Efficient red electroluminescence from devices having multilayers of a europium complex

Hu, Wenping; Wenping Hu; Matsumura, Michio; Wang, Mingzhao; Mingzhao Wang; Jin, Linpei; Linpei Jin
December 2000
Applied Physics Letters;12/25/2000, Vol. 77 Issue 26
Academic Journal
In order to get red electroluminescence from a europium (Eu) complex with high efficiency, a hole-injection layer was inserted between the Eu-complex layer and an indium-tin-oxide electrode, and a hole-blocking layer was inserted between the Eu-complex and electron-transporting layers. To further improve the efficiency, devices having multiple-stacked Eu-complex (2.5 nm)/hole blocking (2.5 nm) units were fabricated. By stacking six units, the maximal luminance and emission efficiency of the red emission were increased to more than twice that from a device with a single Eu-complex layer. © 2000 American Institute of Physics.


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