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Organic Light-Emitting diodes (OLEDs) are extremely sensitive to water vapour and oxygen, which causes rapid degradation. Epoxy and cover glass with large amount of desiccant are commonly applied to encapsulate bottom emitting OLEDs which is not a viable option for flexible as well as top emitting OLEDs. This paper reports a completely organic encapsulating layer consisting of four periods of alternate stacks of two organic materials with different morphologies deposited by simple vacuum thermal evaporation technique. Standard green OLED structures with and without encapsulation were fabricated and investigated using structural, optical and electrical studies. Moreover, the encapsulation presented being organic is safe for underlying organic layers in OLEDs and is ultrathin, transparent and without any cover glass and desiccant, ensuring its application in flexible and top emitting OLEDs

In this work, we report clear evidence of a strong substrate effect on the thickness of a spin-coated polymer film in the ultrathin (<30nm) regime. We observed a film thickness to spin speed relationship that clearly cannot be described by the classic power-law model. This “anomalous” film thickness phenomenon is quite different from those previously reported in the literature. We propose a new “non-Newtonian” bottom layer model to explain the phenomenon.

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