1
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Nanda GP, Sk B, Yadav N, Rajamanickam S, Deori U, Mahashaya R, Zysman-Colman E, Rajamalli P. Ultrathin non-doped thermally activated delayed fluorescence emitting layer for highly efficient OLEDs. Chem Commun (Camb) 2021; 57:13728-13731. [PMID: 34870289 DOI: 10.1039/d1cc04972k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report highly efficient, ultrathin non-doped green and bluish-green organic light-emitting diodes (OLEDs) using a thermally activated delayed fluorescence (TADF) emitter. The green OLED with an ultrathin (∼1 nm) EML showed a 2.6-fold higher external quantum efficiency (EQEmax) of 13.5% with a luminance of 17 250 cd m-2 than the conventional (30 nm) non-doped device.
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Affiliation(s)
- Gyana Prakash Nanda
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Bahadur Sk
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Nisha Yadav
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Suresh Rajamanickam
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Upasana Deori
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Rahul Mahashaya
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
| | - Eli Zysman-Colman
- Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St Andrews, UK.
| | - Pachaiyappan Rajamalli
- Materials Research Centre, Indian Institute of Science, Bangalore-560012, Karnataka, India.
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2
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Recent progress in phosphorescent Ir(III) complexes for nondoped organic light-emitting diodes. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213283] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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3
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Li Y, Xu Z, Zhu X, Chen B, Wang Z, Xiao B, Lam JWY, Zhao Z, Ma D, Tang BZ. Creation of Efficient Blue Aggregation-Induced Emission Luminogens for High-Performance Nondoped Blue OLEDs and Hybrid White OLEDs. ACS APPLIED MATERIALS & INTERFACES 2019; 11:17592-17601. [PMID: 31012298 DOI: 10.1021/acsami.9b03177] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Organic blue luminescent materials are essential for organic light-emitting diodes (OLEDs). However, high-quality blue materials that can fulfill the requirements of OLED commercialization are much rare. Herein, two novel blue luminogens, 9-(4-(2,6-di- tert-butyl-10-(4-(1,2,2-triphenylvinyl)phenyl)anthracen-9-yl)phenyl)-9 H-carbazole and 9-(4-(2,6-di- tert-butyl-10-(4-(1,2,2-triphenylvinyl)phenyl)anthracen-9-yl)1,3-di(9 H-carbazol-9-yl)benzene (TPE-TADC), consisting of anthracene, tetraphenylethene, and carbazole groups are successfully prepared, and their thermal, optical, electronic, and electrochemical properties are fully investigated. They exhibit prominent aggregation-induced emission property and strong blue fluorescence at ∼455 nm in neat films. Efficient nondoped OLEDs are fabricated with these blue luminogens, providing blue electroluminescence (EL) at 451 nm (CIE x, y = 0.165, 0.141) and high EL efficiencies of 6.81 cd A-1, 6.57 lm W-1, and 5.71%. By utilizing TPE-TADC as a blue emissive layer, high-performance two-color hybrid white OLEDs are achieved, furnishing modulatable light color from pure white (CIE x, y = 0.33, 0.33) to warm white (CIE x, y = 0.44, 0.46) and excellent EL efficiencies of 56.7 cd A-1, 55.2 lm W-1, and 19.2%. More importantly, these blue and white OLEDs all display ultrahigh color and efficiency stabilities at high luminance, indicating the great potential of these blue luminogens for the application in OLED displays and white illumination.
