Method for distinguishing red copper LED support and brass LED support

Abstract

The invention discloses a method for distinguishing red copper LED supports and brass LED supports, and relates to the technical field of semiconductor devices. According to the invention, the to-be-tested base material support is used as the lamp bead support to prepare the to-be-tested LED lamp bead, and the brightness of the to-be-tested LED lamp bead and the brightness of the reference LED lamp bead are tested under the specific conditions by using the large brightness difference between the brass lamp bead and the red copper lamp bead under the specific test mode, the specific test current and the specific test time. According to the distinguishing method, the brightness of the red copper LED support and the brightness of the brass LED support are compared, the LED supports made of the red copper and the brass LED support can be rapidly and accurately distinguished, quality guarantee is provided for subsequent LED lamp bead preparation, distinguishing can be conducted by means of existing conditions in an LED lamp bead preparation enterprise through the distinguishing method, cost is low, and the distinguishing method is suitable for large-scale popularization and application. The problems of difficulty in accurate distinguishing in traditional naked eye observation and high cost and long time consumption in component analysis of a detection mechanism are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor devices, and particularly to a method for distinguishing LED brackets made of red copper and brass materials. Background Art

[0002] The LED bracket is one of the core components of the LED lamp bead, and is used to support and connect the chip in the LED lamp bead. With the wide application of LED technology, the market demand for LED devices is increasing continuously. However, due to fierce market competition, many companies have started to reduce costs, resulting in a mixed bag of base materials for LED brackets. Red copper and brass are common base materials for brackets. The main differences between the two are the copper content and composition, but their performance differences are significant, especially in terms of thermal conductivity and electrical conductivity. When preparing LED lamp beads, if the wrong base material for the bracket is selected, it is easy to cause the performance of the prepared LED lamp beads to fail to meet the standards, and even seriously lead to the scrapping of the entire batch of LED lamp beads.

[0003] Traditionally, red copper brackets and brass brackets can be distinguished by naked-eye observation. However, with the progress of technology, some processing techniques make the appearances of red copper brackets and brass brackets basically the same, which is likely to deceive our eyes and make it difficult to distinguish these two types of LED brackets with the naked eye. Currently, for red and brass brackets that are difficult to accurately distinguish with the naked eye, it is usually necessary to send them to a testing institution for component analysis. Although sending them to a testing institution for component analysis can accurately distinguish red and brass brackets, the cost is relatively high and the entire process takes a long time. Therefore, there is an urgent need for a method for quickly, accurately, and low-costly distinguishing LED brackets made of red copper and brass materials. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for distinguishing LED brackets made of red copper and brass materials, which can quickly, accurately, and low-costly distinguish LED brackets made of red copper and brass materials, provide quality assurance for the subsequent preparation of LED lamp beads, and avoid the problems of high cost and long time-consuming of the traditional method.

[0005] To solve the above technical problem, the present invention provides a method for distinguishing LED brackets made of red copper and brass materials, including the following steps:

[0006] (1) Using the LED bracket made of known brass material as a reference bracket, and using the reference bracket as the lamp bead bracket to prepare a reference LED lamp bead;

[0007] (2) Using the same lamp bead preparation method as in step (1), and using the bracket with the base material to be tested as the lamp bead bracket to prepare a to-be-tested LED lamp bead;

[0008] (3) In the steady state mode, use a current of ≥100 mA to light the reference LED bead and the LED bead to be tested respectively. At time T1 after lighting the bead, measure the brightness of the reference LED bead and the LED bead to be tested; where T1 = (1 - 5)T 热平衡 , T 热平衡 is the thermal equilibrium duration of the reference LED bead;

[0009] (4) In the pulse mode, use a current of 50 mA - 250 mA to light the reference LED bead and the LED bead to be tested respectively. At time T2 after lighting the bead, measure the brightness of the reference LED bead and the LED bead to be tested; where T2 = (0.05 - 0.5)T 热平衡 ;

[0010] (5) According to the brightness of the reference LED bead and the LED bead to be tested obtained in the steady state mode in step (3), calculate the brightness percentage of the LED bead to be tested and the reference LED bead in the steady state mode, denoted as L 亮度百分比 ; According to the brightness of the reference LED bead and the LED bead to be tested obtained in the pulse mode in step (4), calculate the brightness percentage of the LED bead to be tested and the reference LED bead in the pulse mode, denoted as L' 亮度百分比 ;

[0011] (6) If L 亮度百分比 is 99.9% - 100.1%, and L' 亮度百分比 is 99.9% - 100.1%, then determine that the substrate bracket to be tested is a brass bracket; if L 亮度百分比 > 100.1%, and L' 亮度百分比 < 99.9%, then determine that the substrate bracket to be tested is a red copper bracket.

[0012] As an improvement of the above technical solution, T1 = (1.5 - 3)T 热平衡 ; T2 = (0.05 - 0.3)T 热平衡 .

