An Improved GaN-Based Light-Emitting Diode with a SiO2 Current Blocking Layer Embedded in Stair-Like AZO Transparent Structure. (1st January 2017)

• Record Type: Journal Article
• Authors: Liou, Syuan-Hao; Tsai, Jung-Hui; Liu, Wen-Chau; Lin, Pao-Sheng; Chen, Yu-Chi
• Is Part Of: ECS journal of solid state science and technology. Volume 6:Number 10(2017)
• Page Start: R149
• Page End: R153
• Publication Date: 2017-01-01
• Subjects: current blocking -- GaN -- light-emitting diode; Solid state chemistry -- Periodicals; Electronics -- Materials -- Periodicals; Electrochemistry -- Periodicals; 541.0421
• DOI: 10.1149/2.0231709jss
• Languages: English
• ISSNs: 2162-8777

Abstract

Abstract : In this article, in order to enhance the optical characteristics, GaN-based light-emitting diodes (LEDs) with SiO2 current blocking layer and stair-like aluminum-doped zinc oxide (AZO) transparent layers are fabricated and demonstrated. The characteristics of the LEDs with a planner AZO transparent layer, a SiO2 current blocking layer embedded in planner AZO transparent layer and a stair-like AZO transparent structure, and a SiO2 current blocking layer embedded in stair-like AZO transparent structure are comparatively studied. Experimental results exhibit that the current crowding effect can be effectively improved and it shows the best optical characteristics for the use of a SiO2 current blocking layer embedded in the stair-like transparent structure. At current level of 20 mA, it exhibits the improvements by 17.37%, 37.9%, and 26.3% in light output power, external extraction efficiency, and wall-plug efficiency, as compared to the conventional device with a planner transparent layer.