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Affiliation(s)
- Yinghao Li
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China
| | - Zeng Xu
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China
| | - Xiangyu Zhu
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China
| | - Bin Chen
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China
| | - Zhiming Wang
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China
| | - Biao Xiao
- Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, School of Chemical and Environmental Engineering , Jianghan University , Wuhan 430056 , China
| | - Jacky W Y Lam
- Department of Chemistry, Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction , The Hong Kong University of Science and Technology , Clear Water Bay , Kowloon , Hong Kong 999077 , China
| | - Zujin Zhao
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China
| | - Dongge Ma
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , South China University of Technology , Guangzhou 510640 , China
| | - Ben Zhong Tang
- State Key Laboratory of Luminescent Materials and Devices, Center for Aggregation-Induced Emission , 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 and Technology , Clear Water Bay , Kowloon , Hong Kong 999077 , China
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Xiao P, Huang J, Yu Y, Liu B. Recent Developments in Tandem White Organic Light-Emitting Diodes. Molecules 2019; 24:E151. [PMID: 30609748 PMCID: PMC6337303 DOI: 10.3390/molecules24010151] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 12/24/2018] [Accepted: 12/25/2018] [Indexed: 12/20/2022] Open
Abstract
Tandem white organic light-emitting diodes (WOLEDs) are promising for the lighting and displays field since their current efficiency, external quantum efficiency and lifetime can be strikingly enhanced compared with single-unit devices. In this invited review, we have firstly described fundamental concepts of tandem device architectures and their use in WOLEDs. Then, we have summarized the state-of-the-art strategies to achieve high-performance tandem WOLEDs in recent years. Specifically, we have highlighted the developments in the four types of tandem WOLEDs (i.e., tandem fluorescent WOLEDs, tandem phosphorescent WOLEDs, tandem thermally activated delayed fluorescent WOLEDs, and tandem hybrid WOLEDs). Furthermore, we have introduced doping-free tandem WOLEDs. In the end, we have given an outlook for the future development of tandem WOLEDs.
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Affiliation(s)
- Peng Xiao
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China.
| | - Junhua Huang
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China.
| | - Yicong Yu
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China.
| | - Baiquan Liu
- LUMINOUS! Centre of Excellent for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore.
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.
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5
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Luo D, Xiao P, Liu B. Doping-Free White Organic Light-Emitting Diodes. CHEM REC 2018; 19:1596-1610. [PMID: 30548958 DOI: 10.1002/tcr.201800147] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/28/2018] [Indexed: 11/11/2022]
Abstract
Doping-free white organic light-emitting diodes (WOLEDs) have great potential to the next-generation solid-state lighting and displays due to the excellent properties, such as high efficiency, bright luminance, low power consumption, simplified structure and low cost. In this account, our recent developments on doping-free WOLEDs have been summarized. Firstly, fundamental concepts of doping-free WOLEDs have been described. Then, the effective strategies to develop doping-free WOLEDs have been presented. Particularly, the manipulation of charges and excitons distribution in different kinds of doping-free WOLEDs have been highlighted, including doping-free fluorescent/phosphorescent hybrid WOLEDs, doping-free thermally activated delayed fluorescent WOLEDs and doping-free phosphorescent WOLEDs. In the end, an outlook for the future development of doping-free WOLEDs have been clarified.
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Affiliation(s)
- Dongxiang Luo
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006, China
| | - Peng Xiao
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan, 528000, China
| | - Baiquan Liu
- LUMINOUS!, Centre of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, 639798, Singapore.,Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640, China
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6
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Recent Advances of Exciplex-Based White Organic Light-Emitting Diodes. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8091449] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Recently, exciplexes have been actively investigated in white organic light-emitting diodes (WOLEDs), since they can be effectively functioned as (i) fluorescent or thermally activated delayed fluorescent (TADF) emitters; (ii) the hosts of fluorescent, phosphorescent and TADF dopants. By virtue of the unique advantages of exciplexes, high-performance exciplex-based WOLEDs can be achieved. In this invited review, we have firstly described fundamental concepts of exciplexes and their use in organic light-emitting diodes (OLEDs). Then, we have concluded the primary strategies to develop exciplex-based WOLEDs. Specifically, we have emphasized the representative WOLEDs using exciplex emitters or hosts. In the end, we have given an outlook for the future development of exciplex-based WOLEDs.
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7
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Yu H, Dai X, Yao F, Wei X, Cao J, Jhun C. Efficient white phosphorescent organic light-emitting diodes using ultrathin emissive layers (<1 nm). Sci Rep 2018; 8:6068. [PMID: 29666419 PMCID: PMC5904154 DOI: 10.1038/s41598-018-24434-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 03/27/2018] [Indexed: 12/01/2022] Open
Abstract
In this paper, efficient phosphorescent white organic light-emitting diodes (WOLEDs) were fabricated based on ultrathin doping-free emissive layers and mixed bipolar interlayers. The energy transfer processes were proved via the research of WOLEDs with different interlayer thicknesses and transient photoluminescence lifetime. WOLEDs with optimized thickness of doping-free emissive layers show maximum current efficiency of 47.8 cd/A and 44.9 cd/A for three-colors and four-colors WOLEDs, respectively. The Commission Internationale de L’Eclairage coordinates shows a very slight variation of ( ± 0.02, ± 0.02) from 5793 cd/m2 to 11370 cd/m2 for three-colors WOLEDs and from 3038 cd/m2 to 13720 cd/m2 for four-colors WOLEDs, respectively. The stability of the spectra is attributed to the stable and sequential energy transfer among the various dyes. The color temperature of four-colors WOLEDs can be obtained from 2659 to 6636 by adjusting the thickness of ultrathin emissive layer.