[0013] As an improvement of the above technical solution, in steps (3) and (4), set the test voltage to be fixed when lighting the reference LED bead and the LED bead to be tested, and the test voltage is 2 - 8V.

[0014] As an improvement of the above technical solution, both the reference LED bead and the LED bead to be tested are of single crystal structure.

[0015] As an improvement of the above technical solution, calculated by mass percentage, the chemical composition of the reference bracket consists of 60% - 68% copper, 32% - 40% zinc, and 0% - 0.5% impurities.

[0016] As an improvement to the above technical solution, in step (3), in the steady state mode, the reference LED lamp bead and the LED lamp bead to be tested are respectively lit with a current of ≥150 mA. At time T1 after the lamp beads are lit, the brightness of the reference LED lamp bead and the LED lamp bead to be tested is measured.

[0017] In step (6), if L 亮度百分比 is 99.9% - 100.1%, and L' 亮度百分比 is 99.9% - 100.1%, then it is determined that the substrate bracket to be tested is a brass bracket; if L 亮度百分比 > 100.6%, and L' 亮度百分比 < 99.9%, then it is determined that the substrate bracket to be tested is a red copper bracket.

[0018] As an improvement to the above technical solution, in step (3), in the steady state mode, the reference LED lamp bead and the LED lamp bead to be tested are respectively lit with a current of 200 mA - 350 mA. At time T1 after the lamp beads are lit, the brightness of the reference LED lamp bead and the LED lamp bead to be tested is measured.

[0019] In step (6), if L 亮度百分比 is 99.9% - 100.1%, and L' 亮度百分比 is 99.9% - 100.1%, then it is determined that the substrate bracket to be tested is a brass bracket; if L 亮度百分比 is 101.5% - 113%, and L' 亮度百分比 < 99.9%, then it is determined that the substrate bracket to be tested is a red copper bracket.

[0020] As an improvement to the above technical solution, in step (4), in the pulse mode, the reference LED lamp bead and the LED lamp bead to be tested are respectively lit with a current of 50 mA - 200 mA. At time T2 after the lamp beads are lit, the brightness of the reference LED lamp bead and the LED lamp bead to be tested is measured.

[0021] As an improvement to the above technical solution, the method for preparing the reference LED lamp bead with the reference bracket as the lamp bead bracket in step (1) includes the following steps:

[0022] Fix the LED chip in the die bonding area of the reference bracket;

[0023] Connect the positive and negative electrodes of the LED chip to the positive and negative electrodes of the reference bracket respectively to form an electrical path;

[0024] Apply glue to the die bonding area of the reference bracket, and after curing, the reference LED lamp bead is obtained.

[0025] As an improvement of the above technical solution, in steps (2) and (4), an integrating sphere is used to measure the brightness of the reference LED lamp bead and the LED lamp bead to be tested.

[0026] Implementing the present invention has the following beneficial effects:

[0027] 1. The present invention uses the substrate bracket to be tested as the lamp bead bracket to prepare the LED lamp bead to be tested. The lamp beads made of brass brackets and the lamp beads made of red copper brackets have a large brightness difference under specific test modes, specific test currents, and specific test times. By measuring the brightness of the LED lamp bead to be tested and the reference LED lamp bead under this specific condition and comparing the brightness of the two, it is possible to quickly and accurately distinguish between LED brackets made of red copper and brass materials, providing quality assurance for the subsequent preparation of LED lamp beads. Moreover, the method of distinguishing between red copper and brass LED brackets in the present invention can be carried out within the LED lamp bead manufacturing enterprise using existing conditions, with low cost, avoiding the problems of difficult accurate discrimination by traditional naked eye observation and the high cost and long time-consuming of sending samples to testing institutions for component analysis.

[0028] 2. Through the dual verification of the steady-state mode and the pulse mode, the accuracy and reliability of distinguishing between red copper and brass LED brackets can be improved.

[0029] 3. The distinguishing method of the present invention has the advantages of simple operation, low cost, and high accuracy rate, and has broad application prospects. Description of the Drawings

[0030] Figure 1 is a brightness comparison diagram of red copper lamp beads and brass lamp beads in the 3V / single crystal / steady-state mode in Embodiment 1 of the present invention;

[0031] Figure 2 is a brightness comparison diagram of red copper lamp beads and brass lamp beads in the 3V / single crystal / pulse mode in Embodiment 1 of the present invention. Detailed Embodiments

[0032] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive.

