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Hou CF, Tsui WA, Chou RJ, Hsu CH, Feria DN, Lin TY, Chen YF. Speckle-Free, Angle-Free, Cavity-Free White Laser with a High Color Rendering Index. ACS Appl Mater Interfaces 2024; 16:11489-11496. [PMID: 38393972 PMCID: PMC10921373 DOI: 10.1021/acsami.3c17222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 02/03/2024] [Accepted: 02/08/2024] [Indexed: 02/25/2024]
Abstract
The freedom from efficiency droop motivates monochromatic lasers to progress in general lighting applications due to the demand for more efficient and sustainable light sources. Still, a white light based on monochromatic lasers with high lighting quality, such as a high color rendering ability, an angle-independent output, and a speckle-free illumination, has not yet been fabricated nor demonstrated. Random lasers, with the special mechanism caused by multiple scattering, the angle-free emission, and the uncomplicated fabrication processes, inspire us to investigate the feasibility of utilizing them in general lighting. In this work, a white random laser with a high color rendering index (CRI) value, regardless of pumping energy and observing direction, was performed and discussed. We also investigated the stability of white RL as its CIE chromaticity coordinates exhibit negligible differences with increasing pump energy density, retaining its high-CRI measurement. Also, it exhibits angle-independent emission while having a high color rendering ability. After passing through a scattering film, it generated no speckles compared to the conventional laser. We demonstrated the advances in white laser illumination, showing that a white random laser is promising to be applied for high-brightness illumination, biological-friendly lighting, accurate color selections, and medical sensing.
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Affiliation(s)
- Cheng-Fu Hou
- Department
of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - Wei-An Tsui
- Department
of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung City 202301, Taiwan
| | - Rou-Jun Chou
- Department
of Physics, National Taiwan University, Taipei 10617, Taiwan
| | - Chih-Hao Hsu
- Department
of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung City 202301, Taiwan
| | - Denice N. Feria
- Department
of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung City 202301, Taiwan
| | - Tai-Yuan Lin
- Department
of Optoelectronics and Materials Technology, National Taiwan Ocean University, Keelung City 202301, Taiwan
| | - Yang-Fang Chen
- Department
of Physics, National Taiwan University, Taipei 10617, Taiwan
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2
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Liu Z, Chen J, Chen L, Liu H, Yang D, Ma D, Tang BZ, Zhao Z. Simultaneously Realizing High Efficiency and High Color Rendering Index for Hybrid White Organic Light-Emitting Diodes by Ultra-Thin Design of Delayed Fluorescence Sensitized Phosphorescent Layers. Small 2024; 20:e2305589. [PMID: 37828633 DOI: 10.1002/smll.202305589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 09/25/2023] [Indexed: 10/14/2023]
Abstract
In consideration of energy economization and light quality, concurrently attaining high external quantum efficiency (ηext ) and high color rendering index (CRI) is of high significance for the commercialization of hybrid white organic light-emitting diodes (WOLEDs) but is challenging. Herein, a blue luminescent molecule (2PCz-XT) consisting of a xanthone acceptor and two 3,6-diphenylcarbazole donors is prepared, which exhibits strong delayed fluorescence, short delayed fluorescence lifetime, and excellent electroluminescence property, and can sensitize green, orange, and red phosphorescent emitters efficiently. By employing 2PCz-XT as sensitizer and phosphorescent emitters as dopants, efficient two-color and three-color WOLED architectures with ultra-thin phosphorescent emitting layers (EMLs) are proposed and constructed. By incorporating a thin interlayer to modulate exciton recombination zone and reduce exciton loss, high-performance three-color hybrid WOLEDs are finally achieved, providing a high ηext of 26.8% and a high CRI value 83 simultaneously. Further configuration optimization realizes a long device operational lifetime. These WOLEDs with ultra-thin phosphorescent EMLs are among the state-of-the-art hybrid WOLEDs in the literature, demonstrating the success and applicability of the proposed device design for developing robust hybrid WOLEDs with superb efficiency and color quality.
