69





 12

 ad-half
 1 --ad-full


 s08


 06





 02
 *^06- ------- ------------------------




 400 450 500 550 6 0

 -02
 Wavelength (nm)



Fig 4.11 Visible blue emission spectrum of as-deposited ZnS:TmF3 half-stack vs. full-
 stack devices.