[0033] For those technical or conditions not specified in the embodiments, they shall be carried out according to the techniques or conditions described in the literature in this field or according to the product specifications. For the raw materials not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0034] The present embodiment discloses a method for distinguishing LED brackets made of red copper and brass materials, comprising the following steps:

[0035] (1) Use an LED bracket made of known brass material as a reference bracket, and use the reference bracket as a lamp bead bracket to prepare a reference LED lamp bead;

[0036] (2) Adopt the same lamp bead preparation method as in step (1), and use the substrate bracket to be tested as a lamp bead bracket to prepare a to-be-tested LED lamp bead;

[0037] (3) In the steady state mode, use a current of ≥100 mA to light the reference LED lamp bead and the to-be-tested LED lamp bead respectively, and the currents used to light the reference LED lamp bead and the to-be-tested LED lamp bead are the same. At time T1 after the lamp beads are lit, measure the brightness of the reference LED lamp bead and the to-be-tested LED lamp bead; wherein, T1 = (1 - 5)T 热平衡 , T 热平衡 is the thermal equilibrium duration of the reference LED lamp bead; specifically, the steady state mode refers to the mode of continuously driving the device to work with a constant current. In the steady state mode, the current is continuous and stable, and the device is in a stable working state;

[0038] (4) In the pulse mode, use a current of 50 mA - 250 mA to light the reference LED lamp bead and the to-be-tested LED lamp bead respectively, and the currents used to light the reference LED lamp bead and the to-be-tested LED lamp bead are the same. At time T2 after the lamp beads are lit, measure the brightness of the reference LED lamp bead and the to-be-tested LED lamp bead; wherein, T2 = (0.05 - 0.5)T 热平衡 ;

[0039] (5) According to the brightness of the reference LED lamp bead and the to-be-tested LED lamp bead obtained in the steady state mode in step (3), calculate the brightness percentage of the to-be-tested LED lamp bead and the reference LED lamp bead in the steady state mode, denoted as L 亮度百分比 ; According to the brightness of the reference LED lamp bead and the to-be-tested LED lamp bead obtained in the pulse mode in step (4), calculate the brightness percentage of the to-be-tested LED lamp bead and the reference LED lamp bead in the pulse mode, denoted as L' 亮度百分比 ;

[0040] (6) If L 亮度百分比 is 99.9% - 100.1%, and L' 亮度百分比 is 99.9% - 100.1%, then determine that the substrate bracket to be tested is a brass bracket; if L 亮度百分比 > 100.1%, and L' 亮度百分比 < 99.9%, then determine that the substrate bracket to be tested is a red copper bracket.

[0041] It should be noted that in the present invention, the substrate holder to be tested is used as the lamp bead holder to prepare the LED lamp beads to be tested. The lamp beads made of brass holders and the lamp beads made of red copper holders have a large brightness difference under specific test modes, specific test currents and specific test times. By testing the brightness of the LED lamp beads to be tested and the brightness of the reference LED lamp beads under specific conditions and comparing the brightness of the LED lamp beads to be tested with the brightness of the reference LED lamp beads, it is possible to quickly and accurately distinguish the LED holders made of red copper and brass, providing quality assurance for the subsequent preparation of LED lamp beads. Moreover, the method for distinguishing the LED holders made of red copper and brass in the present invention can be carried out within the LED lamp bead manufacturing enterprise using the existing conditions, with low cost. The present invention provides a method for distinguishing the LED holders made of red brass with simple operation, rapidity, accuracy and low cost, avoiding the problem that it is difficult to accurately distinguish by traditional naked-eye observation and the problems of high cost and long time consumption of sending samples to testing institutions for component analysis.

[0042] Furthermore, it should be noted that the present invention adopts a combination of a steady-state mode and a pulse mode to conduct brightness comparison of the LED lamp beads to be tested and the reference LED lamp beads respectively under the dual modes, playing a role of double verification, effectively improving the accuracy rate of distinguishing the red copper holder and the brass holder, and ensuring the reliability of the distinguishing result.

[0043] It should be pointed out that the thermal equilibrium time is the time required for the lamp bead to reach a stable state from being lit. The thermal equilibrium time (T 热平衡 ) of the reference LED lamp bead is generally 1 to 15 minutes, and the thermal equilibrium time of the reference LED lamp bead varies under different drive currents. Before testing the brightness of the lamp bead, the thermal equilibrium time of the reference LED lamp bead under different currents (10 mA, 50 mA, 100 mA, 150 mA, 200 mA, 250 mA, 300 mA, 350 mA) can be tested and recorded first, which is beneficial to the subsequent rapid testing of the brightness of the lamp bead.

[0044] Specifically, in step (5), the calculation formula for the brightness percentage (L 亮度百分比 ) of the LED lamp bead to be tested and the reference LED lamp bead under the steady-state mode is as follows: L 亮度百分比 =(brightness of the LED lamp bead to be tested under the steady-state mode / brightness of the reference LED lamp bead under the steady-state mode)×100%. The calculation formula for the brightness percentage (L') 亮度百分比 of the LED lamp bead to be tested and the reference LED lamp bead under the pulse mode is the same by analogy.

[0045] Specifically, the red copper holder is an LED holder made of red copper. Red copper is also known as pure copper, which is relatively pure copper with a copper content ≥99% and an impurity content less than 1%. The brass holder is an LED holder made of brass. Brass is an alloy mainly composed of copper and zinc.

[0046] In some embodiments, T1 = (1.5 to 3)T 热平衡 ; T2 = (0.05 to 0.3)T 热平衡 .