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Affiliation(s)
- Zhangshan Liu
- State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
| | - Jinke Chen
- State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
| | - Letian Chen
- State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
| | - Hao Liu
- State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
| | - Dezhi Yang
- State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
| | - Dongge Ma
- State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
| | - Ben Zhong Tang
- School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen, Guangdong, 518172, China
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou, 510640, China
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Xu W, Han Q, Ji C, Zeng F, Zhang X, Deng J, Shi C, Peng Z. Solid-State, Hectogram-Scale Preparation of Red Carbon Dots as Phosphor for Energy-Transfer-Induced High-Quality White LEDs with CRI of 97. Small 2023; 19:e2304123. [PMID: 37649215 DOI: 10.1002/smll.202304123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/22/2023] [Indexed: 09/01/2023]
Abstract
In this study, pre-crystallization-controlled, solid-state preparation of red carbon dots (C-dots) from o-phenylenediamine on a hectogram scale with a 94% yield is reported. Highly efficient red phosphor (C-dots@MCC) is obtained by dispersing the C-dots in microcrystalline cellulose, which matched extremely well with the commercial Y3 Al5 O12 :Ce3+ (YAG) phosphor. White light-emitting diodes (WLEDs) fabricated from the two phosphors emitted warm white light with a correlated color temperature of 3845 K, CIE color coordinates of (0.38, 0.37), and an extremely high color rendering index (CRI) of 95, outperforming all the reported YAG-derived WLEDs. Furthermore, the CRI value of the WLED can be further increased to 97 after fine-tuning, which is the highest CRI for WLEDs of any C-dots derived devices reported so far. The superior performance of the WLED is attributed to a delicate energy transfer between YAG and C-dots@MCC. Most importantly, the WLED maintained excellent stabilities under varied currents, working durations, moistures, and temperatures.
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Affiliation(s)
- Wenjun Xu
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
- Electron Microscopy Center, Yunnan University, Kunming, 650091, China
| | - Qiurui Han
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Chunyu Ji
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Fanhao Zeng
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Xingshou Zhang
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Jiwen Deng
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
| | - Changsheng Shi
- Department of Physics, Key Laboratory of Yunnan Provincial Higher Education Institutions for Optoelectronics Device Engineering, Yunnan University, Kunming, 650091, China
| | - Zhili Peng
- Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming, 650091, China
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Baek E, Kim B, Kim S, Song J, Yoo J, Park SM, Lee JM, Ko JH. Color Rendering Index over 95 Achieved by Using Light Recycling Process Based on Hybrid Remote-Type Red Quantum-Dot Components Applied to Conventional LED Lighting Devices. Nanomaterials (Basel) 2023; 13:2560. [PMID: 37764589 PMCID: PMC10534905 DOI: 10.3390/nano13182560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Revised: 09/08/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023]
Abstract
Red color conversion materials have often been used in conventional white LEDs (light-emitting diodes) to enhance the insufficient deep-red component and thus improve the color-rendering property. Quantum dots (QDs) are one of the candidates for this due to their flexibility in controlling the emission wavelength, which is attributed to the quantum confinement effect. Two types of remote QD components, i.e., QD films and QD caps, were prepared and applied to conventional white LED illumination to improve the color-rendering properties. Thanks to the red component near 630 nm caused by the QD components, the color rendering indices (CRIs) of both Ra and R9 could be increased to over 95. It was found that both the diffusing nature of the reflector and the light recycling process in the vertical cavity between the bottom reflector and the top optical films play important roles in improving the color conversion efficiency of remote QD components. The present study showed that the proper application of remote QDs combined with a suitable optical cavity can control the correlated color temperature of the illumination over a wide range, thus realizing different color appearances of white LED illumination. In addition, a high CRI of over 95 could be achieved due to the sufficient excitation from fewer QDs, due to the strong optical cavity effect.
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Affiliation(s)
| | | | | | | | | | | | | | - Jae-Hyeon Ko
- Nano Convergence Technology Center, School of Semiconductor∙Display Technology, Hallym University, Chuncheon 24252, Gangwon-do, Republic of Korea (J.-M.L.)
