second integrating sphere and a second spectrometer connected to the second integrating sphere; and the method further comprises:

[0033] splitting the divergent light emitted by the circularly polarized electroluminescent device to be tested into first linearly polarized light and second linearly polarized light;

[0034] after the first linearly polarized light and the second linearly polarized light pass through the first integrating sphere and the second integrating sphere respectively, the first linearly polarized light and the second linearly polarized light are transmitted to the first spectrometer and the second spectrometer respectively;

[0035] the first spectrometer and the second spectrometer transmit second spectral information and third spectral information corresponding to the first linearly polarized light and the second linearly polarized light to the test terminal respectively;

[0036] the test terminal determines the optical performance parameters of the circularly polarized electroluminescent device to be tested according to the second spectral information and the third spectral information; wherein the optical performance parameters include electroluminescence asymmetry factor.

[0037] From the above technical solutions, it can be seen that the present application integrates the electrical performance measurement module and the optical performance module, continuously provides the electrical signal required for testing for the circularly polarized electroluminescent device to be tested, and transmits the electrical signal to the test terminal, so as to determine the electrical performance parameters of the circularly polarized electroluminescent device to be tested according to the electrical signal, collects the divergent light of the circularly polarized electroluminescent device to be tested by the first integrating sphere, and transmits the divergent light to the first spectrometer to obtain the luminescence spectral information of the circularly polarized electroluminescent device to be tested, and determines the optical performance parameters of the circularly polarized electroluminescent device to be tested according to the luminescence spectral information by the test terminal, so as to integrate the electrical performance measurement and the optical performance measurement of the circularly polarized electroluminescent device for synchronous measurement, thereby avoiding the process of data calculation and processing being too complicated. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0039] Figure 1A first structural schematic diagram of an electroluminescence circularly polarized light device performance test system provided by an embodiment of the present application is shown in FIG. 1.

[0040] Figure 2 A second structural schematic diagram of an electroluminescence circularly polarized light device performance test system provided by an embodiment of the present application is shown in FIG. 2.

[0041] Figure 3 A first structural schematic diagram of an electroluminescence circularly polarized light device performance test system provided by an embodiment of the present application is shown in FIG. 1.

[0042] Figure 4 A second structural schematic diagram of an electroluminescence circularly polarized light device performance test system provided by an embodiment of the present application is shown in FIG. 2.

[0043] Figure 5 A circularly polarized light module optical principle diagram provided by an embodiment of the present application is shown in FIG. 6.

[0044] Figure 6 An electroluminescence asymmetric factor curve diagram provided by an embodiment of the present application is shown in FIG. 7.

[0045] Figure 7 A flowchart of a test method of an electroluminescence circularly polarized light device performance test system provided by an embodiment of the present application is shown in FIG. 8. DETAILED DESCRIPTION

[0046] In order to make the personnel in the technical field better understand the present application scheme, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person of ordinary skill in the art without making creative labor belong to the scope of protection of the present application.

[0047] Unless specifically stated or otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In the context of the technical solutions of the present application in the real scene, all technical and scientific terms used herein can also have meanings corresponding to the purpose of implementing the technical solutions of the present application. The terms "first, second" used herein are only used for distinguishing names, not representing specific quantities or sequences. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0048] It should be noted that when an element is considered to be "fixed" to another element, it can be directly fixed to the other element or a middle element can exist; when an element is considered to be "connected" to another element, it can be directly connected to the other element or a middle element can exist; when an element is considered to be "mounted" to another element, it can be directly mounted to the other element or a middle element can exist. When an element is considered to be "provided" to another element, it can be directly provided to the other element or a middle element can exist.

[0049] Unless specifically stated or otherwise defined, "said", "the" used herein refers to the technical features or technical contents mentioned or described before the corresponding position, which can be the same as or similar to the technical features or technical contents mentioned. In addition, the terms "include" and "have" used herein and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally also includes other steps or units inherent to the process, method, product or device.

[0050] As shown in Figure 1 and Figure 2 The embodiment of the present application provides a circularly polarized electroluminescent device performance test system, which comprises an electrical performance measurement module 1, an optical performance module 3 and a test terminal 4.