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Affiliation(s)
- Haojian Yu
- School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China
| | - Xudong Dai
- School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China
| | - Fangnan Yao
- School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China
| | - Xiang Wei
- School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China
| | - Jin Cao
- Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, 200072, China.
| | - Chulgyu Jhun
- School of Green Energy & Semiconductor Eng., Hoseo University, Asan City, Chungnam, 336-795, South Korea
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8
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Zhang L, Li XL, Luo D, Xiao P, Xiao W, Song Y, Ang Q, Liu B. Strategies to Achieve High-Performance White Organic Light-Emitting Diodes. MATERIALS (BASEL, SWITZERLAND) 2017; 10:E1378. [PMID: 29194426 PMCID: PMC5744313 DOI: 10.3390/ma10121378] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 11/25/2017] [Accepted: 11/27/2017] [Indexed: 01/09/2023]
Abstract
As one of the most promising technologies for next-generation lighting and displays, white organic light-emitting diodes (WOLEDs) have received enormous worldwide interest due to their outstanding properties, including high efficiency, bright luminance, wide viewing angle, fast switching, lower power consumption, ultralight and ultrathin characteristics, and flexibility. In this invited review, the main parameters which are used to characterize the performance of WOLEDs are introduced. Subsequently, the state-of-the-art strategies to achieve high-performance WOLEDs in recent years are summarized. Specifically, the manipulation of charges and excitons distribution in the four types of WOLEDs (fluorescent WOLEDs, phosphorescent WOLEDs, thermally activated delayed fluorescent WOLEDs, and fluorescent/phosphorescent hybrid WOLEDs) are comprehensively highlighted. Moreover, doping-free WOLEDs are described. Finally, issues and ways to further enhance the performance of WOLEDs are briefly clarified.
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Affiliation(s)
| | - Xiang-Long Li
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.
| | - Dongxiang Luo
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
| | - Peng Xiao
- School of Physics and Optoelectronic Engineering, Foshan University, Foshan 528000, China.
| | | | | | - Qinshu Ang
- Shunde Polytechnic, Foshan 528300, China.
| | - 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.
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798, Singapore.
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9
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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 APPLIED MATERIALS & 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] [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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Liu B, Wang L, Tao H, Xu M, Zou J, Ning H, Peng J, Cao Y. Doping-free tandem white organic light-emitting diodes. Sci Bull (Beijing) 2017; 62:1193-1200. [PMID: 36659513 DOI: 10.1016/j.scib.2017.08.021] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 08/05/2017] [Accepted: 08/09/2017] [Indexed: 01/21/2023]
Abstract
Tandem white organic light-emitting diodes (WOLEDs) are of great research interest since they can greatly boost the performance compared with the single-unit counterparts. However, their structures are more complicated than those of single-unit OLEDs. Besides, to achieve high performance, the doping technology is required to tandem OLEDs, particularly for tandem WOLEDs, further complicating the structures. Herein, doping-free tandem WOLEDs, for the first time, have been demonstrated. By managing an effective doping-free charge generation layer to interconnect doping-free emitting layers/charge transport layers, high-performance doping-free tandem WOLEDs have been developed. The blue-yellow device accomplishes the simplified structure/short fabrication time/reduced cost/high efficiency/low efficiency roll-off/low voltage/high luminance trade-off, which cannot be achieved by previous tandem WOLEDs. Remarkably, the efficiency (81.2cdA-1) is ∼2-fold higher than the highest efficiency of previous doping-free WOLEDs and even higher than those of some best doping tandem WOLEDs. The maximum luminance is 44,886cdm-2, which is the highest for doping-free WOLEDs. Besides, the blue-red device can exhibit a color rendering index (CRI) of 67, which is even higher than that of some representative three-color tandem WOLEDs. Such findings may not only represent a significant step for doping-free WOLEDs, but unlock a novel avenue that doping-free tandem WOLEDs are promising to achieve the simplicity and high performance trade-off.