[0047] In some embodiments, by mass percentage, the chemical composition of the reference bracket includes 60% - 68% copper (Cu), 32% - 40% zinc (Zn), and 0% - 0.5% impurities. Among them, the impurities include Fe, Pb, etc., and the content ≤ 0.5%.

[0048] In some alternative embodiments, the material of the reference bracket can be H62 brass or H65 brass. By mass percentage, the chemical composition of H62 brass consists of 60% - 63% copper, 37% - 40% zinc, and 0% - 0.5% impurities (such as Fe, Pb, etc.); the chemical composition of H65 brass consists of 63% - 68% copper, 32% - 37% zinc, and 0% - 0.3% impurities (such as Fe, Pb, etc.).

[0049] In some embodiments, in step (3), in the steady-state mode, use a current of ≥150 mA to light the reference LED bead and the LED bead to be tested respectively. At time T1 after lighting the beads, measure the brightness of the reference LED bead and the LED bead to be tested;

[0050] In step (6), if L 亮度百分比 is 99.9% - 100.1%, and L' 亮度百分比 is 99.9% - 100.1%, then determine that the substrate bracket to be tested is a brass bracket; if L 亮度百分比 > 100.6%, and L' 亮度百分比 < 99.9%, then determine that the substrate bracket to be tested is a red copper bracket.

[0051] It is verified through experiments that in the steady-state mode and with a current of ≥150 mA, the brightness difference between the LED beads made of brass brackets and the LED beads made of red copper brackets is relatively large, and the brightness contrast is more obvious. Therefore, performing brightness tests under this condition makes the distinction between red copper brackets and brass brackets more accurate, which is conducive to improving the resolution accuracy.

[0052] More preferably, in step (3), in the steady-state mode, use a current of 200 mA - 350 mA to light the reference LED bead and the LED bead to be tested respectively. At time T1 after lighting the beads, measure the brightness of the reference LED bead and the LED bead to be tested;

[0053] In step (6), if L 亮度百分比 is 99.9% - 100.1%, and L'亮度百分比 is 99.9% to 100.1%, then it is determined that the substrate bracket to be tested is a brass bracket; if L 亮度百分比 is 101.5% to 113%, then it is determined that the substrate bracket to be tested is a red copper bracket.

[0054] Through further experimental verification, it is obtained that under the steady-state mode and a current of 200 mA to 350 mA, the brightness difference between the LED lamp beads made of a brass bracket and the LED lamp beads made of a red copper bracket is greater, and the brightness contrast is more obvious. Therefore, lighting the reference LED lamp bead and the LED lamp bead to be tested under this condition and testing the brightness can further improve the accuracy of distinguishing between red and brass brackets.

[0055] In some embodiments, in step (4), in the pulse mode, a current of 50 mA to 200 mA is used to light the reference LED lamp bead and the LED lamp bead to be tested respectively. At time T2 after lighting the lamp beads, the brightness of the reference LED lamp bead and the LED lamp bead to be tested is tested.

[0056] Through experimental verification, it is obtained that in the pulse mode, using a current of 50 mA to 200 mA to light the LED lamp beads made of a brass bracket and the LED lamp beads made of a red copper bracket respectively, at this time the brightness difference between the LED lamp beads made of a brass bracket and the LED lamp beads made of a red copper bracket is greater and easier to distinguish. Therefore, lighting and testing the brightness of the reference LED lamp bead and the LED lamp bead to be tested under this condition can further improve the accuracy of distinguishing between red and brass brackets.

[0057] In one embodiment, in steps (3) and (4), when lighting the reference LED lamp bead and the LED lamp bead to be tested, the test voltage is set to be fixed, both being 2 to 8 V.

[0058] When performing the brightness test of the lamp beads, the reference LED lamp bead and the LED lamp bead to be tested are tested with the same voltage, which can ensure the consistency of the test conditions, avoid the influence of voltage fluctuation on the test results, and further improve the accuracy of distinguishing the LED brackets made of red copper and brass.

[0059] In some embodiments, the voltages for the brightness test are 2 V, 3 V, 5 V, 6 V, 8 V, but not limited thereto.

[0060] In one embodiment, both the reference LED lamp bead and the LED lamp bead to be tested are of single crystal structure.

[0061] Specifically, when conducting the brightness test of the LED beads, both the reference LED bead and the LED bead to be tested are of single-crystal structure, that is, the bead uses a single LED chip, which can reduce the preparation difficulty and complexity of the bead, is beneficial to improving the efficiency of distinguishing LED brackets made of red copper and brass materials, and avoids the test errors that may be brought by the polycrystalline structure, further improving the accuracy of the brightness test, and then enhancing the accuracy of distinguishing red and brass brackets.

[0062] In one embodiment, in steps (3) and (4), the integrating sphere method is used to test the brightness of the reference LED bead and the LED bead to be tested. Using the integrating sphere method to test the brightness of the LED bead is a high-precision and widely used test method. The integrating sphere is a hollow sphere with an inner wall coated with a white diffuse reflection material, which can uniformly reflect and scatter light, provide a stable test environment, and ensure the accuracy and repeatability of the test results.

