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Open AccessArticle

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

1
Key Laboratory of Hydraulic Machinery Transients (Wuhan University), Ministry of Education, Wuhan 430072, China
2
Xiamen Changelight Co. Ltd., Xiamen 361000, China
3
The Institute of Technological Sciences, Wuhan University, Wuhan 430072, China
4
Center for Photonics and Semiconductors, School of Power and Mechanical Engineering, Wuhan University, Wuhan 430072, China
5
State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(3), 319; https://doi.org/10.3390/nano9030319
Received: 22 January 2019 / Revised: 24 February 2019 / Accepted: 26 February 2019 / Published: 28 February 2019
(This article belongs to the Special Issue Optoelectronic Nanodevices)
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. View Full-Text
Keywords: flip-chip mini-LED; prism-structured sidewall; waveguide photons; light extraction flip-chip mini-LED; prism-structured sidewall; waveguide photons; light extraction
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MDPI and ACS Style

Tang, B.; Miao, J.; Liu, Y.; Wan, H.; Li, N.; Zhou, S.; Gui, C. Enhanced Light Extraction of Flip-Chip Mini-LEDs with Prism-Structured Sidewall. Nanomaterials 2019, 9, 319.

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