Engineers share: no-phosphor dual-wavelength white LED analysis

Foreword

White LEDs can be roughly divided into three types according to the way of illumination. Among them, blue LEDs with yellow wavelengths of 410 to 460 nm and yellow phosphors are the most common way to produce white light, and are also the best way of efficiency and mass production. There are a variety of patents, and the production management of the phosphor itself has not yet been established, so it is not easy to produce at a low price.

In addition, the white light method of ultraviolet light + RGB phosphor with wavelength between 365 and 460 nm, and the combination of three light primary colors of RGB can also obtain white light, but the ultraviolet light encapsulation material and peripheral components are exposed to ultraviolet light for a long time. In the light environment, there are degradations, and the RGB method has problems such as wavelength drift and control complexity. Therefore, foreign companies develop dual-wavelength white LEDs.

development path

Figure 1 is a conventional blue LED+phosphor, compared with the package structure of a dual-wavelength white LED. It can be seen from the figure that the dual-wavelength white LED has no need to perform phosphor ratio conversion and content management, and can also completely solve the RGB three-primary LED driving circuit. The problem of brightness, wavelength, and color rendering can be adjusted freely within a certain range.

2 is a comparison of the principle of illumination of a conventional white LED and a dual-wavelength white LED. It can be seen from the figure that a conventional white LED uses a phosphor-coated GaN-based blue chip to obtain white light, and a dual-wavelength white LED uses a single chip to obtain white light.

The basic structure of the dual-wavelength white LED is on the chip unit, and at the same time, blue and yellow-green light are generated, and the blue light and the yellow-green light are mixed at a very short distance to obtain a pseudo white light. The pseudo white light has a high transparency and purity that cannot be achieved by the conventional white LED.

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