[0063] Specifically, the methods for preparing the beads in steps (1) and (2) of the present invention are the same and are well-known methods.

[0064] Preferably, in step (1), the method for preparing the reference LED bead with the reference bracket as the bead bracket includes the following steps:

[0065] Die bonding: Fix the LED chip in the die bonding area of the reference bracket;

[0066] Wire bonding: Connect the positive and negative electrodes of the LED chip to the positive and negative electrodes of the reference bracket respectively to form an electrical path;

[0067] Dispensing: Dispense the die bonding area of the reference bracket, and the reference LED bead is obtained after curing.

[0068] It should be noted that the method for preparing the LED bead to be tested in step (2) is the same as that in step (1), and the materials used in the die bonding, wire bonding and dispensing steps are also exactly the same. This ensures the consistency of the reference LED bead and the LED bead to be tested, avoids the influence of the preparation process difference on the brightness test result, further improves the accuracy of the brightness test, and then enhances the precision of distinguishing red and brass brackets.

[0069] The technical solution of the present invention will be further described below through embodiments.

[0070] Example 1

[0071] This example conducts experiments on the influence of red copper brackets and brass brackets on the brightness of LED beads, including the following steps:

[0072] (1) Select samples of brackets made of known brass and red copper materials respectively, match the same base glue, chips, wires, phosphors and glue, and use the same method for die bonding, wire bonding and dispensing to prepare lamp beads, obtaining brass lamp beads and red copper lamp beads (that is, ensuring that other materials of the lamp beads are exactly the same, only the copper materials of the brackets are different); among them, both the brass bracket and the red copper are provided with bowl cups for installing chips, and the method for preparing lamp beads includes the following steps:

[0073] Die bonding: Fix the LED chip at the bottom of the bowl cup of the bracket with die bonding base glue through a die bonding device;

[0074] Wire bonding: Connect the positive and negative electrodes of the LED chip to the positive and negative electrodes of the bracket respectively with alloy wires through a wire bonding device to form an electrical path and make the lamp bead conduct normally;

[0075] Dispensing: Pour the colloid mixed with phosphor and glue into the bowl cups of the brackets that have been die bonded and wire bonded by a dispenser, and after curing, obtain brass lamp beads and red copper lamp beads respectively;

[0076] (2) Peel the completed lamp bead samples from the brackets one by one, and test the thermal equilibrium time of the lamp bead samples made of brass brackets at different currents (10 mA, 50 mA, 100 mA, 150 mA, 200 mA, 250 mA, 300 mA, 350 mA) in the 3V / steady state mode. The results are shown in Table 1 below:

[0077] Table 1 Thermal equilibrium time of lamp bead samples made of brass brackets at different currents

[0078] Current 10 mA 50 mA 100 mA 150 mA 200 mA 250 mA 300 mA 350 mA Thermal equilibrium duration 1.3 min 2.7 min 4.5 min 6.8 min 9.2 min 12.1 min 14.6 min 17.1 min

[0079] (3) Place the lamp bead samples on an integrating sphere for brightness testing (integrating sphere: spherical, with a small opening, clamp the lamp beads with a test fixture and place them at the small opening of the integrating sphere to light and test, the integrating sphere collects optical parameter information and uploads it to the computer, and the computer displays the parameters of the lamp beads);

[0080] (4) Set the test voltage (3V) to be fixed, and light the lamp beads according to different test modes (steady state mode or pulse mode) and different currents (10 mA, 50 mA, 100 mA, 150 mA, 200 mA, 250 mA, 300 mA, 350 mA), and corresponding different optical parameter data will appear, including lamp bead brightness, power, etc.;

[0081] (5) Test the red copper lamp beads and brass lamp beads respectively. In the steady state mode, collect the optical parameter data of the lamp beads at time point T1 (in this embodiment, T1 = 2T 热平衡 ) ; In the pulse mode, collect the optical parameter data of the lamp beads at time point T2 (in this embodiment, T2 = 0.1T 热平衡) The optical parameter data will be classified and summarized for the separately tested lamp bead data, and a lamp bead test standard operating procedure SOP document will be created as the reference standard.

[0082] Among them, under the 3V / single crystal / steady state mode, the detailed optical parameter data obtained from testing red copper lamp beads and brass lamp beads are shown in Table 2 below, and the specific brightness comparison data are shown in Table 3 below. The brightness comparison diagram is as Figure 1 shown; under the 3V / single crystal / pulse mode, the detailed optical parameter data obtained from testing red copper lamp beads and brass lamp beads are shown in Table 4 below, and the specific brightness comparison data are shown in Table 5 below. The brightness comparison diagram is as Figure 2 shown.