[0051] The electrical performance measurement module 1 comprises a source table 101 and a device clamp 102 for clamping a circularly polarized electroluminescent device (not shown in the figure), and the two sides of the source table 101 are connected with the circularly polarized electroluminescent device and the test terminal 4 respectively. The source table 101 is used for continuously providing the circularly polarized electroluminescent device with electrical signals required for testing, and making the circularly polarized electroluminescent device emit divergent light photons, and is also used for transmitting the electrical signals to the test terminal 4.

[0052] The source table 101 can accurately control the intensity and stability of the provided electrical signals to ensure the accuracy and reliability of the test results. The device clamp 102 stably clamps the circularly polarized electroluminescent device, and can control the light emitting position of the circularly polarized electroluminescent device, so that the stability and consistency of the device during the test can be ensured, and the precision of the test is further improved.

[0053] For example, using a Keithley 2450 source meter, the positive and negative terminals of the source meter 101 can be connected to the device clamp 102 through wiring, and the positive and negative terminals of the circularly polarized light emitting device under test can be connected to the device clamp 102 through the device clamp 102, thereby causing the device to light up. At the same time, the Keithley 2450 source meter is connected to the test terminal 4, and the test terminal 4 can directly read the voltage and current information transmitted by the source meter 101.

[0054] The optical performance module 3 includes a first integrating sphere 302 and a first spectrometer 304 connected to the first integrating sphere 302; the first integrating sphere 302 collects the divergent light photons emitted by the circularly polarized light emitting device under test and transmits them to the first spectrometer 304; the first spectrometer 304 is used to detect the first spectral information of the divergent light photons and transmit the first spectral information to the test terminal 4.

[0055] The first integrating sphere 302 has high internal reflection performance, which can effectively collect and converge the divergent light photons emitted by the circularly polarized light emitting device under test, reduce the loss of light photons, and improve the detection accuracy of spectral information. At the same time, the first spectrometer 304 has high sensitivity and high resolution, which can accurately detect and record the spectral information of the divergent light photons, and provide reliable data support for the test terminal 4.

[0056] In a general example, the first integrating sphere 302 communicates with the first spectrometer 304 through an optical fiber bundle.

[0057] The test terminal 4 is used to determine the electrical performance parameters and optical performance parameters of the circularly polarized light emitting device under test according to the electrical signal and the first spectral information, respectively.

[0058] The test terminal 4 can be a computer, or other terminals or servers with the required computing power for electrical and optical performance, which is not limited here.

[0059] In order to measure the electrical performance parameters and optical performance parameters of the circularly polarized light emitting device under test, first, the circularly polarized light emitting device under test is placed on the device clamp 102, and the source meter 101 is connected to continuously provide the electrical signal (voltage) to the device. When a certain voltage is reached, the circularly polarized light emitting device under test emits light, and the brightness of the light emitted by the circularly polarized light emitting device under test gradually increases until the device is damaged. At the same time, the source meter is connected to the computer, and the current and voltage information can be read from the computer software, and the first spectrometer 304 is connected to the computer, and the light spectrum information can be read from the computer software. The current and voltage information can be used to determine the electrical performance parameters of the circularly polarized light emitting device under test, and the light spectrum information can be used to determine the optical performance parameters of the circularly polarized light emitting device under test.

[0060] In the use of the to-be-tested circularly polarized light-emitting device, its electrical performance parameters and optical performance parameters are crucial, which directly reflect the performance of the device. Through the test system provided by the application, the key parameters can be comprehensively and accurately measured, thereby providing strong technical support for the research, production and application of the device.

[0061] It should be noted that in the traditional method, the to-be-tested circularly polarized light-emitting device is usually placed on a spectrometer to measure the electroluminescence spectrum, and then connected to a source table to measure the electrical performance. The embodiment of the application integrates the electrical performance measurement module and the optical performance module, continuously provides the to-be-tested circularly polarized light-emitting device with the electrical signal required for testing through the source table, and transmits the electrical signal to the test terminal, so as to determine the electrical performance parameters of the to-be-tested circularly polarized light-emitting device according to the electrical signal, and collect the divergent light photons of the to-be-tested circularly polarized light-emitting device through the first integrating sphere, and transmit them to the first spectrometer to obtain the luminescence spectrum information of the to-be-tested circularly polarized light-emitting device, and determine the optical performance parameters of the to-be-tested circularly polarized light-emitting device according to the luminescence spectrum information through the test terminal, so as to integrate the electrical performance measurement and the optical performance measurement of the circularly polarized light-emitting device for synchronous measurement, thereby avoiding the process of data calculation and processing being too complicated.

