China's LED standard and testing technology progress

Since June 2003, the Ministry of Science and Technology of China has taken the lead in launching the national semiconductor lighting project. At the beginning, it has attached great importance to the standard research and global design of semiconductor body lighting. The Ministry of Information Industry Standardization Institute, the National Lighting Standardization Technical Committee, and the China Optical Optoelectronics Industry Association The equipment branch, the National Rare Earth Standardization Technical Committee, the National Semiconductor Equipment and Materials Standardization Technical Committee, the China Institute of Metrology, and other organizations and units quickly organized national standardization forces, and invested in the research and standardization of semiconductor body lighting standards, information industry. The Ministry also established a working group on semiconductor lighting technology standards. After the joint efforts of the industry at the end of the "Tenth Five-Year Plan", China's semiconductor body lighting standard system research and standard formulation work has made significant progress, the following standards have been researched, projected, drafted or approved. (1) Relevant standards carried out by the Working Group of Semiconductor Lighting Technology Standards of the Ministry of Information Industry: 1. Test methods for LEDs; 2. Terms and definitions for semiconductor illumination; 3. Epitaxial wafers and chip test methods; 4. Low-power LED blank details Specification; 5. Yellow phosphor for light-emitting diode (LED); (2) Relevant standards carried out by National Lighting Standardization Technical Committee: 1. LED test method for general lighting; 2. Safety requirements for LED components for general lighting; Performance requirements for LED components for lighting; 4. Safety requirements for DC/AC electronic control devices for LED components for general lighting; 5. Performance requirements for DC/AC electronic control devices for LED components for general lighting; 6. Special requirements for connectors for LEDs; 7, LED connector type and size; 8, LED connector gauge; 9, general lighting LED lamps general requirements and tests; 10, LED lighting fixture photometric test; 11, LED lighting system energy-saving evaluation method; Lighting system design specifications; 13, LED decorative lighting system technical specifications; 14, LED night lighting system technical specifications; 15, LED automotive lighting system technical specifications; 16, LED traffic signal indicating system technical specifications; 17, LED backlight lighting system technical specifications; 18, LED night lighting system technical specifications; 19, LED solar lighting system technical specifications; 20, LED Lighting system installation specifications. (3) Relevant standards carried out by the National Rare Earth Standardization Technical Committee: 1. Rare earth yellow phosphors for white LED lamps. Other traditional industries in China are likely to use LEDs in large quantities due to their unique and excellent performance. For example, LCD backlights for color TVs, signal and lighting systems for automobiles, large-screen displays and traffic lights, etc., are bound to be added to the application standard for LEDs. Come. It is not difficult to see from the above that although the standard system research and standard formulation work of semiconductor body lighting in China has made significant progress, there are also obvious problems and contradictions. Repeated project establishment, repeated construction of standards, multiple standards, the loss caused by this situation is not only unnecessary waste caused by repeated construction, but the more serious potential is that small industries and even small groups are their own interests, in their own Inappropriate technical standards are imposed within the scope of influence, and multiple standards exist in large industries, and they are independent. If this happens, our semiconductor lighting standards can not form a complete system, not only can not protect the national industry, but also can not guide the healthy and orderly development of the industry. Management and people of insight in the industry should pay great attention to this. The industry is extremely concerned about the standardization construction of semiconductor lighting in China. The following recommendations are worthy of reference: (1) It must be highly valued, it is the fulcrum of industrial development; (2) The overall unified design, unified coordination, and division into upper, middle and lower reaches industries Close cooperation and participate in the formulation of basic standards; (3) Reasonable division of labor, formulation of professional standards (or product standards), avoiding repeated standards, multiple standards; (4) Standards and testing are inseparable, and standards must be valued at the same time. Corresponding detection technology, testing equipment and testing platform construction; (5) Under the premise of being in line with international standards, consider the protection of China's national industry and the protection of intellectual property rights in China's semiconductor lighting standards. 1. Standard equipment and standard test system measurement and test systems in semiconductor lighting test are required to be calibrated or calibrated by standard instruments or standard test systems (or devices). The more mature a certain test system is technically, its The simpler the calibration is, the longer the amount of time is maintained. In the semiconductor lighting test, the electrical parameter testing equipment technology is easier to implement than the optical testing equipment, and the technology maturity is relatively higher. Therefore, the calibration of the electrical parameters is relatively simple, and the calibration of the optical parameters is relatively complicated, involving Standard appliances and standard test systems are also more complex. In the optical parameter measuring instrument, there is often such a phenomenon. The more the instrument with relatively low technical maturity, the more it needs to be frequently calibrated with a variety of standard instruments, and the object to be tested is required to be similar to the standard instrument; The more mature and advanced the instrument, the closer it is to the calibration standard, and the easier it is to achieve higher measurement accuracy. The standard parameters of standard instruments for low-end instrument calibration are accurately measured by these higher-level instruments.

Figure 1 Two different ways of LED test instrument calibration Take the LED CIE average light intensity measurement as an example. The LED test instrument A with the path calibration shown in Figure 1(a) should have excellent performance. It must strictly meet the CIE condition A or Condition B, the detector aperture must be strictly 1 cm 2 (ie diameter f11.3 mm), strict probe spectral sensitivity response V (λ) correction or weighting, good alignment of the measured LED mechanical axis with the detector optical axis ( Coaxial), good dynamic range and good linear range for such testing

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