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Swathika M, Natarajan A. Synthesis and photometric properties of efficient white-emitting phosphor of M-AMG transition metal complexes for OLED applications. LUMINESCENCE 2023; 38:1230-1243. [PMID: 35986892 DOI: 10.1002/bio.4365] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 07/30/2022] [Accepted: 08/03/2022] [Indexed: 11/09/2022]
Abstract
Progression in lighting sources mainly depended on new, robust energy-efficient diodes due to their advanced photometric properties. All organic light-emitting sources are constant energy-efficient devices and will be the light of the future. We explore the potential of transition metal complexes by focusing on cobalt(II), nickel(II), and copper (II) with aminoguanidine naphthoate as white phosphors in organic light-emitting diodes (OLEDs). The phosphors synthesized at optimized temperature were characterized structurally and thermally by spectral, thermal, and diffraction techniques. The photophysical studies of the target compound in several organic solvents having divergent polarity were also studied, and the results were exhibited. Photometric properties of the complexes were studied using photoluminescence, CIE (Commission internationale de l'éclairage) chromaticity coordinates, correlated color temperature, color purity, Duv, and TLCI (Television Lighting Consistency Index) to verify the applicability of complexes as phosphors. Excellent luminescence property with a high coloring index for (Cu(2NA-AMG-2H2 O)) opens the advanced avenue for light sources and serves as vital constituents for light-emitting diodes.
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Affiliation(s)
- Manoharan Swathika
- Department of Chemistry, PSGR Krishnammal College for Women, Coimbatore, Tamil Nadu, India
| | - Arunadevi Natarajan
- Department of Chemistry, PSGR Krishnammal College for Women, Coimbatore, Tamil Nadu, India
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Yan Z, Chen T, Yan L, Liu X, Zheng J, Ren F, Yang Y, Liu B, Liu X, Xu B. One-Step Synthesis of White-Light-Emitting Carbon Dots for White LEDs with a High Color Rendering Index of 97. Adv Sci (Weinh) 2023; 10:e2206386. [PMID: 36815394 PMCID: PMC10131834 DOI: 10.1002/advs.202206386] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 01/23/2023] [Indexed: 06/18/2023]
Abstract
White-light-emitting carbon dots (WCDs) show innate advantages as phosphors in white light-emitting diodes (WLEDs). For WLEDs, the color rendering index (CRI) is the most important metric to evaluate its performance. Herein, WCDs are prepared by a facile one-step solvothermal reaction of trimellitic acid and o-phenylenediamine. It consists of four CDs identified by column chromatography as blue, green, yellow, red, and thus white light is a superposition of these four types of light. The mixture of the four CDs undergoes Förster resonance energy transfer to induce the generation of white light. The photoluminescence of WCDs originates from the synergistic effect of carbon core and surface states. Thereinto, the carbon core states dominate in RCDs, and the increase of amide contents and degree of conjugation promote the redshift of the emission spectra, which is further confirmed by theoretical calculations. In addition, a high CRI of 97 is achieved when the WCDs are used as phosphors to fabricate WLEDs, which is almost the highest value up to now. The multicolor LEDs can also be fabricated by using the four multicolor CDs as phosphors, respectively. This work provides a novel approach to explore the rapid preparation of low-cost, high-performance WCDs and CDs-based WLEDs.
