Organic single-layer electroluminescent devices fabricated on CuOx-coated indium tin oxide substrate

Organic single-layer devices were fabricated by depositing tris(8-quinolinato)aluminum (ALQ) layer on ${\mathrm{CuO}}_x$ -coated indium tin oxide (ITO) substrates. These organic single-layer devices showed luminance as high as $\text{2500\hspace{0.17em}}\mathrm{cd}/{\mathrm{m}}^2,$ and the luminance-current efficiency reached 1.2 cd/A, which was higher than that of single-layer devices fabricated on conventional ITO substrates by eight times. The improvement in the electroluminescent properties of these devices was attributed to the enhanced hole injection from the ${\mathrm{CuO}}_x$ -coated ITO into the ALQ layer.