[0083] Table 2 Optical Parameter Data of Lamp Beads under 3V / Single Crystal / Steady State Mode

[0084] Copper type IF (mA) VF (V) Power (w) Luminous efficacy (lm / w) x y Tc (K) Ra R9 Φ (lm) Brightness contrast Brass 10.00 2.65 0.03 206.13 0.3107 0.3260 6646 86.53 29.62 5.46 100.00％ Copper 10.00 2.65 0.03 205.60 0.3100 0.3240 6708 86.73 30.58 5.45 99.71％ Brass 50.00 2.83 0.14 180.93 0.3120 0.3271 6560 86.27 23.57 25.60 100.00％ Copper 50.00 2.83 0.14 180.23 0.3114 0.3253 6615 86.37 24.43 25.49 99.57％ Brass 100.00 2.98 0.30 156.57 0.3118 0.3262 6578 86.06 21.73 46.73 100.00％ Copper 100.00 2.99 0.30 157.36 0.3115 0.3249 6614 86.02 22.18 47.03 100.64％ Brass 150.20 3.11 0.47 137.58 0.3112 0.3249 6627 86.05 21.52 64.27 100.00％ Copper 150.20 3.12 0.47 139.22 0.3110 0.3239 6648 85.91 21.61 65.20 101.45％ Brass 200.10 3.22 0.64 119.70 0.3095 0.3224 6746 86.40 23.34 77.07 100.00％ Copper 200.10 3.23 0.65 123.62 0.3102 0.3224 6711 86.02 22.19 80.02 103.82％ Brass 250.09 3.32 0.83 104.03 0.3076 0.3199 6884 86.83 25.54 86.48 100.00％ Copper 250.03 3.34 0.84 108.80 0.3086 0.3201 6829 86.37 24.00 90.90 105.10％ Brass 300.10 3.42 1.03 88.02 0.3047 0.3165 7114 87.45 29.18 90.41 100.00％ Copper 300.10 3.45 1.03 96.14 0.3072 0.3182 6938 86.75 25.72 99.42 109.97％ Brass 350.17 3.53 1.24 75.13 0.3021 0.3140 7321 87.84 32.30 92.84 100.00％ Copper 350.16 3.55 1.24 82.98 0.3048 0.3155 7126 87.34 28.89 103.03 110.97％

[0085] Table 3 Brightness Comparison Data of Lamp Beads under 3V / Single Crystal / Steady State Mode

[0086] 10 mA 50 mA 100 mA 150 mA 200 mA 250 mA 300 mA 350 mA Brass (brightness reference) 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ Copper (brightness contrast) 99.71％ 99.57％ 100.64％ 101.45％ 103.82％ 105.10％ 109.97％ 110.97％

[0087] Specifically, it can be seen from Table 2 and Table 3 that under the 3V / single crystal / steady state mode, when the lamp beads are lit with currents of 100mA, 150mA, 200mA, 250mA, 300mA, and 350mA, the brightness of the red copper lamp beads is greater than that of the brass lamp beads. And under this test condition, as the current increases, the brightness contrast between the red copper lamp beads and the brass lamp beads becomes more obvious. At the same time, from Figure 1 the brightness comparison diagram in the steady state mode, it can be seen that at 75mA, the brightness of the red copper lamp beads exceeds that of the brass lamp beads.

[0088] Therefore, based on the above conclusions, when it is known that one of the two LED brackets is a brass bracket and the other is a red copper bracket, but it is not certain which one is the brass bracket and which one is the red copper bracket, the two brackets can be made into lamp beads using the same process, and then under the steady state mode test, the lamp beads are lit with a current > 75mA. The lamp bead with higher brightness is the one made of the red copper bracket, and the lamp bead with lower brightness is the one made of the brass bracket. Thus, the red copper bracket and the brass bracket can be distinguished and verified.

[0089] In addition, according to the above conclusion, when testing the bracket samples made of unknown red brass material, brackets made of known brass material or red copper material can be selected as reference brackets to prepare lamp beads as reference LED lamp beads. By comparing the brightness of the lamp beads made of the bracket of unknown red brass material with that of the reference LED lamp beads, the brackets made of red brass material can be distinguished. For example, a bracket made of known brass material can be selected as the reference bracket to prepare the reference LED lamp beads. Then, the bracket of the unknown red brass material to be tested is made into the LED lamp beads to be tested using the same materials and processes as the reference bracket. Under the 3V / single crystal / steady state mode, the lamp beads are lit with a current greater than 75mA, and the brightness of the reference LED lamp beads and the LED lamp beads to be tested under this condition is measured. Taking the brightness of the reference LED lamp beads as the reference, the brightness of the LED lamp beads to be tested is compared with that of the reference LED lamp beads. If the brightness of the LED lamp beads to be tested is equal to or very close to that of the reference LED lamp beads under this condition, it can be determined that the bracket of the material to be tested is a brass bracket. If the brightness of the LED lamp beads to be tested is greater than that of the reference LED lamp beads under this condition and there is a certain brightness difference, it can be determined that the bracket of the material to be tested is a red copper bracket.

