Heterogeneous Integration of Microscale GaN Light‐Emitting Diodes and Their Electrical, Optical, and Thermal Characteristics on Flexible Substrates. Issue 1 (22nd November 2017)

• Record Type: Journal Article
• Authors: Li, Lizhu; Liu, Changbo; Su, Yuanzhe; Bai, Junchun; Wu, Jianqiu; Han, Yanjun; Hou, Yubin; Qi, Shuxian; Zhao, Yu; Ding, He; Yan, Yifei; Yin, Lan; Wang, Pu; Luo, Yi; Sheng, Xing
• Is Part Of: Advanced materials technologies. Volume 3:Issue 1(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-11-22
• Subjects: flexible devices -- indium gallium nitride -- laser liftoff -- microscale LEDs -- transfer printing; Materials science -- Periodicals; Technological innovations -- Periodicals; Materials science; Technological innovations; Periodicals; 620.1105
• DOI: 10.1002/admt.201700239
• Languages: English
• ISSNs: 2365-709X

Abstract

Abstract: Materials and device strategies to form inorganic, thin‐film, microscale light‐emitting diodes (micro‐LEDs) are presented based on a simplified release method. High performance gallium nitride based blue micro‐LEDs are fabricated on and released from both patterned sapphire substrates (PSSs) and conventional nonpatterned sapphire substrates (CSSs). Micro‐LEDs are transferred onto copper and polyimide based flexible substrates and their electrical and optical performances are maintained. Thermal properties of PSS and CSS based micro‐LEDs are systematically explored on different substrates. Finally, micro‐LEDs combined with phosphor coatings demonstrate capability for polychromatic emission. The techniques presented here provide promising paths to advanced light sources with potential applications in lighting, displays, and biomedicine. Abstract : Thin‐film, microscale gallium nitride light‐emitting diodes are released from both patterned and nonpatterned sapphire, and transferred onto copper and polyimide‐based flexible substrates, using a simplified lift‐off approach. Their electrical, optical, and thermal performances on heterogeneous substrates are investigated, and polychromatic emission is demonstrated by integrating with phosphors.