Brazil finished the World Cup in fourth place after a 3-0 loss in their playoff against Louis van Gaal's side, with Robin van Persie scoring from the spot before Daley Blind and Georginio Wijnaldum added two more.
|WORLD CUP SOCIAL HUB
|Keep up with all the latest news from Brazil and get involved in the debate on Twitter with our new World Cup Social Hub|
"After a heavy defeat, I think we were emotionally drained," the 27-year-old told SporTV.
"Everyone was very sad for seeing a dream going away. We went on the pitch today trying to win, but we knew it wasn’t the same thing. We lost another World Cup match.
"But now is time to raise our heads because we can’t stop, or give up. We'll have more opportunities to represent the Selecao."
Brazil went into the tournament seeking a sixth World Cup title, a dream ended by the huge defeat to Germany, and Luiz remains at a loss to explain what had happened.
"If we think of the passion the Brazilians have for football, of course we can't be happy," the Paris Saint-Gemain player added.
"We've learnt to be used to winning, to playing well. We wish we had win our sixth title.
"That Germany match was inexplicable. We suffered a blackout that left everyone sad and distraught. We couldn't react from it.
"It's hard to lose 5-0 in the first half and that kind of thing makes it difficult for you to face a third-place match. Of course we wanted to win as well, at least to give something to the fans, who were amazing. It didn't happen."