Refining yellow light single crystal at 2000°C, making white LED lamps last longer
To Professor Wei Dong, the main process of white LED lamps on the market today is to use a blue-emitting chip and a yellow-emitting phosphor. The two use AB glue to emit white light. However, the main problem of this process is that the AB glue that binds the phosphor is easy to age, especially when the lamp is illuminated for a long time, the phosphor of the AB glue can lose the original effect, thereby affecting the illumination of the white LED lamp. The effect, such as the light is not bright enough, the light is blue and so on.
To break through this problem, we must start with a yellow phosphor. In this regard, Professor Wei Dong spent many years working on the yellow light single crystal material, which is produced in a high temperature environment of 2000 ° C, as long as a piece of each LED blue chip is matched (for example, 24 A single light source with a single crystal of 5.5mm × 5.5mm can be used to emit stable white light. Due to the high temperature resistance and good thermal conductivity of the crystal, the LED lamp can be made more durable and has a longer service life, especially for the bulb not being damaged by the high temperature caused by long-time illumination, so it is very suitable for the lamp used in high-end cars. , high-speed rail, aircraft or submarine lighting.
A few days ago, the reporter saw the high-temperature furnace and the yellow crystal production of yellow crystals in Weidong's laboratory. The research has been successful for four or five years, and Weidong is currently negotiating cooperation with related companies. He said that in the production of yellow crystals, by controlling the composition, concentration, thickness, etc. of the crystal, different levels of light and color temperature can be adjusted to meet various needs, and white LED lamps of various lengths and shapes can also be produced. In addition, Weidong has also developed another yellow fluorescent material, which is an alternative material for yellow powder. Compared with yellow crystal, yellow glass is not as durable, but the cost is lower and the production cycle is shorter. Alternative materials have reached the market's technical indicators.