Organic electroluminescent device

Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device

Reexamination Certificate

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C313S506000

Reexamination Certificate

active

06888317

ABSTRACT:
The invention provides a tool to select reliable organic LED devices, where the risk for failure before the end of its lifetime is low. This tool comprises the steps of:i) subjecting the device to a high electric field over the electroluminescent layer. This leads to a division of the devices into two, clearly separated, populations, namely one population with a low leakage current (current through the electroluminescent layer in reverse voltage operation) and one population with a high leakage current. In this step, the first population is selected in accordance with a current criterion.ii) detecting instabilities in the leakage current, referred to as noise. It has been established that these instabilities arise in particular at reverse driving voltages between 1 and 10 Volts. These instabilities are a measure of the occurrence of early failures during operation. In this step, the devices are selected in accordance with a noise criterion.

REFERENCES:
patent: 4895734 (1990-01-01), Yoshida et al.
patent: 5504323 (1996-04-01), Heeger et al.
patent: 5552678 (1996-09-01), Tang et al.
patent: 5828181 (1998-10-01), Okuda
patent: 5929561 (1999-07-01), Kawami et al.
patent: 5965901 (1999-10-01), Heeks et al.
patent: 6720091 (2004-04-01), Ohnishi et al.

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