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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
| | - 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
| | - Hong Tao
- 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
| | - 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.
| | - 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
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Luo D, Yang Y, Xiao Y, Zhao Y, Yang Y, Liu B. Regulating Charge and Exciton Distribution in High-Performance Hybrid White Organic Light-Emitting Diodes with n-Type Interlayer Switch. NANO-MICRO LETTERS 2017; 9:37. [PMID: 30393732 PMCID: PMC6199033 DOI: 10.1007/s40820-017-0138-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Accepted: 01/26/2017] [Indexed: 06/08/2023]
Abstract
The interlayer (IL) plays a vital role in hybrid white organic light-emitting diodes (WOLEDs); however, only a negligible amount of attention has been given to n-type ILs. Herein, the n-type IL, for the first time, has been demonstrated to achieve a high efficiency, high color rendering index (CRI), and low voltage trade-off. The device exhibits a maximum total efficiency of 41.5 lm W-1, the highest among hybrid WOLEDs with n-type ILs. In addition, high CRIs (80-88) at practical luminances (≥1000 cd m-2) have been obtained, satisfying the demand for indoor lighting. Remarkably, a CRI of 88 is the highest among hybrid WOLEDs. Moreover, the device exhibits low voltages, with a turn-on voltage of only 2.5 V (>1 cd m-2), which is the lowest among hybrid WOLEDs. The intrinsic working mechanism of the device has also been explored; in particular, the role of n-type ILs in regulating the distribution of charges and excitons has been unveiled. The findings demonstrate that the introduction of n-type ILs is effective in developing high-performance hybrid WOLEDs.
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Affiliation(s)
- Dongxiang Luo
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 People’s Republic of China
| | - Yanfeng Yang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 People’s Republic of China
| | - Ye Xiao
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 People’s Republic of China
| | - Yu Zhao
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 People’s Republic of China
| | - Yibin Yang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou, 510006 People’s Republic of China
| | - Baiquan Liu
- Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou, 510640 People’s Republic of China
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore, 639798 Singapore
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12
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Jing YM, Zhao Y, Zheng YX. Photoluminescence and electroluminescence of iridium(iii) complexes with 2′,6′-bis(trifluoromethyl)-2,4′-bipyridine and 1,3,4-oxadiazole/1,3,4-thiadiazole derivative ligands. Dalton Trans 2017; 46:845-853. [DOI: 10.1039/c6dt03919g] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Highly efficient OLEDs based on green and orange iridium(iii) complexes based on 2′,6′-bis(trifluoromethyl)-2,4′-bipyridine and 2-(5-(4-(trifluoromethyl)phenyl)-1,3,4-oxadiazol-2-yl)phenol show peak current efficiencies of 74.8 and 41.0 cd A−1, respectively, with low efficiency roll-off.
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Affiliation(s)
- Yi-Ming Jing
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - Yue Zhao
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
| | - You-Xuan Zheng
- State Key Laboratory of Coordination Chemistry
- Collaborative Innovation Center of Advanced Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210093
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13
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Kushida S, Okabe S, Dao TD, Ishii S, Nagao T, Saeki A, Kijima M, Yamamoto Y. Self-assembled polycarbazole microspheres as single-component, white-colour resonant photoemitters. RSC Adv 2016. [DOI: 10.1039/c6ra10662e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Self-assembled polycarbazole microspheres exhibit white-colour whispering gallery mode photoluminescence from the whole visible spectral range.
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Affiliation(s)
- Soh Kushida
- Division of Materials Science
- Faculty of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Shinnosuke Okabe
- Division of Materials Science
- Faculty of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Thang D. Dao
- Photonics Nano-Engineering Group
- National Institute for Materials Science (NIMS)
- Tsukuba
- 305-0044 Japan
- CREST
| | - Satoshi Ishii
- Photonics Nano-Engineering Group
- National Institute for Materials Science (NIMS)
- Tsukuba
- 305-0044 Japan
- CREST
| | - Tadaaki Nagao
- Photonics Nano-Engineering Group
- National Institute for Materials Science (NIMS)
- Tsukuba
- 305-0044 Japan
- CREST
| | - Akinori Saeki
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Suita
- Japan
| | - Masashi Kijima
- Division of Materials Science
- Faculty of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Yohei Yamamoto
- Division of Materials Science
- Faculty of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
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14
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Efficient and low-voltage phosphorescent organic light-emitting devices based on blue iridium complex host. Chem Res Chin Univ 2015. [DOI: 10.1007/s40242-015-5243-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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