[0062] The detailed process of testing the electrical performance parameters and the optical performance parameters of the to-be-tested circularly polarized light-emitting device based on the structure shown in FIGS. Figure 1 and Figure 2

[0063] In some embodiments, the electrical signal includes a voltage signal and a current signal; the electrical performance parameters include a current density-voltage change curve, a turn-on voltage and a voltage peak value corresponding to a maximum brightness of the device.

[0064] The current density-voltage change curve is a curve describing how the current density flowing through the to-be-tested circularly polarized light-emitting device changes at different voltages. This parameter can reflect the conductivity performance and charge injection efficiency of the device, and is one of the important indicators for evaluating the performance of the device.

[0065] The turn-on voltage refers to the lowest voltage at which the to-be-tested circularly polarized light-emitting device starts to emit light, which reflects the difficulty of starting the device.

[0066] The voltage peak value corresponding to the maximum brightness of the device is the voltage value corresponding to the maximum brightness of the device within a given voltage range, which helps to understand the voltage requirement of the device in the high brightness working state.

[0067] In this case, the test terminal 4 is used to determine the turn-on voltage and the voltage peak value corresponding to the maximum brightness of the device according to the voltage signal.

[0068] ​Wherein, in practical application, the turn-on voltage can be determined by gradually increasing the voltage and observing whether the device starts to emit light. And the voltage peak corresponding to the maximum brightness of the device, under the premise of ensuring the safety of the device, the voltage is adjusted to find the voltage point at which the brightness of the device reaches the maximum. These can be automatically captured by computer software using voltage signals.

[0069] The test terminal 4 is also used to determine the current density of the circularly polarized light emitting device to be tested according to the predetermined light emitting area of the circularly polarized light emitting device to be tested and the current signal, and determine the current density-voltage change curve according to the current density and the voltage signal.

[0070] Wherein, the predetermined light emitting area of the circularly polarized light emitting device to be tested is determined when the circularly polarized light emitting device is made, which has a specific light emitting position, and the area of this light emitting position is determined.

[0071] In practical application, by measuring and recording the current value under different voltages, and combining the light emitting area of the device, the corresponding current density can be calculated, and the current density-voltage change curve, i.e. J-V curve, can be drawn.

[0072] In some embodiments, the optical performance parameter includes a brightness-voltage change curve.

[0073] Wherein, the brightness-voltage change curve is a curve describing how the light emitting brightness of the circularly polarized light emitting device to be tested changes under different voltages. This parameter can intuitively reflect the light emitting efficiency and stability of the device, and is one of the important indicators for evaluating the optical performance of the device.

[0074] In this case, the test terminal 4 is used to determine the light emitting brightness of the circularly polarized light emitting device to be tested according to the first spectral information, and is also used to determine the brightness-voltage change curve according to the light emitting brightness and the voltage signal.

[0075] Wherein, the first spectral information includes the radiant flux entering the first integrating sphere. The light emitting brightness of the circularly polarized light emitting device to be tested is determined as follows:

[0076]

[0077] In the formula, L is the light emitting brightness, is the maximum spectral luminous efficiency, which is a constant, = 638 lm / W, is the radiant flux entering the first integrating sphere, is the photopic spectral luminous efficiency function, which is specified according to experimental values, is the device light emitting area, is the wavelength.

[0078] After obtaining the luminous intensity of the circularly polarized light-emitting device, the test terminal 4 can further draw a luminous intensity-voltage curve, i.e., an L-V curve, according to the luminous intensity and the voltage signal. This curve can clearly show the change trend of the luminous intensity of the device under different voltage driving, and provide an important basis for evaluating the luminous efficiency and stability of the device.

[0079] In some embodiments, the optical performance parameter includes a maximum external quantum efficiency.

[0080] The maximum external quantum efficiency is the maximum value of the efficiency of converting the injected electrons into outward radiation photons, and is one of the key indicators for measuring the luminous efficiency of the device. High external quantum efficiency means that the device can more effectively convert electrical energy into optical energy, thereby improving the luminous efficiency and reducing energy consumption.

[0081] The test terminal 4 is configured to determine the maximum external quantum efficiency according to the first spectral information and the current signal.

