| http://www.w3.org/ns/prov#value | - a multi-layer stack of materials including a light-generating region and a first layer supported by the light-generating region; and a support, wherein: the light-generating region is between the first layer and the supports; a surface of the first layer is configured so that light generated by the light-generating region can emerge from the light-emitting device via the surface of the first layer
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