| US 7,498,730 B2 | ||
| Light emitting device with photonic crystal | ||
| Gianfranco Innocenti, Rivalta (Italy); Piero Perlo, Sommariva Bosco (Italy); Piermario Repetto, Turin (Italy); Denis Bollea, Fiano (Italy); Davide Capello, Turin (Italy); and Stefano Bernard, Orbassano (Italy) | ||
| Assigned to C.R.F. Societa Consortile per Azioni, Orbassano (Turin) (Italy) | ||
| Filed on Jan. 13, 2005, as Appl. No. 11/35,125. | ||
| Claims priority of application No. TO2004A0018 (IT), filed on Jan. 16, 2004. | ||
| Prior Publication US 2005/0168147 A1, Aug. 04, 2005 | ||
| Int. Cl. H01K 1/14 (2006.01); H01K 9/00 (2006.01); H01K 1/18 (2006.01) | ||
| U.S. Cl. 313—315 [313/316; 313/273] | 24 Claims |
| 1. 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.
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