God no!!!
Linkin Park is far from Emo, they just have such passion and maybe draw to the line of despair in some of their tracks. But you see, that's what i like about them--they speak the truth and kind of make you feel stronger within with their music. The instuments come in perfect time with the rapper and the singer. It's just very organized and shouldn't be claimed as 'Emo', just because they don't always have their lyrics being Happy.

For example, if you want Emo then listen to a track from Chemical Romance.