Ameliorating Uniformity and Color Conversion Efficiency in Quantum Dot-Based Micro-LED Displays through Blue–UV Hybrid Structures

Tzu-Yi Lee; Wen-Chien Miao; Yu-Ying Hung; Yi-Hong Bai; Pei-Tien Chen; Wei-Ta Huang; Kuan-An Chen; Chien-Chung Lin; Fang-Chung Chen; Yu-Heng Hong; Hao-Chung Kuo

doi:10.3390/nano13142099

Nanomaterials (Jul 2023)

Ameliorating Uniformity and Color Conversion Efficiency in Quantum Dot-Based Micro-LED Displays through Blue–UV Hybrid Structures

Tzu-Yi Lee,
Wen-Chien Miao,
Yu-Ying Hung,
Yi-Hong Bai,
Pei-Tien Chen,
Wei-Ta Huang,
Kuan-An Chen,
Chien-Chung Lin,
Fang-Chung Chen,
Yu-Heng Hong,
Hao-Chung Kuo

Affiliations

Tzu-Yi Lee: Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Wen-Chien Miao: Semiconductor Research Center, Hon Hai Research Institute, Taipei 11492, Taiwan
Yu-Ying Hung: Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Yi-Hong Bai: Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Pei-Tien Chen: Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Wei-Ta Huang: Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Kuan-An Chen: SynthEdge Advanced Materials Corp. Ltd., Taoyuan 32742, Taiwan
Chien-Chung Lin: Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 10617, Taiwan
Fang-Chung Chen: Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Yu-Heng Hong: Semiconductor Research Center, Hon Hai Research Institute, Taipei 11492, Taiwan
Hao-Chung Kuo: Department of Photonics, College of Electrical and Computer Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan

DOI: https://doi.org/10.3390/nano13142099
Journal volume & issue: Vol. 13, no. 14
p. 2099

Abstract

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Quantum dot (QD)-based RGB micro light-emitting diode (μ-LED) technology shows immense potential for achieving full-color displays. In this study, we propose a novel structural design that combines blue and quantum well (QW)-intermixing ultraviolet (UV)-hybrid μ-LEDs to achieve high color-conversion efficiency (CCE). For the first time, the impact of various combinations of QD and TiO2 concentrations, as well as thickness variations on photoluminescence efficiency (PLQY), has been systematically examined through simulation. High-efficiency color-conversion layer (CCL) have been successfully fabricated as a result of these simulations, leading to significant savings in time and material costs. By incorporating scattering particles of TiO2 in the CCL, we successfully scatter light and disperse QDs, effectively reducing self-aggregation and greatly improving illumination uniformity. Additionally, this design significantly enhances light absorption within the QD films. To enhance device reliability, we introduce a passivation protection layer using low-temperature atomic layer deposition (ALD) technology on the CCL surface. Moreover, we achieve impressive CCE values of 96.25% and 92.91% for the red and green CCLs, respectively, by integrating a modified distributed Bragg reflector (DBR) to suppress light leakage. Our hybrid structure design, in combination with an optical simulation system, not only facilitates rapid acquisition of optimal parameters for highly uniform and efficient color conversion in μ-LED displays but also expands the color gamut to achieve 128.2% in the National Television Standards Committee (NTSC) space and 95.8% in the Rec. 2020 standard. In essence, this research outlines a promising avenue towards the development of bespoke, high-performance μ-LED displays.

Published in Nanomaterials

ISSN: 2079-4991 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Science: Chemistry
Website: https://www.mdpi.com/journal/nanomaterials

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