3. Reliability

The most common definition of lifetime is the time T _1/2 after which the initial luminance L ₀ (arbitrarily chosen equal to 100 cd/m ² ) is halved, at constant operating voltage. It has been shown empirically that this lifetime is related to L ₀ 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...