[0082] The calculation process of the maximum external quantum efficiency is as follows:

[0083]

[0084] In the formula, I is the injected current of the device, e is the charge of a single electron, h is the Planck constant, and c is the speed of light. The maximum external quantum efficiency is the maximum value of the efficiency of converting the injected electrons into outward radiation photons, and is one of the key indicators for measuring the luminous efficiency of the device. High external quantum efficiency means that the device can more effectively convert electrical energy into optical energy, thereby improving the luminous efficiency and reducing energy consumption. , The number of photons and the number of electrons, respectively, I represents the injected current of the device, e represents the charge of a single electron, h is the Planck constant, and c is the speed of light.

[0085] The electroluminescence asymmetry factor is a key dimensionless parameter for quantifying the degree of chirality (i.e., the difference in intensity of left and right circularly polarized components) of circularly polarized light emitted by a material. It is defined as twice the ratio of the difference between the intensity of left circularly polarized light (IL) and the intensity of right circularly polarized light (IR) to the sum of the two.

[0086] Furthermore, in the prior art, the inventors have discovered that existing measurement systems for measuring the electroluminescence asymmetry factor require testing the luminescence intensity / luminance of the device under different circular polarization states under both left-handed and right-handed filtering conditions. Due to the attenuation of the device's luminescence intensity during the testing process and the presence of numerous artifacts, the measurement data becomes extremely inaccurate. Firstly, neither traditional measurement methods nor commercially available measuring instruments (Jasco CPL-300) can resolve the artifacts in the electroluminescence asymmetry factor measurement caused by the attenuation of the device's luminescence intensity / luminance over testing time. Although commercial measuring instruments (such as the Jasco CPL-300) use photoelastic modulators to improve measurement accuracy, this method still sacrifices measurement time, typically requiring several minutes or even more than ten minutes. The instability of the device's luminous brightness severely affects the comparison of the intensity / luminous brightness of left-handed and right-handed circularly polarized light, thus leading to a decrease in measurement accuracy. Secondly, the traditional method for measuring luminous devices is to measure the asymmetry factor using a quarter-wave plate and a linear polarizer. This method usually requires manual rotation of the quarter-wave plate, and the rotation angle often deviates from the expected value, resulting in very limited measurement accuracy. Finally, in addition to the obvious artifacts mentioned above, there are also artifacts such as spectrometer measurement bias and circular dichroism absorption of optical elements (different absorption intensities for left-handed and right-handed circularly polarized light).

[0087] Artifacts refer to non-real signals appearing in measurement results or images. These signals do not originate from the actual physical characteristics of the target sample or the object being measured, but are false information introduced by defects in the measurement system itself, environmental interference, or data processing errors.

[0088] Furthermore, regarding the synchronization of electrical and optical characteristics measurements of circularly polarized light-emitting devices, neither of the two methods mentioned above can simultaneously measure both electrical and optical characteristics, resulting in an overly cumbersome process for subsequent data calculation and processing.

[0089] Therefore, the process of measuring the electroluminescence asymmetry factor in the embodiments of this application is described below.

[0090] like Figure 3 and Figure 4 As shown, in Figure 1 and Figure 2 Based on the performance testing system of the electro-polarized circularly polarized light-emitting device, a circularly polarized optical path module 2 is added; the optical performance module 3 also includes a second integrating sphere 301 and a second spectrometer 303 connected to the second integrating sphere 301.

[0091] The circular polarization optical path module 2 is used to split the divergent photons emitted by the circularly polarized light-emitting device under test into first linearly polarized light and second linearly polarized light;

[0092] The first linearly polarized light and the second linearly polarized light are transmitted to the first spectrometer 304 and the second spectrometer 303 respectively after passing through the first integrating sphere 302 and the second integrating sphere 301 respectively.

[0093] The first spectrometer 304 and the second spectrometer 303 are used for transmitting the second spectral information and the third spectral information corresponding to the first linearly polarized light and the second linearly polarized light respectively to the test terminal 4.

[0094] The test terminal 4 is used for determining the optical performance parameter of the circularly polarized light emitting device according to the second spectral information and the third spectral information.

[0095] The circularly polarized light path module 2 includes a collimating lens 201, a quarter-wave plate 202, a polarization beam splitter prism 203, a converging lens 204, a converging lens 205 and a mounting seat (not shown in the figure).

[0096] The collimating lens 201, the quarter-wave plate 202 and the polarization beam splitter prism 203 are sequentially arranged along the optical axis.

[0097] The converging lens 204 is arranged on the reflection light path of the polarization beam splitter prism 203 and is arranged opposite to the second integrating sphere 301.

