Luminous efficiency over LED organic EL lighting off soon

Luminous efficiency more than LED

Following the luminous efficiency of 100lm/W, the realization of about 130lm/W has become the next target of the manufacturers. Because this is about 2 times the ordinary fluorescent lighting efficiency (New Energy Industry Technology Development Agency (NEDO), while its lighting efficiency and LED lighting quite.

However, 130lm/W is not the end. The luminous efficiency of organic EL lighting will be further improved, compared with the lamp efficiency, it is expected that the organic EL lighting will be the highest luminous efficiency technology in all lighting technologies. Technical personnel, American Eastman Kodak, Nanjing is now the first organic photoelectric company (First O-Lite) founder and chief technology officer Tian Yuansheng (Yuan-Sheng Tyan) pointed out that "the theoretical limit of white organic light emitting efficiency of EL is 248lm/W, similar to the 260lm/ W LED white light source". In other words, the efficiency of lighting, organic EL lighting may be the highest.

The actual luminous efficiency is also close to 200lm/W. IHS ElectronicsMedia predicts that the organic EL lighting panel 200lm/W will be available in 2019. The U.S. Department of energy (DOE) also 190lm/W as the ultimate goal of organic EL lighting technology development. Organic EL manufacturers of American Universal Display Technology (UDC), although no mention of the specific implementation time, but said, as an organic EL lighting luminous efficiency, 180lm/W is a more realistic goal".

Improve the efficiency of a breakthrough

Target is set high, but the current supply of organic EL lighting panel luminous efficiency has not yet reached. Even from a global perspective, the highest value is only LG chemical 60lm/W. Japan's domestic products, Konica Minolta holdings panel Symfos is the highest value of 45lm/W, other products are mostly only about 30lm/W.

There is a huge gap between the product and the target value of the future, because recently made a breakthrough, can improve the efficiency of luminous efficiency (Figure 5). Especially in the following 3 points made great progress: (1) to improve the efficiency of extraction from the light, the light extraction layer (2) through the inhibition of surface plasmon resonance and improve the light extraction efficiency, * (3) to improve the efficiency of blue light emitting materials.

Figure 1: the improvement of luminous efficiency made several breakthroughs

There are many factors to improve the luminous efficiency, which is the focus of (1) to improve the light extraction efficiency; (2) reduce the surface plasmon loss and optical waveguide mode; (3) improve the internal quantum efficiency of blue light emitting materials, technology innovation actually is advancing.

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