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  • Received: Jan. 22, 2020

    Accepted: Mar. 5, 2020

    Posted: Mar. 5, 2020

    Published Online: Apr. 15, 2020

    The Author Email: Tingzhu Wu (, Hao-Chung Kuo (

    DOI: 10.1364/PRJ.388958

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    Sung-Wen Huang Chen, Yu-Ming Huang, Konthoujam James Singh, Yu-Chien Hsu, Fang-Jyun Liou, Jie Song, Joowon Choi, Po-Tsung Lee, Chien-Chung Lin, Zhong Chen, Jung Han, Tingzhu Wu, Hao-Chung Kuo. Full-color micro-LED display with high color stability using semipolar (20-21) InGaN LEDs and quantum-dot photoresist[J]. Photonics Research, 2020, 8(5): 05000630

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Photonics Research, Vol. 8, Issue 5, 05000630 (2020)

Full-color micro-LED display with high color stability using semipolar (20-21) InGaN LEDs and quantum-dot photoresist

Sung-Wen Huang Chen1, Yu-Ming Huang1,2, Konthoujam James Singh1, Yu-Chien Hsu1, Fang-Jyun Liou1, Jie Song3, Joowon Choi3, Po-Tsung Lee1, Chien-Chung Lin2, Zhong Chen4, Jung Han5, Tingzhu Wu4,6,*, and Hao-Chung Kuo1,7,*

Author Affiliations

  • 1Department of Photonics & Graduate Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, Taiwan Chiao Tung University, Hsinchu 30010, China
  • 2Institute of Photonic System, Taiwan Chiao Tung University, Tainan 71150, China
  • 3Saphlux Inc., Branford, Connecticut 06405, USA
  • 4Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, Xiamen University, Xiamen 361005, China
  • 5Department of Electrical Engineering, Yale University, New Haven, Connecticut 06520, USA
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Red-green-blue (RGB) full-color micro light-emitting diodes (μ-LEDs) fabricated from semipolar (20-21) wafers, with a quantum-dot photoresist color-conversion layer, were demonstrated. The semipolar (20-21) InGaN/GaN μ-LEDs were fabricated on large (4 in.) patterned sapphire substrates by orientation-controlled epitaxy. The semipolar μ-LEDs showed a 3.2 nm peak wavelength shift and a 14.7% efficiency droop under 200 A/cm2 injected current density, indicating significant amelioration of the quantum-confined Stark effect. Because of the semipolar μ-LEDs’ emission-wavelength stability, the RGB pixel showed little color shift with current density and achieved a wide color gamut (114.4% NTSC space and 85.4% Rec. 2020).

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