[0090] Table 4 Optical parameter data of lamp beads under 3V / single crystal / pulse mode

[0091] Copper type IF (mA) VF (V) Power (w) Luminous efficacy (lm / w) x y Tc (K) Ra R9 Φ (lm) Brightness contrast Brass 10.00 2.64 0.03 188.70 0.3086 0.3226 6799 86.61 28.76 4.97 100.00％ Copper 10.00 2.64 0.03 188.54 0.3081 0.3211 6846 86.72 29.12 4.97 99.96％ Brass 49.99 2.82 0.14 167.38 0.3110 0.3253 6635 86.20 21.11 23.63 100.00％ Copper 49.99 2.82 0.14 166.78 0.3103 0.3234 6695 86.36 22.46 23.51 99.49％ Brass 100.00 3.00 0.30 147.63 0.3120 0.3266 6563 85.62 17.22 44.25 100.00％ Copper 100.00 2.99 0.30 147.06 0.3113 0.3246 6623 85.74 18.47 44.00 99.43％ Brass 150.17 3.14 0.47 131.12 0.3118 0.3273 6572 85.21 14.10 61.91 100.00％ Copper 150.20 3.13 0.47 130.69 0.3111 0.3254 6633 85.33 15.40 61.55 99.42％ Brass 200.09 3.28 0.66 118.69 0.3119 0.3274 6563 84.98 13.04 77.80 100.00％ Copper 200.08 3.27 0.65 118.41 0.3111 0.3254 6628 85.06 14.21 77.43 99.52％ Brass 249.99 3.40 0.85 108.68 0.3107 0.3238 6661 84.91 13.67 92.30 100.00％ Copper 249.99 3.39 0.85 108.71 0.3100 0.3219 6728 84.95 14.81 92.13 99.82％ Brass 300.00 3.51 1.05 99.26 0.3106 0.3236 6673 84.93 13.61 104.49 100.00％ Copper 300.00 3.50 1.05 99.45 0.3099 0.3217 6738 84.95 14.67 104.50 100.01％ Brass 350.09 3.62 1.27 90.31 0.3101 0.3230 6705 85.13 14.26 114.34 100.00％ Copper 350.12 3.61 1.26 90.60 0.3095 0.3212 6765 85.13 15.28 114.54 100.17％

[0092] Table 5 Brightness comparison data of lamp beads under 3V / single crystal / pulse mode

[0093] 10 mA 50 mA 100 mA 150 mA 200 mA 250 mA 300 mA 350 mA Brass (brightness reference) 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ Copper (brightness contrast) 99.96％ 99.49％ 99.43％ 99.42％ 99.52％ 99.82％ 100.01％ 100.17％

[0094] Specifically, as can be seen from Table 4 and Table 5, when the brightness test is carried out under the 3V / single crystal / pulse mode and the lamp beads are lit with currents of 50mA, 100mA, 150mA, 200mA, and 250mA, the brightness of the red copper lamp beads is less than that of the brass lamp beads. Especially when the lamp beads are lit with currents of 50mA to 200mA, the brightness difference between the red copper lamp beads and the brass lamp beads is larger and the comparison is more obvious. Therefore, under the 3V / single crystal / pulse mode, the lamp beads can be lit with currents of 50mA to 250mA. The lamp beads with higher brightness are the lamp beads made of brass brackets, and the lamp beads with lower brightness are the lamp beads made of red copper brackets. Thus, the red copper brackets and the brass brackets can be distinguished and verified.

[0095] In practical applications, a known brass bracket can be used as a reference bracket. The brightness of the lamp beads made from the reference bracket and the lamp beads made from an unknown red brass bracket are tested respectively. Taking the brightness of the lamp beads made from the reference bracket as the reference, the brightness of the lamp beads made from the unknown red brass bracket is compared with the reference brightness. If, under this condition, the brightness of the lamp beads made from the unknown red brass bracket is less than that of the lamp beads made from the reference bracket and there is a certain brightness difference, it is determined that the unknown red brass bracket is a red copper bracket; if the brightness of the two is equal or very close, it can be determined that the unknown red brass bracket is a brass bracket. Thus, the distinction / verification between the red copper bracket and the brass bracket is achieved. Moreover, the brightness test results in the 3V / single crystal / pulse mode can be combined with the brightness test results in the 3V / single crystal / steady state mode to further improve the accuracy of the distinction results.

[0096] In addition, as can be seen from Table 5 and Figure 2 it can be seen that at 300 mA, the brightness of the red copper lamp beads exceeds that of the brass lamp beads. Therefore, when distinguishing between the red copper bracket and the brass bracket, the lamp beads can also be lit with a current > 300 mA. The bracket with higher brightness is the red copper bracket, and the bracket with lower brightness is the brass bracket. In practical applications, the above method can be adopted, and a bracket of one of the known materials can be selected as the reference bracket to achieve the purpose of distinguishing between the red copper bracket and the brass bracket through brightness comparison.