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Affiliation(s)
- Zishan Yan
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
| | - Tong Chen
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
| | - Lingpeng Yan
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
- College of Materials Science and EngineeringTaiyuan University of Technology030024TaiyuanP. R. China
| | - Xinghua Liu
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- College of Materials Science and EngineeringTaiyuan University of Technology030024TaiyuanP. R. China
| | - Jingxia Zheng
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
| | - Fu‐de Ren
- School of Chemical Engineering and TechnologyNorth University of China030051TaiyuanP. R. China
| | - Yongzhen Yang
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
| | - Bin Liu
- School of Energy and Power EngineeringNorth University of China030051TaiyuanP. R. China
- School of Chemical Engineering and TechnologyNorth University of China030051TaiyuanP. R. China
| | - Xuguang Liu
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- College of Materials Science and EngineeringTaiyuan University of Technology030024TaiyuanP. R. China
| | - Bingshe Xu
- Key Laboratory of Interface Science and Engineering in Advanced MaterialsMinistry of EducationTaiyuan University of Technology030024TaiyuanP. R. China
- Shanxi‐Zheda Institute of Advanced Materials and Chemical Engineering030032TaiyuanP. R. China
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Hong SC, Ko JH. Structural Optimization of Vertically-Stacked White LEDs with a Yellow Phosphor Plate and a Red Quantum-Dot Film. Nanomaterials (Basel) 2022; 12:2846. [PMID: 36014714 PMCID: PMC9414739 DOI: 10.3390/nano12162846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 08/17/2022] [Accepted: 08/17/2022] [Indexed: 06/15/2023]
Abstract
A remote-type white light-emitting diode (LED) consisting of a red quantum-dot (QD) film and a yellow phosphor plate was studied by both experiment and optical simulation. The sequence of the two color-conversion films had a substantial effect on the color-rendering properties of the vertically-stacked white LED, and the optimized configuration exhibited a high color rendering index of more than 90 thanks to the enhanced red component via the QD film. For the design of high-power white LED devices of a remote type, it was necessary to locate the color-conversion films below the diffuser plate to remove the substantial color dispersion depending on the viewing angle. The present study shows that high power and high color-rendering white LED devices can be realized in terms of two vertically-stacked color-conversion materials, which would provide long-term stability due to the remote design.
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Kim SW, Go Y, Kang SO, Lee CK. Quantitative visual tests in primary open-angle glaucoma patients according to three different lights with different color-rendering index. BMC Ophthalmol 2021; 21:238. [PMID: 34049514 PMCID: PMC8161653 DOI: 10.1186/s12886-021-02005-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Accepted: 05/17/2021] [Indexed: 11/10/2022] Open
Abstract
Purpose To compare quantitative visual tests, such as visual acuity, contrast sensitivity, and color vision tests in patients with primary open-angle glaucoma (POAG) patients according to three different light systems with different color-rendering index (CRI). Methods This was a cross-sectional study of 36 eyes in 36 patients with POAG. Three different light systems consisting of a 3-band fluorescent lamp (CRI 80), a white LED (CRI 75), and a quantum dot LED (CRI > 95) were used. All lights had the same illuminance of 230 lx to exclude illuminance effects. The visual testing included best-corrected visual acuity (BCVA) using an ETDRS chart, a CSV-1000E contrast test, and a color test performed by the Farnsworth Munsell 100-hue test. Results There was no significant difference in BCVA (p = 0.86). There were no significant differences in the detail contrast tests according to the three light systems (p = 0.95, p = 0.94, p = 0.94, respectively, p = 0.64). There was significant difference between the three light systems in color test (p = 0.042). The color test scores with a quantum dot LED were significantly lower than those of the white LED and 3-band fluorescent lamp (p = 0.03 and 0.047, respectively). Conclusions POAG patients did not show significant differences in visual acuity scores and contrast test scores, expressed as black and white symbols, according to the different light systems. However, POAG patients tested under a quantum dot LED (CRI > 95) could distinguish color differences better than in the other light systems.
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Affiliation(s)
- Sang Woo Kim
- Department of Ophthalmology, Ulsan University Hospital, University of Ulsan College of Medicine, 877 Bangeojinsunhwando-ro, Dong-gu, 44033, Ulsan, South Korea
| | - YoungWook Go
- GL Vision Co., Ltd, Seo-myeon, Republic of Korea
| | - Sang-Ook Kang
- Department of Advanced Materials Chemistry, Korea University, Seoul, South Korea
| | - Chang Kyu Lee
- Department of Ophthalmology, Ulsan University Hospital, University of Ulsan College of Medicine, 877 Bangeojinsunhwando-ro, Dong-gu, 44033, Ulsan, South Korea. .,Biomedical Research Center, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, South Korea.
