Naturally formed graded junction for organic light-emitting diodes

Yan Shao; Yang Yang
September 2003
Applied Physics Letters;9/22/2003, Vol. 83 Issue 12, p2453
Academic Journal
In this letter, we report naturally-formed graded junctions (NFGJ) for organic light-emitting diodes (OLEDs). These junctions are fabricated using single thermal evaporation boat loaded with uniformly mixed charge transport and light-emitting materials. Upon heating, materials sublimate sequentially according to their vaporizing temperatures forming the graded junction. Two kinds of graded structures, sharp and shallow graded junctions, can be formed based on the thermal properties of the selected materials. The NFGJ OLEDs have shown excellent performance in both brightness and lifetime compared with heterojunction devices. © 2003 American Institute of Physics.


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