Scalable led with improved current spreading structures

Details Scalable led with improved current spreading structures Scalable led with improved current spreading structures

H - Electricity

01

L

H01L 33/38 (2010.01) H01L 33/20 (2010.01)

Patent

CA 2393009

An LED with improved current spreading structures that provide enhanced current injection into the LED's active layer (14), improving its power and luminous flux. The current spreading structures can be used in LEDs larger than conventional LEDs while maintaining the enhanced current injection. The invention is particularly applicable to LEDs having insulating substrates (12) but can also reduce the series resistance of LEDs having conductive substrates. The improved structures comprise conductive fingers (20a, 20b, 22) that form cooperating conductive paths that ensure that current spreads from the contacts (19, 21), into the fingers (20a, 20b, 22) and uniformly spreads through the oppositely doped layers (15, 16). The current then spreads to the active layer (14) to uniformly inject electrons and holes throughout the active layer (14), which recombine to emit light.

L'invention concerne une DEL dotée de structures d'étalement du courant perfectionnées, qui fournissent une injection de courant accrue dans la couche active (14) de la DEL, améliorant ainsi sa puissance et son flux lumineux. Lesdites structures d'étalement du courant peuvent être utilisées dans des DEL plus grandes que les DEL traditionnelles, tout en maintenant l'injection de courant accrue. La présente invention s'applique particulièrement aux DEL dotées de substrats isolants (12), mais elle peut également réduire les résistances en série des DEL ayant des substrats conducteurs. Lesdites structures perfectionnées sont constituées de branches conductrices (20a, 20b, 22) formant des chemins conducteurs coopérants, qui assurent l'étalement du courant à partir des contacts (19, 21) jusque dans les branches (20a, 20b, 22) et l'uniformité de l'étalement à travers les couches dopées à l'opposé (15, 16). Le courant s'étale alors vers la couche active (14) pour injecter uniformément à travers cette couche active (14) des électrons et des trous, qui se reconstituent pour émettre de la lumière.

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