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Yang Y, Ju Y, Li Y, Yin L, Chen L, Gu P, Zhang J. Transparent Nanostructured BiVO 4 Double Films with Blue Light Shielding Capabilities to Prevent Damage to ARPE-19 Cells. ACS Appl Mater Interfaces 2020; 12:20797-20805. [PMID: 32174100 DOI: 10.1021/acsami.9b22465] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The hazards posed by blue light to human eyes are attracting significant attention owing to increasing exposure to electronic devices as well as artificial illumination. Therefore, in this study, nanostructured BiVO4 (BVO) double films were developed using an economical and environmentally friendly sol-gel spin-coating method; the films exhibited excellent blue light shielding capabilities. They could block 65.25% of the blue light in the 415-455 nm wavelength range while simultaneously maintaining an average transmittance greater than 85% in the 500-800 nm wavelength range. Moreover, the damp heat test (85 °C, 85% relative humidity) showed the excellent stability of the BVO filters as their transmittances remained unchanged for 15 days. Importantly, cell experiments were performed to further confirm the protective effects of the BVO filters against the hazards posed by blue light to ARPE-19 cells (human retinal pigment epithelium cell line). Furthermore, the blue light weighted radiance LB decreased by 34.32%, and the color rendering index showed negligible differences after applying an upscaled BVO filter to a phone screen. These cost-efficient, ecofriendly, highly reliable, and large-area nanostructured BVO films with high blue light shielding efficiency have potential applications in various areas.
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Affiliation(s)
- Yanan Yang
- Department of Material Science and Engineering, Shanghai University, Shanghai 200072, China
- Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200072, China
| | - Yahan Ju
- Department of Ophthalmology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Yi Li
- Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200072, China
| | - Luqiao Yin
- Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200072, China
| | - Longlong Chen
- Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200072, China
| | - Ping Gu
- Department of Ophthalmology, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China
| | - Jianhua Zhang
- Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200072, China
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Zhang J, Xu G, Tao F, Zeng G, Zhang M, Yang YM, Li Y, Li Y. Highly Efficient Semitransparent Organic Solar Cells with Color Rendering Index Approaching 100. Adv Mater 2019; 31:e1807159. [PMID: 30663145 DOI: 10.1002/adma.201807159] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 12/28/2018] [Indexed: 05/15/2023]
Abstract
Neutral-colored semitransparent organic solar cells (ST-OSCs) have attracted considerable attention owing to their unique application in no-visual-obstacle building-integrated photovoltaics. Toward this promising potential application, a synergistic effect is first proposed by employing a dielectric mirror and ternary photoactive layer with near-infrared absorption to tune the color perception as well as ST-OSC performance precisely. As a result, a neutral-color ST-OSC with high average transmittance of over 21% is successfully constructed, and a remarkable color-rendering index approaching 100 and high power conversion efficiency (PCE) of 9.37% are simultaneously achieved. To the best of our knowledge, this is the highest PCE reported for neutral-color ST-OSCs to date. Importantly, this synergistic effect is demonstrated to be a universal strategy that is not only suitable for various photoactive layer systems, but can also be implanted in flexible substrate. The resulting neutral-color flexible ST-OSCs also show a promising PCE of 8.76%.
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Affiliation(s)
- Jingwen Zhang
- Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Guiying Xu
- Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Feng Tao
- State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Guang Zeng
- Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
- College of Materials Science and Engineering, Nanchang Hangkong University, 696 Fenghe Avenue, Nanchang, 330063, China
| | - Moyao Zhang
- Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Yang Michael Yang
- State Key Laboratory of Modern Optical Instrumentation College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Yaowen Li
- Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
| | - Yongfang Li
- Laboratory of Advanced Optoelectronic Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China
- Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
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11
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Shen P, Wang G, Kang B, Guo W, Shen L. High-Efficiency and High-Color-Rendering-Index Semitransparent Polymer Solar Cells Induced by Photonic Crystals and Surface Plasmon Resonance. ACS Appl Mater Interfaces 2018; 10:6513-6520. [PMID: 29380594 DOI: 10.1021/acsami.7b18765] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Semitransparent polymer solar cells (ST-PSCs) show attractive potential in power-generating windows or building-integrated photovoltaics. However, the development of ST-PSCs is lagging behind opaque PSCs because of the contradiction between device efficiency and transmission. Herein, Ag/Au alloy nanoparticles and photonic crystals (PCs) were simultaneously introduced into ST-PSCs, acting compatibly as localized surface plasmon resonances and distributed Bragg reflectors to enhance light absorption and transmission. As a result, ST-PSCs based on a hybrid PTB7-Th:PC71BM active layer contribute an efficiency as high as 7.13 ± 0.15% and an average visible transmission beyond 20%, which are superior to most of the reported results. Furthermore, PCs can partly compensate valley range of transmission by balancing reflection and transmission regions, yielding a high color rendering index of 95. We believe that the idea of two light management methods compatibly enhancing the performance of ST-PSCs can offer a promising path to develop photovoltaic applications.