[0097] In summary, through the comparative analysis of the test data, this embodiment provides reliable data support for distinguishing between the red copper bracket and the brass bracket.

[0098] The above-disclosed is only a preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A method for distinguishing between copper and brass LED brackets, characterized in that: The steps include: (1) Using an LED bracket of known brass material as a reference bracket, and using the reference bracket as a lamp bead bracket to prepare a reference LED lamp bead; (2) using the same lamp bead preparation method as step (1) to prepare the LED lamp bead to be tested using the substrate support to be tested as the lamp bead support; (3) In steady-state mode, use a current of ≥100mA to light up the reference LED lamp bead and the LED lamp bead to be tested respectively. When the time after the lamp bead is lit is T1, test the brightness of the reference LED lamp bead and the LED lamp bead to be tested; where T1 = (1 to 5)T 热平衡 , T 热平衡 It is the thermal equilibrium time of the benchmark LED lamp bead in steady-state mode; (4) In pulse mode, use a current of 50mA to 250mA to light up the reference LED lamp bead and the LED lamp bead to be tested respectively. When the time after the lamp bead is lit is T2, test the brightness of the reference LED lamp bead and the LED lamp bead to be tested; where T2 = (0.02 to 0.5)T 热平衡 ; (5) According to the brightness of the reference LED lamp bead and the brightness of the LED lamp bead to be tested obtained in step (3) in the steady-state mode, calculate the brightness percentage of the LED lamp bead to be tested and the reference LED lamp bead in the steady-state mode, recorded as L 亮度百分比 According to the brightness of the reference LED lamp bead and the brightness of the LED lamp bead to be tested in the pulse mode obtained in step (4), the brightness percentage of the LED lamp bead to be tested and the reference LED lamp bead in the pulse mode is calculated, and recorded as L' 亮度百分比 ; (6) If L 亮度百分比 is 99.9% to 100.1%, and L' 亮度百分比 If L is 99.9% to 100.1%, it is judged that the substrate bracket to be tested is a brass bracket; 亮度百分比 >100.1%, and L' 亮度百分比 <99.9%, it is judged that the substrate bracket to be tested is a red copper bracket.

2. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: T1=(1.5~3)T 热平衡 ;T2=(0.02~0.2)T 热平衡 。 3. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: In step (3) and step (4), a test voltage is set to be fixed when lighting the reference LED lamp bead and the LED lamp bead to be tested, and the test voltage is 2 to 8V.

4. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: The reference LED lamp bead and the LED lamp bead to be tested are both single crystal structures.

5. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: Calculated by mass percentage, the chemical composition of the reference bracket consists of 60% to 68% copper, 32% to 40% zinc and 0% to 0.5% impurities.

6. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: In step (3), in a steady-state mode, the reference LED lamp bead and the LED lamp bead to be tested are respectively lit with a current of ≥150 mA, and the brightness of the reference LED lamp bead and the LED lamp bead to be tested is tested at a time T1 after the lamp bead is lit; In step (6), if L 亮度百分比 is 99.9% to 100.1%, and L' 亮度百分比 If L is 99.9% to 100.1%, it is determined that the substrate support to be tested is a brass support; 亮度百分比 >100.6%, and L' 亮度百分比 <99.9%, it is judged that the substrate support to be tested is a red copper support.

7. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: In step (3), in a steady-state mode, the reference LED lamp bead and the LED lamp bead to be tested are respectively lit up with a current of 200 mA to 350 mA, and the brightness of the reference LED lamp bead and the LED lamp bead to be tested is tested at a time T1 after the lamp bead is lit up; In step (6), if L 亮度百分比 is 99.9% to 100.1%, and L' 亮度百分比 If L is 99.9% to 100.1%, it is determined that the substrate support to be tested is a brass support; 亮度百分比 is 101.5% to 113%, and L' 亮度百分比 <99.9%, it is judged that the substrate support to be tested is a red copper support.

8. The method for distinguishing between copper and brass LED brackets according to claim 1, 4 or 5, characterized in that: In step (4), in pulse mode, use a current of 50mA to 200mA to light up the reference LED lamp bead and the LED lamp bead to be tested respectively, and when the time is T2 after the lamp bead is lit, test the brightness of the reference LED lamp bead and the LED lamp bead to be tested.

9. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: In step (1), the method for preparing a reference LED lamp bead using a reference bracket as a lamp bead bracket comprises the following steps: Fix the LED chip on the die-bonding area of ​​the reference bracket; Connect the positive and negative electrodes of the LED chip to the positive and negative electrodes of the reference bracket to form an electrical path; Glue is dispensed on the die-bonding area of ​​the reference bracket, and after curing, a reference LED lamp bead is obtained.

10. The method for distinguishing between copper and brass LED brackets according to claim 1, characterized in that: In step (3) and step (4), the brightness of the reference LED lamp bead and the LED lamp bead to be tested is tested using an integrating sphere method.

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