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資訊詳細

Color LED with a phosphor innovation yet

浏览次数:354 日期:2011-10-14

In recent years, in light of the most interesting event is the rise of the semiconductor lighting. The mid-1990s, Japan's Nichia Corporation Nakamura, who through unremitting efforts, broke through the manufacture of blue light-emitting diode (LED) of the key technologies, and thus developed a fluorescent material to cover the blue LED technology produces white light source . Semiconductor lighting with green environmental protection, long life, high efficiency, resistance to harsh environments, simple structure, small size, light weight, fast response, low voltage and good security features, so as the incandescent, fluorescent after The third generation of lighting power source, otherwise known as 21st century green light. United States, Japan and Europe have injected a lot of manpower and financial resources, the establishment of specialized agencies to promote the development of semiconductor lighting technology.

There are many ways to achieve white light LED, developed earlier, the way of industrialization has been achieved in the LED chip is coated with phosphor to achieve white light emission.

LED with phosphor There are three main methods to achieve white light, but they are not fully mature, thus seriously affecting the white LED in the lighting field. Specifically, the first method is the blue LED chip coated with yellow phosphor can be excited by blue light, emitted blue chip and yellow phosphor issued complementary form white light. The technology monopolized by the Japanese company Nichia, and this program is a principle of the shortcomings in the phosphor emission spectra of Ce3 + ion is not a continuous spectrum features, the color is poor, it is difficult to meet the requirements of low color temperature light, while light-emitting efficiency is not enough high efficiency through the development of new phosphors to improve.

The second method is a blue LED chip coated with green and red phosphor, blue light emitted by the chip and the issue of green and red phosphor compound to be white, the color is good. However, this method is to use phosphor conversion efficiency is low, especially in the efficiency of red phosphors to be more substantial increase.

The third method is to achieve the violet or ultraviolet LED chip coated with three primary colors or multiple colors of phosphors, the use of the long-wave ultraviolet light emitted by the device (370nm-380nm) or violet (380nm-410nm) to stimulate phosphor to achieve white light emission, the method has better color, but there are also similar problems and the second method, and the current conversion efficiency higher than for the red and green phosphor sulfide system, such phosphors poor stability, the light fades, so the development of efficient, low-light white LED with a phosphor decay has become an urgent task.

Domestic research institutions recently by Taiwan and China joint research partners to develop a variety of uses phosphor color LED.

The use of phosphors to create color LED has the following advantages: First, do not use phosphor, can prepare a red, yellow, green, blue, purple and other colors of the color LED, but because of these different color LED luminous efficiency of a big difference , using the phosphor can be used after some band advantages of high efficiency LED light to prepare the other band of the LED, in order to improve the luminous efficiency of the band. For example, some green band of the LED efficiency is low, the mainland offered Taiwan manufacturers to use a more efficient phosphor prepared, be referred to as "apple green" LED backlight for mobile phones, and achieved good economic benefits.

Secondly, LED light-emitting wavelength is still difficult to precisely control, which may cause some applications, the wavelength of the LED are not a waste, for example, requires the preparation of 470nm LED, it may prepare them is from 455nm to 480nm with a wide range of LED emission wavelength of the LED at both ends of the lower prices can only dispose of or abandoned, while the use of phosphors can be so-called "waste" into the desired color. Third, the use of phosphors, certain LED light color will become more soft or bright, to suit different application needs. Of course, the phosphors in the LED is still the most widely used in the white area, but because of its unique advantages, but also in color LED in certain applications, but the phosphor in the color LED on the application has just started, the need for further in-depth research and development.

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