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Affiliation(s)
- Ping Shen
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Guoxin Wang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Bonan Kang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Wenbin Guo
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China
| | - Liang Shen
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, People's Republic of China
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Liu B, Nie H, Lin G, Hu S, Gao D, Zou J, Xu M, Wang L, Zhao Z, Ning H, Peng J, Cao Y, Tang BZ. High-Performance Doping-Free Hybrid White OLEDs Based on Blue Aggregation-Induced Emission Luminogens. ACS Appl Mater Interfaces 2017; 9:34162-34171. [PMID: 28880519 DOI: 10.1021/acsami.7b11422] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Doping-free white organic light-emitting diodes (DF-WOLEDs) have aroused research interest because of their simple properties. However, to achieve doping-free hybrid WOLEDs (DFH-WOLEDs), avoiding aggregation-caused quenching is challenging. Herein, blue luminogens with aggregation-induced emission (AIE) characteristics, for the first time, have been demonstrated to develop DFH-WOLEDs. Unlike previous DFH-WOLEDs, both thin (<1 nm) and thick (>10 nm) AIE luminogen (AIEgen) can be used for devices, enhancing the flexibility. Two-color devices show (i) pure-white emission, (ii) high CRI (85), and (iii) high efficiency. Particularly, 19.0 lm W1- is the highest for pure-white DF-WOLEDs, while 35.0 lm W1- is the best for two-color hybrid WOLEDs with CRI ≥ 80. A three-color DFH-WOLED shows broad color-correlated temperature span (2301-11628 K), (i) the first sunlight-like OLED (2500-8000 K) operating at low voltages, (ii) the broadest span among sunlight-like OLED, and (iii) possesses comparable efficiency with the best doping counterpart. Another three-color DFH-WOLED exhibits CRI > 90 at ≥3000 cd m-2, (i) the first DF-WOLED with CRI ≥ 90 at high luminances, and (ii) the CRI (92.8) is not only the highest among AIE-based WOLEDs but also the highest among DF-WOLEDs. Such findings may unlock an alternative concept to develop DFH-WOLEDs.
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Affiliation(s)
- Baiquan Liu
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Han Nie
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Gengwei Lin
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Shiben Hu
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Dongyu Gao
- New Vision Optoelectronic Technology Co., Ltd, Guangzhou 510530, China
| | - Jianhua Zou
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Miao Xu
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Lei Wang
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Zujin Zhao
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Honglong Ning
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Junbiao Peng
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Yong Cao
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
| | - Ben Zhong Tang
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, The Hong Kong University of Science & Technology , Clear Water Bay, Kowloon, Hong Kong 999077, China
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Dillip GR, Munirathnam K, Raju BDP, Sushma NJ, Joo SW. An efficient orange-red-emitting LiNa 3 P 2 O 7 :Sm 3+ pyrophosphate: Structural and optical analysis for solid-state lighting. LUMINESCENCE 2016; 32:772-778. [PMID: 27860121 DOI: 10.1002/bio.3249] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 09/17/2016] [Accepted: 10/08/2016] [Indexed: 11/09/2022]
Abstract
A trivalent rare-earth ion (Sm3+ )-doped LiNa3 P2 O7 (LNPO) phosphor was synthesized using a conventional high-temperature solid-state reaction route. A predominant orthorhombic phase of LNPO was observed in all X-ray diffraction patterns. The surface states of the LNPO:Sm phosphor were confirmed by X-ray photoelectron spectroscopy. Under 401 nm excitation, the Sm-doped LNPO phosphors showed sharp emission peaks at 563, 600 and 647 nm that are related to the f-f transition of Sm3+ ions. The optimum concentration of Sm3+ (9 mol%) produced Commission Internationale de l'Eclairage chromaticity coordinates, color rendering index and correlated color temperature of (0.564, 0.434), 42 and 1843 K, respectively.
