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A white LED modeling method is proposed to implement the colorimetric simulation and a novel LED packaging integrated with a specific freeform lens is designed to realize t he high-quality light outp ut. High angula r color uniformity (ACU) is achieved by mixing the central bluish white light and the marginal yellowish white light via the specific freeform lens. Based on the white LED modeling method,...
Secondary optics design in the past research only considered illuminance uniformity and ignored luminance uniformity and glare issue, which may result in serious security problem for vehicle drivers. A novel un-symmetric freeform LED lens designed for roadway lighting is proposed. Optical performance of un-symmetric lens will be compared with symmetric lens by optical software. The simulation results...
Light emitting diodes (LEDs) hold the promise for efficient, lightweight and environmental-friendly lighting sources, which is regarded as the next-generation lighting technology. Since so many problems still remain to be solved, this emerging technology has attracted the attention of a large number of researchers. Among several issues frequently discussed in the community, the long-time reliability...
As one type of the chip attachment materials, the solder layer inside the light-emitting diode (LED) packages can not only bond the chips to the substrate tightly, but also play the role of thermal interface material (TIM). Therefore, it makes a great influence on the thermal performance LED packages, especially in high density chip-array LED packaging. The solder layer has become one of the dominant...
Among several materials used in LED packaging, phosphor-filled silicone plays an important role on optical performance and long-time reliability of the module. Many researchers have studied optical properties of phosphor, but few have considered mechanical behavior of phosphor-filled silicone. In this paper, mechanical properties of YAG phosphor-filled silicone are obtained. Tensile tests, which are...
In this paper, we analyze the optical features of different LED packaging types in forward-lighting application. There are generally two packaging types: point source and line source. For the two different packaging types, we introduce several high-efficient supporting opticses in forward-lighting application.
In this study, we first analyse the requirements both in optical and thermal aspects in theory. With the results of theoretical analysis, we design the application specific light emitting diode (LED) packaging (ASLP) with optimized structural parameters and choose appropriate packaging materials. According to this design, several samples are made and tested. The test results show that the LED packaging...
In this study, we firstly analyse the requirements both in optical and thermal fields in theory. With the results of theoretical analysis, we design the application specific light emitting diode (LED) packaging (ASLP) with optimized structure parameters and appropriate packaging materials. According to this design, several samples are made and tested. The test results show that the LED packaging can...
Aiming at the the demand of leak detection for thermal sealed plastic bottles in beverage industry, the beverage bottles leak detection control system was researched and designed upon the basis of large number of practical tests,. Taking single-chip ATmega16 as the core processing units, the system used cylinder and pressure sensor to perform detection. Through the data analysis, leakage bottles could...
Traditional LED packaging always adopts hemisphere lens, although which can ensure high light output efficiency, its light beam is of circular symmetry and non-uniformity. Therefore, LED by traditional packaging cannot be applied in lighting directly and bulky secondary lenses have to be used, which will make the traditional lighting companies difficult to switch to LED lighting and the lamps are...
High power white light emitting diodes (LEDs) have begun to play an important role in many illumination applications due to their excellent performance. In this paper, an effective freeform lens design method for extended light source was suggested briefly for the first time and two compact LED packaging freeform lenses, with the material of polycarbonate (PC) and silicone respectively, were designed...
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