LED and OLED as a new type of semiconductor lighting technology, known as the fourth generation of lighting or green light source, compared to traditional lighting products, it has energy saving, environmental protection, long life, small size, can be widely used in a variety of instructions , Display, decoration, backlight, general lighting and city night and other fields.
Therefore, in recent years, some economically developed countries in the world are actively developing LED and OLED semiconductor lighting. However, LED and OLED due to the working principle and the production process is different, there are their own characteristics.
LED full name is a light-emitting diode, generally use III-IV inorganic semiconductor materials and chemical vapor deposition (CVD) process manufacturing. As with the traditional semiconductor industry, the cost of the process is high, it is difficult to achieve large size. Therefore, the LED can only be applied in the form of point light sources. In the field of indoor general lighting, in order to achieve a certain degree of space lighting brightness, LED needs a high luminous brightness, so in order to prevent glare, produce soft light, LED often have to install the lampshade use. But this way, LED lighting luminous efficiency will also decline.
If you want to use LED to produce surface light source, such as LCD backlight, you need to combine multiple LEDs and with a light guide plate and other complex optical system. In addition, the luminous efficiency of the LED will drop sharply as the temperature increases.
As the LED volume is very small, the heat generated when the operation is difficult to spread out in time, it is necessary for the LED lamps equipped with cooling devices. Based on the above reasons, LED light source technology advantages such as luminous efficiency, light and cost advantages, in the production of lamps will be greatly discounted.
At present, white LED is generally used to cover the use of blue LED phosphor way (as shown). Phosphor powder by the blue light emitted by the LED will produce yellow light, and then together with the blue light blue LED mixed with white light. Although this approach is low cost, but there are many shortcomings.
On the one hand, this method produces a white light color index is not ideal, that this kind of white light under the object color will be biased, making it unsuitable for applications where the color quality requirements higher; the other hand, phosphorescence Faster than the blue LED aging, will lead to the white light to the blue drift, and thus shorten the life.
OLED full name is organic light-emitting devices, as the name suggests, OLED is based on organic semiconductor materials produced by the device. OLED materials used in small molecules and high molecular points, the current industrialization of the main small molecules mainly organic materials.
As the use of small molecular OLED low cost glass as a substrate to a large area of vacuum thermal deposition process of manufacturing, so OLED is a natural surface light source technology. OLED process technology without LED process technology of ultra-high vacuum and high temperature environment, cost competitiveness is much higher.
Organic materials are theoretically much lower than inorganic semiconductors, but are currently limited to factors such as industrial scale and material utilization in production. The cost of organic materials is still high. However, with the expansion of industrial scale, the cost of organic materials will be significantly reduced.
OLEDs generally light evenly and soft, close to the lambert (lambert) radiation distribution, so OLED itself is almost a lamp, without the use of shade. At present, the white OLED mainly red and green (yellow) blue three basic colors of organic materials in turn stacked mixed.
In addition, the organic material emission spectrum is characterized by its half-wave width is wide, so the white OLED spectrum is not a large gap, which makes the OLED light source color rendering index is very excellent, especially suitable for indoor general lighting, and even professional photography And other applications. Moreover, by adjusting the light emission ratio of each color material, it is possible to produce light of arbitrary color to suit different applications.
As the OLED has a very large luminous area, the heat generated when the work can be distributed in time, no heat sink. So OLED can be very thin, saving space costs. In addition, OLED can be designed into a variety of shapes, greatly expanding the OLED lighting in the field of art decoration application space.
OLED killer level of transparent features, and even to achieve the traditional lamps can not imagine the application of the way, such as the OLED made in the window glass, during the day so that natural light transmission in the evening as a lighting fixture.
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