Enhanced Light Extraction of Flip-Chip Mini-LEDs with Prism-Structured Sidewall

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ID: 78437
2019
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Abstract
Current solutions for improving the light extraction efficiency of flip-chip light-emitting diodes (LEDs) mainly focus on relieving the total internal reflection at sapphire/air interface, but such methods hardly affect the epilayer mode photons. We demonstrated that the prism-structured sidewall based on tetramethylammonium hydroxide (TMAH) etching is a cost-effective solution for promoting light extraction efficiency of flip-chip mini-LEDs. The anisotropic TMAH etching created hierarchical prism structure on sidewall of mini-LEDs for coupling out photons into air without deteriorating the electrical property. Prism-structured sidewall effectively improved light output power of mini-LEDs by 10.3%, owing to the scattering out of waveguided light trapped in the gallium nitride (GaN) epilayer.
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Authors Tang, Bin;Miao, Jia;Liu, Yingce;Wan, Hui;Li, Ning;Zhou, Shengjun;Gui, Chengqun;
Journal Nanomaterials
Year 2019
DOI
DOI not found
URL
https://www.mdpi.com/2079-4991/9/3/319
Keywords
chemistry Biology (General) Medicine Materials of engineering and construction. Mechanics of materials Engineering (General). Civil engineering (General) Biotechnology Technology physics fuel

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