The present invention relates inter alia to functional materials for the treatment and/or prophylaxis and/or diagnosis of diseases and/or cosmetic conditions. The functional materials can be used for the preparation of light emitting devices comprising fibers as light emitting elements.

Disclosed is a fiber-type organic light-emitting display panel including multiple element fibers extending in a first direction; and multiple wire fibers extending in a second direction, the multiple wire fibers being woven with the multiple element fibers, wherein each element fiber includes a core fiber, a light-emitting element and a driving element mounted on the core fiber, a first contact pad disposed in an area adjacent to the light-emitting element so as to electrically connect a first electrode layer of the light-emitting element and a first wire fiber, a second contact pad disposed in an area adjacent to the driving element so as to electrically connect a first electrode of the driving element and a second wire fiber, and a third contact pad disposed in an area adjacent to the driving element so as to electrically connect a second electrode of the driving element and a third wire fiber.

Disclosed herein is a composition and a method for energy harvesting and the autonomous detection of structural failure. This method can be used to monitor, for example, the structural integrity of unmanned aircraft systems.