| abstract |
A color tunable light-emitting device comprising a first light-emitting element, a passive light transformative element, an active light transformative element (e.g. an electrochromic element) disposed between the first light-emitting element and the passive light transformative element; and at least one light transmissive element. Active light transformative elements which may be employed are illustrated by electrochromic elements, photochromic elements, and thermochromic elements. |