Effects of the morphologies and structures of light-emitting layers on the performance of organic electroluminescent devices

Qin, D. S.; Li, D. C.; Wang, Y.; Zhang, J. D.; Xie, Z. Y.; Wang, G.; Wang, L. X.; Yan, D. H.
January 2001
Applied Physics Letters;1/22/2001, Vol. 78 Issue 4, p437
Academic Journal
Organic electroluminescent devices with a structure of ITO/ploy (9-vinylcarbazole)/tris (8-hydroxyquinoline) aluminum (Alq3)/Mg:Ag are fabricated at different substrate temperatures (77, 298, and 438 K) during Alq3 deposition. It is found that the surface morphologies of Alq3 thin films greatly affect the I-V characteristics of the devices by the contact area between metal cathode and light-emitting layer. There is an increase in the luminous efficiency of the devices in the order 77 K<298 K<438 K. We attribute this trend to different structures of Alq3 thin films.


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