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Affiliation(s)
- G R Dillip
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, South Korea
| | - K Munirathnam
- Department of Physics, Sri Venkateswara University, Tirupati, India.,School of Physical Sciences, Reva University, Bangalore, India
| | - B Deva Prasad Raju
- Department of Future Studies, Sri Venkateswara University, Tirupati, India
| | - N John Sushma
- Department of Biotechnology, Sri Padmavathi Women's University, Tirupati, India
| | - S W Joo
- School of Mechanical Engineering, Yeungnam University, Gyeongsan, South Korea
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Chuang PH, Lin CC, Liu RS. Emission-tunable CuInS2/ZnS quantum dots: structure, optical properties, and application in white light-emitting diodes with high color rendering index. ACS Appl Mater Interfaces 2014; 6:15379-87. [PMID: 25111960 DOI: 10.1021/am503889z] [Citation(s) in RCA: 92] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Synthesis and application of CuInS2/ZnS core/shell quantum dots (QDs) with varying [Cu]/[In] ratios were conducted using a stepwise solvothermal route. CuInS2 (CIS) core QDs with varying [Cu]/[In] ratios exhibited deep-red emissions result from donor-acceptor pair recombination. The absorption and emission band gap of the CuInS2 QDs increased with the decrease in Cu content. The emission bands of the CuInS2/ZnS were tuned from 550 to 616 nm by controlling the [Cu]/[In] ratio after coating ZnS layer. The CIS QDs model was developed to elucidate the synthesized crystal structure and photoluminescence of the QDs with various [Cu]/[In] ratios. Temperature-dependent photoluminescence spectra of the CIS/ZnS QDs were also investigated. The temperature dependency of the photoluminescence energy and intensity for various CIS/ZnS QDs were studied from 25 to 200 °C. Efficient white light-emitting diodes with high color rendering index values (Ra = 90) were fabricated using CIS/ZnS QDs as color converters in combination with green light-emitting Ba2SiO4:Eu(2+) phosphors and blue light-emitting diodes.
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Affiliation(s)
- Po-Hsiang Chuang
- Department of Chemistry, National Taiwan University , Taipei 106, Taiwan
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Sadaf JR, Israr MQ, Nur O, Willander M, Ding Y, Wang ZL. The correlation between radiative surface defect states and high color rendering index from ZnO nanotubes. Nanoscale Res Lett 2011; 6:513. [PMID: 21878100 PMCID: PMC3212052 DOI: 10.1186/1556-276x-6-513] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2011] [Accepted: 08/30/2011] [Indexed: 05/31/2023]
Abstract
Combined surface, structural and opto-electrical investigations are drawn from the chemically fashioned ZnO nanotubes and its heterostructure with p-GaN film. A strong correlation has been found between the formation of radiative surface defect states in the nanotubes and the pure cool white light possessing averaged eight color rendering index value of 96 with appropriate color temperature. Highly important deep-red color index value has been realized > 95 which has the capability to render and reproduce natural and vivid colors accurately. Diverse types of deep defect states and their relative contribution to the corresponding wavelengths in the broad emission band is suggested.
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Affiliation(s)
- Jamil R Sadaf
- Department of Science and Technology, Campus Norrköping, Linköping University, SE-601 74 Norrköping, Sweden
| | - Muhammad Q Israr
- Department of Science and Technology, Campus Norrköping, Linköping University, SE-601 74 Norrköping, Sweden
| | - Omer Nur
- Department of Science and Technology, Campus Norrköping, Linköping University, SE-601 74 Norrköping, Sweden
| | - Magnus Willander
- Department of Science and Technology, Campus Norrköping, Linköping University, SE-601 74 Norrköping, Sweden
| | - Yong Ding
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245 USA
| | - Zhong L Wang
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245 USA
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