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OLED device structure, improved

As was pointed out earlier, blue is often the weakest link in the white OLED structure and needs improvement both in efficiency and stability. A novel architecture has been developed to obtain a stable blue color by using a similar format to the high-stability white devices. To this end, it was found that a stable blue emission could be obtained by using a "white" structure if the blue emission is decoupled from the yellow emission by the introduction of a thin, nonemitting buffer layer between these two layers. This nonemitting buffer layer consists of a HTM (such as NPB) and an ETM (such as EK-BH121). Figure 14.15 shows the stabilized blue device structure. The... [Pg.453]

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See also in sourсe #XX -- [ Pg.6 ]



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