But the cost equation is changing quickly as technology improves and manufacturing capacity is brought online. General Electric ( NYS: GE ) is one of the companies making a big bet on LED technology as the lighting of the future. But my bet is Cree ( NAS: CREE ), a pure play in LED lighting. The company has a history of growing revenue, 18% in the most recent quarter, and will play a strong role in the technology's wider adoption. Cree's margins have fallen recently, causing its stock to flounder as well, but I think that as costs improve and volumes pick up, this company will be a long-term winner. Foolish bottom line OLEDs, advanced batteries for electric vehicles, and LED lighting are technologies I think will be long-term winners, deserving a spot in your portfolio. I'm also backing up these picks with a CAPSCall, giving Cree, Tesla, and Universal Display an outperform rating on my CAPS page.