| abstract |
An organic light emitting device containing(i) an anode or a first electrode;(ii) a hole transport layer containing, for example, a mixture of a porphyrin and a hole transport material(iii) a mixed region containing a mixture of (1) a hole transport material, and (2) an electron transport material;(iv) a cathode or second electrode, and wherein the organic light emitting device may further contain at least one of(v) an electron transport region interposed between the mixed region and the cathode; and(vi) a thermal protective element coated on one of the anode and cathode. |