[0098] The converging lens 205 is arranged on the refraction light path of the polarization beam splitter prism 203 and is arranged opposite to the first integrating sphere 302.

[0099] The quarter-wave plate 202 is mounted on the mounting seat and is switched in the first direction or the second direction by rotating the mounting seat.

[0100] Based on the structure as shown in Figure 3 and Figure 4 , the optical performance parameter includes an electroluminescence asymmetry factor; the second spectral information includes the first linearly polarized light luminous flux measured in the first direction and the first linearly polarized light luminous flux measured in the second direction; and the third spectral information includes the second linearly polarized light luminous flux measured in the first direction and the second linearly polarized light luminous flux measured in the second direction.

[0101] The test terminal 4 is used for determining the total first linearly polarized light luminous flux according to the first linearly polarized light luminous flux measured in the first direction and the first linearly polarized light luminous flux measured in the second direction, determining the total second linearly polarized light luminous flux according to the second linearly polarized light luminous flux measured in the first direction and the second linearly polarized light luminous flux measured in the second direction, and determining the electroluminescence asymmetry factor according to the total first linearly polarized light luminous flux and the total second linearly polarized light luminous flux.

[0102] Exemplarily, as shown in Figure 5As shown, the divergent photons (circularly polarized light) emitted by the circularly polarized light emitting device to be measured first pass through the collimating lens 201 to become parallel circularly polarized light, then pass through the quarter-wave plate 202 (at this time, the quarter-wave plate 202 is located in the first direction, i.e., the fast axis direction is +45° with the horizontal plane), the left-handed circularly polarized light becomes vertical linearly polarized light (s-polarized light), and the right-handed circularly polarized light becomes parallel linearly polarized light (p-polarized light), then pass through the polarization beam splitter prism 203, the s-polarized light is reflected, and the p-polarized light is transmitted. Finally, the two linearly polarized lights respectively enter the first integrating sphere 302 and the second integrating sphere 301 through the converging lens 205 and the converging lens 204, so as to be respectively detected by the first spectrometer 304 and the second spectrometer 303, and the first linearly polarized light flux Φ L+ measured in the first direction and the second linearly polarized light flux Φ R+ measured in the first direction are obtained.

[0103] The quarter-wave plate 202 is switched to the second direction by rotating the mounting seat again, i.e., the fast axis position of the quarter-wave plate is -45° with the horizontal plane. At this time, when the circularly polarized light of the circularly polarized light emitting device passes through the quarter-wave plate, the left-handed circularly polarized light becomes parallel linearly polarized light (p-polarized light), and the right-handed circularly polarized light becomes vertical linearly polarized light (s-polarized light). Then, after passing through the polarization beam splitter prism 203 again, the s-polarized light is reflected, and the p-polarized light is transmitted. Finally, the two linearly polarized lights respectively enter the integrating spheres, so as to be detected by the spectrometers, and the first linearly polarized light flux Φ L- measured in the second direction and the second linearly polarized light flux Φ R- measured in the second direction are obtained.

[0104] The rotating mounting seat can be an electric rotating mounting seat of THORLABS, which greatly improves the rotation accuracy compared with a manual rotating quarter-wave plate.

[0105] The first linearly polarized light flux Φ L+ measured in the first direction and the second linearly polarized light flux Φ L- measured in the second direction are added to obtain the total first linearly polarized light flux Φ L , i.e., Φ L =Φ L+ +Φ L- .

[0106] The first linearly polarized light flux Φ R+ measured in the first direction and the second linearly polarized light flux Φ R- measured in the second direction are added to obtain the total second linearly polarized light flux Φ R , i.e., Φ R =Φ R+ +Φ R- .

[0107] Then, the asymmetry factor of electroluminescence is calculated according to the following formula by using computer software:

[0108]

[0109] In the formula, Φ is the luminous flux of the left circularly polarized light, and Φ is the luminous flux of the right circularly polarized light. is the asymmetry factor of electroluminescence.

