After effects creates graphics using the full RGB spectrum of values. This can cause problems when they are brought into nonlinear editing systems. Some systems such as those made by Avid as you if you used RGB values when you import, this will properly compensate for the difference between RGB and YUV color spaces. Most systems however will not make this fix, so you can save render time on the Nonlinear Editing side by getting your color right in AE.
Create a new adjustment layer at the top of your layer stack by choosing Layer > New > Adjustment Layer.
Apply the Broadcast Safe Effect (Effect > Video > Broadcast Safe).
Specify your format of choice (NTSC or PAL) in the Broadcast Locale menu.
Adjust the Maximum Signal sliders to set the IRE level at which pixels above will be altered . The range is between 100 to 120 IRE. A level of 100 can cause noticeable color shift while a level of 120 is often considered risky. The default value of 110 IRE units is usually the best choice.