Compared with traditional light sources such as incandescent lamps and compact fluorescent lamps, light-emitting diodes ( LEDs ) have many advantages such as high luminous efficiency, long life, and high directivity, and are increasingly favored by the industry and used in the general lighting market. LED lighting applications should be accelerated. In the short term, problems from the cost, technology, and standards must be overcome. The technical aspects, including color temperature, color rendering, and efficiency improvement, still need further improvement. The application of LED in the general lighting market involves many requirements, such as LED light source, power conversion, drive control, heat dissipation and optics.

Thin film chip technology

At present, the key to the development of LED chip technology lies in substrate materials and wafer growth technology. Base Materials In addition to traditional sapphire materials, silicon (Si), silicon carbide (SiC), zinc oxide (ZnO) and gallium nitride (GaN) are also the focus of current research. Whether it's high-power chips for accent lighting and monolithic lighting, or low-power chips for decorative lighting and some simple auxiliary lighting, the key to technological advancement is around how to develop more efficient and stable chips. Therefore, improving the efficiency of LED chips has become the key to improving the overall technical indicators of LED lighting. In just a few years, with the improvement of a series of technologies such as chip structure, surface roughening and multi-quantum well structure design, LED has made a major breakthrough in luminous efficiency. The development of LED chip structure is shown in Figure 1. It is believed that as the technology continues to mature, LED quantum efficiency will be further improved, and the luminous efficiency of LED chips will also increase.

The development history of LED chip structure
Figure 1 Development history of LED chip structure

Thin film technology (Thinfilm) is a key technology for producing ultra-bright LED chips, which can reduce the lateral light loss. More than 97% of the light can be output from the front through the bottom reflection surface (Fig. 2), which not only greatly improves the LED luminous efficiency. Also simple lens design.

Comparison of the front light output ratio of ordinary LED and thin technology LED

Figure 2 Comparison of the front light output ratio of ordinary LED and thin technology LED

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