[0110] In actual numerical reading, the luminous flux at different wavelengths is usually read on a spectrometer, that is, an electroluminescence curve with wavelength as the horizontal coordinate and luminous flux as the vertical coordinate is obtained. Here, the numerical value of the vertical coordinate is usually taken as Φ, and the asymmetry factor of electroluminescence obtained by the final calculation is also usually a curve with wavelength as the horizontal coordinate and the asymmetry factor of electroluminescence as the vertical coordinate, as shown in FIG. 2. Figure 6

[0111] It should be noted that the luminous flux of the left circularly polarized light and the right circularly polarized light is measured twice, which effectively compensates for the artifacts caused by the change in brightness of the circularly polarized light emitting device. The traditional scheme measures the asymmetry factor of electroluminescence by using a quarter-wave plate and a linear polarizer. This method will cause a large difference between the measured luminous flux of the left circularly polarized light and the luminous flux of the right circularly polarized light due to the unstable brightness of the circularly polarized light emitting device, thereby causing artifacts. Compared with the method of using a PEM instead of a quarter-wave plate, the present application also avoids artifacts caused by the change in brightness of the circularly polarized light emitting device due to the long measurement time.

[0112] Based on the same inventive concept, the embodiment of the present application also provides a test method for implementing the above-mentioned electroluminescent circularly polarized light emitting device performance test system.

[0113] The implementation scheme for solving the problem provided by the system is similar to the implementation scheme described in the above method, so the specific limitations in one or more test method embodiments of the electroluminescent circularly polarized light emitting device performance test system provided below can refer to the limitations of the electroluminescent circularly polarized light emitting device performance test system in the above text, which will not be repeated here.

[0114] As shown in FIG. 1, the embodiment of the present application provides an electroluminescent circularly polarized light emitting device performance test system, which comprises: Figure 7 As shown in FIG. 1, the embodiment of the present application provides an electroluminescent circularly polarized light emitting device performance test system, which comprises:

[0115] Step 100: continuously providing the test-required electrical signal for the circularly polarized light emitting device to be tested through the source table, and making the circularly polarized light emitting device to be tested emit divergent light, and transmitting the electrical signal to the test terminal;

[0116] ​Step 200, collecting the divergent light photons emitted by the circularly polarized light emitting device to be tested through the first integrating sphere, transmitting the divergent light photons to the first spectrometer, detecting the first spectrum information of the divergent light photons through the first spectrometer, and transmitting the first spectrum information to the test terminal;

[0117] Step 300, the test terminal determines the electrical performance parameters and the optical performance parameters of the circularly polarized light emitting device to be tested according to the electrical signal and the first spectrum information, respectively.

[0118] In some embodiments, the electrical performance parameters include the current density-voltage change curve, the turn-on voltage and the voltage peak corresponding to the maximum brightness of the device; the optical performance parameters include the brightness-voltage change curve and the maximum external quantum efficiency.

[0119] In this case, the test terminal determines the turn-on voltage and the voltage peak corresponding to the maximum brightness of the device according to the voltage signal.

[0120] According to the predetermined light emitting area of the circularly polarized light emitting device to be tested and the current signal, the current density of the circularly polarized light emitting device to be tested is determined.

[0121] According to the current density and the voltage signal, the current density-voltage change curve is determined.

[0122] The test terminal determines the light emitting brightness of the circularly polarized light emitting device to be tested according to the first spectrum information, and determines the brightness-voltage change curve according to the light emitting brightness and the voltage signal.

[0123] The test terminal determines the maximum external quantum efficiency according to the first spectrum information and the current signal.

[0124] In some embodiments, the circularly polarized light emitting device performance test system further comprises a circularly polarized light path module; the optical performance module further comprises a second integrating sphere and a second spectrometer connected with the second integrating sphere; and the method further comprises:

[0125] The divergent light photons emitted by the circularly polarized light emitting device to be tested are split into first linearly polarized light and second linearly polarized light;

[0126] The first linearly polarized light and the second linearly polarized light are respectively transmitted to the first spectrometer and the second spectrometer after passing through the first integrating sphere and the second integrating sphere;

[0127] The first spectrometer and the second spectrometer respectively transmit the second spectrum information and the third spectrum information corresponding to the first linearly polarized light and the second linearly polarized light to the test terminal;

[0128] The test terminal 4 determines the optical performance parameters of the circularly polarized light emitting device to be tested according to the second spectrum information and the third spectrum information; wherein the optical performance parameters include the electroluminescent asymmetry factor.

