Surface textured LEDs and method for making the same

US7977702B2 · kind B2 · utility

Assignee

• Avago Technologies ECBU IP (Singapore) Pte. Ltd. · SG

Inventors

• Michael R. T. Tan · Palo Alto, US
• Michael Leary · Mountain View, US

Key dates

• Filing date: Nov 2, 2006
• Grant date: Jul 12, 2011
• Expiry date: Nov 2, 2026

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/882

Abstract

A light-emitting device that includes an LED and a light extraction layer and the method for making the same are disclosed. The LED includes a substrate on which an active layer is sandwiched between a p-type layer and an n-type layer, the active layer generating light in a band of wavelengths about a central wavelength when holes and electrons recombine therein. The n-type layer, active layer, and p-type layer are formed on the substrate. First and second electrodes for providing a potential difference between the p-type layer and the n-type layer are included in the LED. The light extraction layer includes a clear layer of material having a first surface in contact with a surface of the LED and a second surface having light scattering features with dimensions greater than 0.5 times the central wavelength. The material of the clear layer can be polycrystalline or amorphous.