Adjusting White OLEDs with Yellow Light Emission Phosphor Dye and Ultrathin NPB Layer Structure

<table>The luminance-voltage characteristics of four organic devices External power efficiency of device B was setting in the right bar of figure at different forward biases.</table>

International Journal of Photoenergy

fig4

Figure 4

Figure 4: Adjusting White OLEDs with Yellow Light Emission Phosphor Dye and Ultrathin NPB Layer Structure 