Patent ID: 7498730

Claim:
A light-emitting device comprising a substantially filiform light source capable of being activated via passage of electric current for the purposes of emission of electromagnetic waves, wherein: at least one filiform source extends through a host element longitudinally extended; and wherein at least part of the host element includes a nano-structure configured to increase emission, from the host element, of electromagnetic waves having wavelengths in a range of 380 to 780 nm and to prevent spontaneous emission and propagation, from the host element, of infrared radiation, the nano-structure comprising a periodic series of cavities having nanometric dimensions and each filiform source extending through a plurality of the cavities of the periodic series; and wherein said part of the host element is structured in the form of a photonic crystal configured to obtain a photonic band gap that prevents said spontaneous emission and propagation of infrared radiation and increases said emission of electromagnetic waves having wavelengths in said range of 380 to 780 nm.