Reliability
Display. Visualization — OLED displays

The most common definition of lifetime is the time T_1/2 after which the initial luminance L₀ (arbitrarily chosen equal to 100 cd/m²) is halved, at constant operating voltage. It has been shown empirically that this lifetime is related to L₀ and therefore to the initial current density :

Although the lifetime of organic electroluminescent devices is still a key issue for the industrialization of displays, considerable progress has been made (from a few minutes to several thousand hours, depending on the material). This progress has been made possible by a better understanding of degradation mechanisms.

Given the extreme thinness of organic thin films (< 100 nm), the main cause of malfunction is short-circuiting. It is therefore...