| http://www.w3.org/ns/prov#value | - a plurality of light-emitting devices, at least some of the light-emitting devices comprising: 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 support; a surface of the first layer is configured so that light generated by the light-
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