Researchers from the University of Toronto developed the world's most efficient OLED on plastic, which they say is comparable with the best glass-based OLEDs. They discovered that coating the plastic substrate with a 50-100 nano-meter thick layer of tantalum(V) oxide (Ta2O5), an advanced optical thin-film coating material enabled them to re-construct the high-refractive index property previously limited to heavy metal-doped glass:

The researchers say that to create a high-efficiency OLED you need a high-refractive-index (n <= 1.8) substrate (to enhance the outcoupling of trapped light in the device). Plastic substrates have a low refractive index (n <= 1.6). The researchers say that their method allows for a high-efficiency OLED that does not depend on a high-index substrate. They used a phosphorescent OLED, a high-index Ta2O5 optical coupling layer, electrically conductive gold layer and hole-injection MoO3 layer. All these components are collectively optimized to achieve high efficiency. The maximum external quantum efficiency reaches 63% for green, which remains as high as 60% at >10,000 cd/m–2.

Source: Nature

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How can the headline be drived from that Interview

There is no information following the headline either in the text below (no references) or in the video interview, which gives more details on that specific device.

Further the interview is drastically misleading, as Mr. Helander is mostly working with vacuum processes, at least he is mostly publishing on vacuum-based devices. Prof. Prof. Zheng-Hong Lu's website at the University of Toronto. So where do the printing processes he is talking about come into play? An why plastic substrates: Because it does not break, when you drop you cell phone. And same in the production process. Is it cheaper to be produced. Not at the moment, if you are Samsung and your LCD production is running on glass substrates. 

 

The whole interview is 3:42 of blabla.

error

sorry, it is 3:28 of blabla