ORGANIC ELECTROLUMINESCENCE CELLS BASED ON THIN-FILMS DEPOSITED BY ULTRAVIOLET-LASER ABLATION

Organic thin films of copper-phthalocyanine (CuPc) and aluminum tris-8 -hydroxyquinline (Alq(3)) were fabricated via KrF laser ablation. In s pite of poor crystallinity exhibited in the reconstructed organic film s, the CuPc film still works as a hole-transport layer in electrolumin escence cells based on the CuPc and Alq(3) layers. Electroluminescence at similar to 500 nm-was obtained with a low initiation voltage of si milar to 12 V. There is no significant difference in electroluminescen ce performance for devices fabricated via laser ablation and thermal e vaporation. Emission at similar to 600 nm caused by energy transfer fr om Alq(3) to ylene)-2-methyl-6-(p-dimethylaminostyryl)-4H-pyran (DCM) is also observed from a DCM-doped Alq(3) emission layer. (C) 1997 Amer ican Institute of Physics. [S0003-6951(97)00143-5].