Towards high-power-efficiency solution-processed OLEDs: Material and device perspectives

Wang, Shumeng; Zhang, Hongyang; Zhang, Baohua; Xie, Zhiyuan; Wong, Wai Yeung

doi:10.1016/j.mser.2020.100547

Cited by 216 publications

(155 citation statements)

References 440 publications

(972 reference statements)

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“…Many works have been done to the design and preparation of noble metal-based PTMCs toward highly efficient OLEDs. [77][78][79][80][81][82] So far, many commercialized emitters are based on these phosphors (such as iridium(III) complex). [83][84][85][86][87][88] However, these noble metals often have some disadvantages (such as high cost and low abundance in nature).…”

Section: Organic Light-emitting Diodesmentioning

confidence: 99%

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Tao

Liu

Wong

2020

Advanced Optical Materials

100

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light-emitting device (OLED) in 1998, [1] phosphorescent transition-metal complexes, especially for noble metal-based ones (e.g., iridium(III), platinum(II), etc.) as triplet emitters toward highly efficient organic electroluminescence, have aroused extensive attention. [15-21] Owing to strong spin-orbit coupling effect, these complexes may use both singlet and triplet excitons to greatly enhance the efficiency of OLED, breaking the upper limit of the conventional fluorescent device efficiency. Due to their unique properties of excited states, they also have extended their applications in other fields, for instance, catalysis, organic solar cells, organic memory devices, biological sensing and imaging, photodynamic therapy, information recording, and security protection, etc. [22-27] Although extensive works have been done to the design and preparation of phosphorescent materials based on noble metals, these noble metals usually have some disadvantages (such as high cost and low abundance in nature), thereby limiting their practical applications. The relatively abundant and cheap PTMCs of low toxicity have drawn considerable interests very recently. [4,23,24,28-31] Many kinds of non-noble metal-based PTMCs such as copper(I), tungsten(VI), and manganese(II) complexes have emerged rapidly. [4,23-25,28-31] Phosphorescent manganese(II) complexes show great potentials in many applications, due to their features including highly efficient phosphorescence, flexible design in molecular structure, ease of synthesis, and rich physical properties (e.g., triboluminescence, stimuli-responsivity, etc.). [24,25a,32-36] Compared with the noble metals, manganese element with an atomic number of 25 has abundant reserves, is environmentally friendly and inexpensive. Moreover, it has richer valence and coordination mode, which has been widely used in the fields of catalysis, ferroelectric, and magnetic materials. [37-39] Among the various valence states of manganese ion, the divalent manganese ion having a 3d 5 electron configuration has a 4 T 1 − 6 A 1 radiative transition closely related to the crystal field strength. The crystal field strength in the metal complex highly depends on the chemical structure of the ligand and the coordination number. These features make the manganese(II) complexes having rich photophysical properties. By regulating the ligand structure, the organic counterion and the coordination number of the manganese(II) complex, the green, yellow, orange, red, or even near-infrared phosphorescence can be achieved. [23-25,36,40] It Phosphorescent manganese(II) complexes are emerging as a new generation of phosphorescent materials showing great potentials in many applications, owing to their unique features including highly efficient phosphorescence, diverse structural/molecular design, and ease of synthesis, structural diversity, rich physical properties (e.g., triboluminescence, stimuli-responsivity, etc.), high abundance, and low cost. The research on phosphorescent manganese(II) complexes is just in its infancy...

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Section: Organic Light-emitting Diodesmentioning

confidence: 99%

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Tao

Liu

Wong

2020

Advanced Optical Materials

100

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“…Achieving near-infrared (NIR) emission is a fundamental and powerful means for numerous applications in the electronic field in modern life, such as night vision, biometric identification, sensor, optical communication, etc ( Qian and Wang, 2010 ; Zampetti et al., 2019 ; Kim et al., 2018b ). Such widespread and essential applications encourage the researchers to develop materials and physical mechanisms for the realization of NIR electroluminescence (EL) via organic light-emitting diodes (OLEDs) ( Chen et al., 2020b ; Zhang et al., 2018 ; Tao et al., 2014 ), which is considered as one of the promising candidates for the next-generation luminescence technology ( Wang et al., 2020 ; Zhang et al., 2020a ; Yang et al., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Harvesting triplet excitons for near-infrared electroluminescence via thermally activated delayed fluorescence channel

Wang

Liu

et al. 2021

iScience

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Near-infrared (NIR) emission is useful for numerous practical applications, such as communication, biomedical sensors, night vision, etc., which encourages researchers to develop materials and devices for the realization of efficient NIR organic light-emitting devices. Recently, the emerging organic thermally activated delayed fluorescence (TADF) emitters have attracted wide attention because of the full utilization of electron-generated excitons, which is crucial for achieving high device efficiency. Up to now, the TADF emitters have shown their potential in the deep red/NIR region. Considering the color purity and efficiency, however, the development of NIR TADF emitters still lags behind RGB TADF emitters, indicating that there is still much room to improve their performance. In this regard, this perspective mainly summarizes the past progress of molecular design on constructing TADF NIR emitters. We hope this perspective could provide a new vista in developing NIR materials and enlighten breakthroughs in both fundamental research and applications.

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“…TADF polymers have excellent modifiability and good thermal stability compared to small molecules. More importantly, narrow band-gap TADF polymers with robust, high film-forming property have emerged, which is extremely beneficial for simple roll-to-roll printing (Wang et al, 2020 ). In addition, compared with small molecules, self-host TADF polymers are more likely to be prepared by rational group modification and structure regulation to solve the phase separation problem of host-guest-doped TADF-OLEDs.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Thermally Activated Delayed Fluorescent Polymer—Molecular Designing Strategies

Yin

Wang

et al. 2020

Front. Chem.

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Thermally activated delayed fluorescent (TADF) materials, as the third generation of organic electroluminescent materials, have many advantages over other organic light-emitting diodes (OLEDs) materials, such as 100% internal quantum efficiency, no doping of heavy metals, and avoiding the shortages of ordinary fluorescent materials and phosphorescent materials. So it is considered to be the most competitive organic light-emitting materials, and has great application prospects in the field of OLEDs. So far, small-molecule TADF materials have achieved high quantum yield and full-color range of red, green, and blue. However, TADF polymers suitable for low-cost and easily scalable solution processing are less developed, which are confined by the preparation methods and polymers designing, and there are still challenges of increasing quantum efficiency and strengthening device performance. This review mainly summarizes different synthesis strategies of TADF polymers and the latest development in the field. Special attention is focused on illustrating the designing and structure-property relationship of TADF polymers, and finally, an outlook is given for the design and application prospect of TADF polymers in the future.

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Towards high-power-efficiency solution-processed OLEDs: Material and device perspectives

Cited by 216 publications

References 440 publications

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Phosphorescent Manganese(II) Complexes and Their Emerging Applications

Harvesting triplet excitons for near-infrared electroluminescence via thermally activated delayed fluorescence channel

Recent Advances in Thermally Activated Delayed Fluorescent Polymer—Molecular Designing Strategies

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