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Date: 2018-08-09
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The difference between LED and OLED lighting, as well as the market conditions of OLED lighting

日期: 2018-08-09
浏览次数: 3

led


The full name is a light-emitting diode, which is generally fabricated using a Group III-IV inorganic semiconductor material and a chemical vapor deposition (CVD) process. Like the traditional semiconductor industry, its process cost is high and it is difficult to achieve large size.


Therefore, LEDs can only be applied in the form of point sources. In the field of indoor general illumination, in order to achieve a certain space of illumination brightness, LEDs need high brightness, so in order to prevent glare and produce soft light, LEDs often have to be equipped with lampshades. However, as a result, the luminous efficiency of LED lamps will also decrease.


If you want to use LEDs to create a surface light source, such as a backlight for an LCD, you need to combine multiple LEDs with a complex optical system such as a light guide. In addition, the luminous efficiency of LEDs drops sharply with increasing temperature.


Since the LED is very small in size, it is difficult to dissipate heat generated during operation, so it is necessary to equip the LED lamp with a heat sink. Based on the above reasons, the advantages of LED light source technology, such as luminous efficiency, lightness and cost, and cost advantages, will be greatly discounted after being fabricated into lamps.


At present, white LEDs are generally implemented by using a blue LED to cover phosphor powder. The phosphor powder is excited by the blue light emitted by the LED to generate yellow light, and then mixed with the blue light of the LED itself to emit white light. Although this method is low in cost, it has many disadvantages.

OLED


The full name is an organic light-emitting device. As its name suggests, OLED is a device based on organic semiconductor materials. OLED lighting is an emerging solid-state lighting technology. Its biggest feature is its non-Glaring feature, which can illuminate in the dark for a long time without letting the eyes feel tired. The materials used in OLEDs are small molecules and macromolecules. At present, industrialization mainly uses small molecular organic materials.


Since small molecule OLEDs are manufactured using a lower cost glass as a substrate and a large-area vacuum thermal evaporation film forming process, OLED is an innate surface light source technology. The OLED process technology does not require the ultra-high vacuum and high temperature environment of the LED process technology, and the cost competitiveness is much higher.


Organic materials are theoretically much lower than inorganic semiconductor materials, but are currently limited to factors such as industrial scale and material utilization in production, and the cost of organic materials is still high. However, as the scale of the industry expands, the cost of organic materials will drop significantly.


OLEDs generally emit light evenly and softly, close to the lamber radiation distribution, so the OLED itself is almost a luminaire and does not need to be used with a lampshade. At present, white light OLEDs are mainly formed by superimposing and mixing organic materials of three basic colors of red, green (yellow) and blue.


In addition, the luminescence spectrum of organic materials is characterized by a wide half-peak width, so there is no large gap in the spectrum of white OLEDs, which makes the color rendering index of OLED light source very excellent, especially suitable for indoor general illumination, even professional photography. And other applications. Moreover, by adjusting the ratio of the illuminance of each color material, light of any hue can be produced to suit different applications.


Since the OLED has a very large light-emitting area, the heat generated during operation can be dissipated in time without a heat sink. So OLED can be very thin and light, saving space costs. In addition, OLED can be designed into a variety of shapes, greatly expanding the application space of OLED lamps in the field of art decoration.


The OLED killer's transparent nature can even be achieved by traditional luminaires, such as OLEDs made on window glass, allowing natural light to pass in during the day and as a lighting fixture at night.


The thin, flexible nature of OLED lighting makes it possible to design applications that are more flexible and versatile, and that can use less material. In addition, OLED lighting does not emit heat and UV-free properties, making it ideal for outdoor lighting. Artificial sources of ultraviolet light may cause damage to human skin and may also attract insects. However, OLED light sources do not have ultraviolet light, so people can be prevented from being harassed by mosquitoes when used outdoors.


On the one hand, the white color rendering index produced by this method will be unsatisfactory, that is, the color of the object under such white light illumination may be deviated, making it unsuitable for applications where the color quality is high; on the other hand, the phosphor powder It burns much faster than blue LEDs, causing the white light to drift toward the blue, which shortens the life.


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