[0129] The circularly polarized light path module 2 comprises a collimating lens 201, a quarter-wave plate 202, a polarization beam-splitting prism 203, a converging lens 204, a converging lens 205 and a mounting base;

[0130] The collimating lens 201, the quarter-wave plate 202 and the polarization beam-splitting prism 203 are sequentially arranged along an optical axis;

[0131] The converging lens 204 is arranged on a reflection light path of the polarization beam-splitting prism 203 and is oppositely arranged with the second integrating sphere 301;

[0132] The converging lens 205 is arranged on a refraction light path of the polarization beam-splitting prism 203 and is oppositely arranged with the first integrating sphere 302;

[0133] The quarter-wave plate 202 is mounted on the mounting base, and the quarter-wave plate 202 is switched in the first direction or the second direction by rotating the mounting base.

[0134] The second spectral information comprises a first linearly polarized light flux measured in the first direction and a first linearly polarized light flux measured in the second direction; and the third spectral information comprises a second linearly polarized light flux measured in the first direction and a second linearly polarized light flux measured in the second direction.

[0135] In this case, the test terminal 4 determines a total first linearly polarized light flux according to the first linearly polarized light flux measured in the first direction and the first linearly polarized light flux measured in the second direction;

[0136] The test terminal 4 determines a total second linearly polarized light flux according to the second linearly polarized light flux measured in the first direction and the second linearly polarized light flux measured in the second direction;

[0137] The test terminal 4 determines the electroluminescent asymmetry factor according to the total first linearly polarized light flux and the total second linearly polarized light flux.

[0138] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A system for testing the performance of an electrocircularly polarizing light emitting device, comprising: The system comprises: an electrical performance measurement module (1), an optical performance module (3), and a test terminal (4); the electrical performance measurement module (1) comprises a source table (101) and a device clamp (102) for clamping a circularly polarized light emitting device to be tested, two sides of the source table (101) are connected with the circularly polarized light emitting device to be tested and the test terminal (4) respectively, the source table (101) is used for continuously providing an electrical signal required for testing for the circularly polarized light emitting device to be tested, making the circularly polarized light emitting device to be tested emit divergent light photons, and transmitting the electrical signal to the test terminal (4); the optical performance module (3) comprises a first integrating sphere (302) and a first spectrometer (304) connected with the first integrating sphere (302); the first integrating sphere (302) collects the divergent light photons emitted by the circularly polarized light emitting device to be tested and transmits them to the first spectrometer (304); the first spectrometer (304) is used for detecting first spectral information of the divergent light photons and transmitting the first spectral information to the test terminal (4); the test terminal (4) is used for determining electrical performance parameters and optical performance parameters of the circularly polarized light emitting device to be tested respectively according to the electrical signal and the first spectral information.

2. The system for testing the performance of an electrocircularly polarizing light-emitting device according to claim 1, wherein the electrical signal comprises a voltage signal and a current signal; the electrical performance parameters comprise a current density-voltage change curve, a turn-on voltage, and a voltage peak value corresponding to a maximum brightness of the device; the test terminal (4) is used for determining the turn-on voltage and the voltage peak value corresponding to the maximum brightness of the device according to the voltage signal; and determining a current density of the circularly polarized light emitting device to be tested according to a predetermined light emitting area of the circularly polarized light emitting device to be tested and the current signal; and determining a current density-voltage change curve according to the current density and the voltage signal.

3. The system for testing the performance of an electrocircularly polarizing light-emitting device according to claim 2, wherein the optical performance parameters comprise a brightness-voltage change curve; the test terminal (4) is used for determining a light emitting brightness of the circularly polarized light emitting device to be tested according to the first spectral information, and determining the brightness-voltage change curve according to the light emitting brightness and the voltage signal.

4. The system for testing the performance of an electrocircularly polarizing light-emitting device according to claim 1, wherein the optical performance parameters comprise a maximum external quantum efficiency; the test terminal (4) is used for determining the maximum external quantum efficiency according to the first spectral information and the current signal.

5. The system for testing the performance of an electrocircularly polarizing light-emitting device according to claim 1, wherein The system further comprises a circularly polarized light path module (2); the optical performance module (3) further comprises a second integrating sphere (301) and a second spectrometer (303) connected with the second integrating sphere (301); the circularly polarized light path module (2) is used for splitting the divergent light photons emitted by the circularly polarized light emitting device to be tested into first linearly polarized light and second linearly polarized light; after the first linearly polarized light and the second linearly polarized light pass through the first integrating sphere (302) and the second integrating sphere (301) respectively, they are transmitted to the first spectrometer (304) and the second spectrometer (303) respectively; The first spectrometer (304) and the second spectrometer (303) are respectively used for transmitting second spectrum information and third spectrum information corresponding to the first linearly polarized light and the second linearly polarized light to the test terminal (4) respectively; The test terminal (4) is used for determining the optical performance parameter of the circularly polarized light emitting device to be tested according to the second spectrum information and the third spectrum information.

