Patent ID: 6614175
Filing Date: 2003-09-02
Classification: H01L

Abstract:
An organic light emitting device comprising in an optional sequence(i) a substrate; (ii) a first electrode; (iii) a mixed region comprising a mixture of a hole transport material and an electron transport material, and wherein this mixed region includes at least one organic luminescent material; (iv) a second electrode; (v) a thermal protective element coated on the second electrode, wherein one of the two said first and second electrodes is a hole injection anode, and one of the two said electrodes is an electron injection cathode, and wherein the organic light emitting device further comprises; (vi) a hole transport region, interposed between the anode and the mixed region, wherein the hole transport region optionally includes a buffer layer; and (vii) an electron transport region interposed between the second electrode and the mixed region.