Similarly, U.S. Pat. No. 5,543,237 issued to Masao Watanabe on Aug. 6, 1996, the entire contents of which are herein incorporated by reference, generally discloses a light source for a flat panel display that includes a light emitting layer that is made up of an alkaline earth metal such as calcium, magnesium or barium doped with a rare earth element through a vapor deposition process.