OLED aimed lighting field protagonist (three): production prices will fall to about 4 yen /lm

Figure 82015 "brightness of the unit price" will reach the level of popularity through OLED lighting, fluorescent lamps, incandescent lamps, etc., according to the average unit brightness of the light source sales costs were compared. The service life of the light source and the cost of the installation equipment are not considered. Some view that, although the cost of OLED lighting is very high at the beginning, but with the advance of mass production will rapidly decline, by 2015 will reach the standard value as a universal 1 yen /lm". It was even predicted that by 2020 the cost of OLED lighting will be flat with incandescent.

Production prices will fall to about 4 yen /lm

Finally, the cost problem. Since the OLED lighting has not yet begun mass production, therefore, it can not be compared with the existing lighting technology.

Lumiotec's goal is to achieve the "2009 sample delivery, the luminous efficiency of 25lm/W, 15cm square panel at 50 thousand yen in April 2012, production began, the luminous efficiency of the 40lm/W panel is 5000 yen (" the company's heavy permanent level). If converted into a unit brightness cost, then the production began at about 4 yen /lm, just the same as the current white LED costs (Figure 8). In addition, some predict that by 2015 will reach 1 yen /lm, which is considered to be the standard level of general lighting technology popularization.

As for the actual cost, it is necessary to take into account the cost of lighting equipment outside the light source, as well as the life of the light source is closely related to the number of replacement. Because of the thin and light characteristics of OLED lighting, it is possible to simplify the lighting apparatus. In addition, because the direction of the light can be concentrated in one direction at the component level, the reflecting plate is not needed for the fluorescent lamp. Some even believe that, given the light source is likely to become very long life, the total cost of production will be significantly lower than the existing fluorescent lamps, etc..

Simple measures to increase the popularity of brightness

Trying to get used to the lighting brightness and the service life of today, the focus of technology development is competition from manufacturers of materials development and device performance alone, gradually turning to the practical goal than previously envisaged more comprehensive aspects. Specifically include the following: according to the use to ensure that the brightness and service life; improve the color rendering of light; in order to reduce the cost and greatly improve production and improve material utilization efficiency; lighting appliances into one after the light output efficiency is increased; the area sufficient to ensure quality. Below, some of these techniques are introduced.

At present, most manufacturers are envisaged in the OLED lighting brightness for the premise of 1000cd/m2 development. However, the brightness is only about 2 times the average brightness of the TV, not enough to illuminate the whole room. Therefore, the original idea as a floor lamp and other auxiliary lighting purposes (Matsushita Electric) manufacturers quite a lot. The reason is that, although I hope to increase the brightness, but if into the high current, improve the brightness, then the service life will be shortened, luminous efficiency will be reduced.

However, this problem can be alleviated. For example, the city of Yamagata University and others in 2002 released the "MPE (Multi-photon Emission)", which is a way to avoid the brightness and service life and luminous efficiency between the existence of the relationship between the 4 methods. In particular, the method is based on the structure of a light emitting element having a light emitting function under the electrode holder, and the number of stacks of such cells (Figure 9). Although this is just a simple equivalent of a solar cell in a tandem cell or a sandwich in a food, the benefits of this approach are great. If the stack of 2 layers, even if the increase in power, so that the brightness to 2 times, the current flow in each layer is also certain, the service life will not be shortened. Because the current can be reduced to 1/2, the utility model can greatly improve the service life and luminous efficiency. However, the problem with this approach is that the resistance increases with the number of stacks.

Figure 9. The overview and effect of MPE technology developed by the Yamagata University's urban households in 2002 by "multi level" while improving brightness, service life and color rendering. MPE is a technique for stacking basic light-emitting elements through the middle layer (a). As a result, the service life of the utility model is more than 10 thousand hours (b) under the brightness of up to 5000cd/m2. If the power is increased by increasing the number of components on the basis of increasing the number of stacked elements, the brightness and the luminous efficiency (c) can be improved accordingly. On the other hand, if the power to maintain a certain, although the brightness will not increase, but due to the current in each component of the current is reduced, thus prolonging the service life. Freedom of choice of components.

Part of the project funded by the city of Lumiotec from the beginning of the use of the technology, put into operation to achieve the brightness of the fluorescent lamp is equivalent to 5000cd/m2, the service life of 10 thousand hours or more OLED lighting note 11).

Note 11) for brightness, some views that, as long as the increase in area, you can ensure a certain amount of luminous flux. Up to 5000cd/m2 brightness is not necessary "(Konica Minolta). However, the city of Yamagata University pointed out that the cost of OLED lighting depends on the area. When the luminous flux at the same time, brightness as high as possible OLED lighting can reduce the area, reduce costs".

There are indications that Matsushita Electric has begun to use a combination of light-emitting units to ensure that the color of the note 12). For example, Novaled, Kodak, Germany Fraunhofer IPMS and other manufacturers, but also in the near future began to introduce the use of MPE