Improvement of Power Efficiency in Phosphorescent  White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer

<table>(a) Current density-voltage (<svg height="13.6375" id="M29" style="vertical-align:-1.97925pt" version="1.1" viewbox="0 0 7.8874998 13.6375" width="7.8874998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.113)"><use xlink:href="#x1D43D"></use></g>
</svg>-<svg height="11.375" id="M30" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 12.7375 11.375" width="12.7375" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.112)"><use xlink:href="#x1D449"></use></g>
</svg>) and (b) luminance-voltage (<svg height="11.175" id="M31" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 9.8249998 11.175" width="9.8249998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.113)"><path d="M559 163q-23 -66 -68 -163h-474l6 26q62 4 79.5 19.5t28.5 75.5l78 409q7 35 8.5 49t-8 25t-24 13t-51.5 5l5 28h266l-6 -28q-65 -5 -79.5 -18t-25.5 -74l-76 -406q-10 -57 14 -75q12 -13 96 -13q93 0 126 29q41 40 76 109z" id="x1D43F"></path></g>
</svg>-<svg height="11.375" id="M32" style="vertical-align:-0.1638pt" version="1.1" viewbox="0 0 12.7375 11.375" width="12.7375" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.112)"><use xlink:href="#x1D449"></use></g>
</svg>) characteristics of WOLEDs with different MoO<sub>3</sub> doping concentrations. Inset in (b): luminance-current density (<svg height="11.175" id="M33" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 9.8249998 11.175" width="9.8249998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.113)"><use xlink:href="#x1D43F"></use></g>
</svg>-<svg height="13.6375" id="M34" style="vertical-align:-1.97925pt" version="1.1" viewbox="0 0 7.8874998 13.6375" width="7.8874998" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,11.113)"><use xlink:href="#x1D43D"></use></g>
</svg>) characteristics from the same devices.</table>

International Journal of Photoenergy

fig4

Figure 4

Figure 4: Improvement of Power Efficiency in Phosphorescent  White Organic Light-Emitting Diodes Using p-Doped Hole Transport Layer 