6. The system for testing the performance of an electrocircularly polarizing light-emitting device according to claim 5, wherein The circularly polarized light path module (2) comprises a collimating lens (201), a quarter-wave plate (202), a polarization beam splitter prism (203), a first converging lens (204), a second converging lens (205) and a mounting seat; The collimating lens (201), the quarter-wave plate (202) and the polarization beam splitter prism (203) are sequentially arranged along an optical axis; The first converging lens (204) is arranged on a reflection light path of the polarization beam splitter prism (203) and is oppositely arranged with the second integrating sphere (301); The second converging lens (205) is arranged on a refraction light path of the polarization beam splitter prism (203) and is oppositely arranged with the first integrating sphere (302); The quarter-wave plate (202) is mounted on the mounting seat, and the quarter-wave plate (202) is switched in a first direction or a second direction by rotating the mounting seat.

7. The system for testing the performance of an electrocircularly polarizing light-emitting device according to claim 6, wherein The optical performance parameter comprises an electroluminescence asymmetry factor; the second spectrum information comprises a first linearly polarized light luminous flux measured in the first direction and a first linearly polarized light luminous flux measured in the second direction; and the third spectrum information comprises a second linearly polarized light luminous flux measured in the first direction and a second linearly polarized light luminous flux measured in the second direction; The test terminal (4) is used for determining a first linearly polarized light luminous flux total amount according to the first linearly polarized light luminous flux measured in the first direction and the first linearly polarized light luminous flux measured in the second direction, determining a second linearly polarized light luminous flux total amount according to the second linearly polarized light luminous flux measured in the first direction and the second linearly polarized light luminous flux measured in the second direction, and determining the electroluminescence asymmetry factor according to the first linearly polarized light luminous flux total amount and the second linearly polarized light luminous flux total amount.

8. A test method applied to the test system for the performance of the electroluminescent circularly polarized light device according to any one of claims 1 to 7, characterized in that, The method comprises: A source table (101) is used for continuously providing an electrical signal required for testing to a circularly polarized light emitting device to be tested, and making the circularly polarized light emitting device to be tested emit divergent photons, and the electrical signal is transmitted to a test terminal (4); A first integrating sphere (302) is used for collecting the divergent photons emitted by the circularly polarized light emitting device to be tested and transmitting the divergent photons to a first spectrometer (304), and the first spectrometer (304) is used for detecting first spectrum information of the divergent photons and transmitting the first spectrum information to the test terminal (4); The test terminal (4) is used for determining electrical performance parameters and optical performance parameters of the circularly polarized light emitting device to be tested according to the electrical signal and the first spectrum information respectively.

9. The test method of the test system for electroluminescence circularly polarized light device performance test according to claim 8, wherein, The electrical performance parameters include current density-voltage change curve, turn-on voltage and voltage peak corresponding to maximum brightness of the device; and the optical performance parameters include brightness-voltage change curve and maximum external quantum efficiency.

10. The test method of the test system for the performance of the electroluminescence circularly polarized device according to claim 8, wherein the test system for the performance of the electroluminescence circularly polarized device further comprises a circularly polarized light path module (2); the optical performance module (3) further comprises a second integrating sphere (301) and a second spectrometer (303) connected with the second integrating sphere (301); and wherein, The method further comprises: splitting the divergent light emitted by the to-be-tested circularly polarized light-emitting device into first linearly polarized light and second linearly polarized light; after the first linearly polarized light and the second linearly polarized light pass through the first integrating sphere (302) and the second integrating sphere (301) respectively, the first linearly polarized light and the second linearly polarized light are transmitted to the first spectrometer (304) and the second spectrometer (303) respectively; the first spectrometer (304) and the second spectrometer (303) transmit second spectral information and third spectral information corresponding to the first linearly polarized light and the second linearly polarized light to the test terminal (4) respectively; the test terminal (4) determines the optical performance parameters of the to-be-tested circularly polarized light-emitting device according to the second spectral information and the third spectral information; wherein the optical performance parameters include electroluminescence asymmetry factor.

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