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Yu B, Lu Z, Liang G, Yuan Y, Wang H, He J, Yang S. Luminous efficacy enhancement for LED lamps using highly reflective quantum dot-based photoluminescent films. OPTICS EXPRESS 2021; 29:29007-29020. [PMID: 34615019 DOI: 10.1364/oe.431345] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 08/09/2021] [Indexed: 06/13/2023]
Abstract
In this study, a strongly reflective and photoluminescent (PL) poly(lactic-co-glycolic acid) quantum dot (QD) hybrid nanofiber (PQHN) structure is introduced to enhance the luminous efficacy of QD-phosphor hybrid white light-emitting diodes (QD-WLEDs). As the thickness of PQHN film increases, the PL is found to continuously increase, exhibiting a maximum peak intensity at 120 μm, which is 1.92 times that at 12 μm, and showing the highest diffuse reflectance of 94.4% at 640 nm. Consequently, while using the QD-WLEDs, the PQHN structure achieves a 53.8% improvement in luminous flux compared with the traditional structure under a similar correlated color temperature (CCT) of 3,540 K, achieving a high luminous efficacy of 202.11 lm W-1 for QD-WLEDs. In addition, the maximum deviation of the CCT is only 11 K when the current is changed from 50 to 950 mA, demonstrating good stability. Therefore, the PQHN films have great potential in lighting systems as a hybrid functional film including light conversion and reflectance.
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Huang YM, Singh KJ, Liu AC, Lin CC, Chen Z, Wang K, Lin Y, Liu Z, Wu T, Kuo HC. Advances in Quantum-Dot-Based Displays. NANOMATERIALS 2020; 10:nano10071327. [PMID: 32640754 PMCID: PMC7407652 DOI: 10.3390/nano10071327] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/03/2020] [Accepted: 07/03/2020] [Indexed: 11/16/2022]
Abstract
In terms of their use in displays, quantum dots (QDs) exhibit several advantages, including high illumination efficiency and color rendering, low-cost, and capacity for mass production. Furthermore, they are environmentally friendly. Excellent luminescence and charge transport properties of QDs led to their application in QD-based light-emitting diodes (LEDs), which have attracted considerable attention in display and solid-state lighting applications. In this review, we discuss the applications of QDs which are used on color conversion filter that exhibit high efficiency in white LEDs, full-color micro-LED devices, and liquid-type structure devices, among others. Furthermore, we discuss different QD printing processes and coating methods to achieve the full-color micro-LED. With the rise in popularity of wearable and see-through red, green, and blue (RGB) full-color displays, the flexible substrate is considered as a good potential candidate. The anisotropic conductive film method provides a small controllable linewidth of electrically conductive particles. Finally, we discuss the advanced application for flexible full-color and highly efficient QD micro-LEDs. The general conclusion of this study also involves the demand for a more straightforward QD deposition technique, whose breakthrough is expected.
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Affiliation(s)
- Yu-Ming Huang
- Department of Photonics & Graduate Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan; (Y.-M.H.); (K.J.S.); (A.-C.L.); (H.-C.K.)
- Institute of Photonic System, National Chiao Tung University, Tainan 71150, Taiwan
| | - Konthoujam James Singh
- Department of Photonics & Graduate Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan; (Y.-M.H.); (K.J.S.); (A.-C.L.); (H.-C.K.)
| | - An-Chen Liu
- Department of Photonics & Graduate Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan; (Y.-M.H.); (K.J.S.); (A.-C.L.); (H.-C.K.)
| | - Chien-Chung Lin
- Institute of Photonic System, National Chiao Tung University, Tainan 71150, Taiwan
- Correspondence: (C.-C.L.); (T.W.); Tel.: +886-6303-2121-57754 (C.-C.L.)
| | - Zhong Chen
- Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, Xiamen University, Xiamen 361005, China; (Z.C.); (Y.L.)
| | - Kai Wang
- Department of Electrical and Electronic Engineering, Southern University of Science and Technology, 1088 Xueyuan Blvd, Xili, Nanshan, Shenzhen 518055, China; (K.W.); (Z.L.)
| | - Yue Lin
- Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, Xiamen University, Xiamen 361005, China; (Z.C.); (Y.L.)
| | - Zhaojun Liu
- Department of Electrical and Electronic Engineering, Southern University of Science and Technology, 1088 Xueyuan Blvd, Xili, Nanshan, Shenzhen 518055, China; (K.W.); (Z.L.)
| | - Tingzhu Wu
- Department of Electronic Science, Fujian Engineering Research Center for Solid-State Lighting, Xiamen University, Xiamen 361005, China; (Z.C.); (Y.L.)
- Correspondence: (C.-C.L.); (T.W.); Tel.: +886-6303-2121-57754 (C.-C.L.)
| | - Hao-Chung Kuo
- Department of Photonics & Graduate Institute of Electro-Optical Engineering, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan; (Y.-M.H.); (K.J.S.); (A.-C.L.); (H.-C.K.)
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