Near-Infrared Emitting Materials via Harvesting Triplet Excitons: Molecular Design, Properties, and Application in Organic Light Emitting Diodes

2018 ◽  
Vol 6 (18) ◽  
pp. 1800466 ◽  
Author(s):  
Youming Zhang ◽  
Yafei Wang ◽  
Jun Song ◽  
Junle Qu ◽  
Buhong Li ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light ◽  
Triplet Excitons

scholarly journals Recent advances in phosphorescent platinum complexes for organic light-emitting diodes

2018 ◽  
Vol 14 ◽  
pp. 1459-1481 ◽  
Author(s):  
Cristina Cebrián ◽  
Matteo Mauro
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Internal Quantum Efficiency ◽  
Visible Spectrum ◽  
Platinum Complexes ◽  
Organic Light Emitting Diodes ◽  
Application Development ◽  
Light Emitting ◽  
Organic Light

Phosphorescent organometallic compounds based on heavy transition metal complexes (TMCs) are an appealing research topic of enormous current interest. Amongst all different fields in which they found valuable application, development of emitting materials based on TMCs have become crucial for electroluminescent devices such as phosphorescent organic light-emitting diodes (PhOLEDs) and light-emitting electrochemical cells (LEECs). This interest is driven by the fact that luminescent TMCs with long-lived excited state lifetimes are able to efficiently harvest both singlet and triplet electro-generated excitons, thus opening the possibility to achieve theoretically 100% internal quantum efficiency in such devices. In the recent past, various classes of compounds have been reported, possessing a beautiful structural variety that allowed to nicely obtain efficient photo- and electroluminescence with high colour purity in the red, green and blue (RGB) portions of the visible spectrum. In addition, achievement of efficient emission beyond such range towards ultraviolet (UV) and near infrared (NIR) regions was also challenged. By employing TMCs as triplet emitters in OLEDs, remarkably high device performances were demonstrated, with square planar platinum(II) complexes bearing π-conjugated chromophoric ligands playing a key role in such respect. In this contribution, the most recent and promising trends in the field of phosphorescent platinum complexes will be reviewed and discussed. In particular, the importance of proper molecular design that underpins the successful achievement of improved photophysical features and enhanced device performances will be highlighted. Special emphasis will be devoted to those recent systems that have been employed as triplet emitters in efficient PhOLEDs.

scholarly journals Deep-Red and Near-Infrared Iridium Complexes with Fine-Tuned Emission Colors by Adjusting Trifluoromethyl Substitution on Cyclometalated Ligands Combined with Matched Ancillary Ligands for Highly Efficient Phosphorescent Organic Light-Emitting Diodes

Molecules ◽  
2022 ◽  
Vol 27 (1) ◽  
pp. 286
Author(s):  
Shuonan Chen ◽  
Hai Bi ◽  
Wenjing Tian ◽  
Yu Liu
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Infrared Region ◽  
Organic Light Emitting Diodes ◽  
Iridium Complexes ◽  
Light Emitting ◽  
Practical Applications ◽  
Organic Light ◽  
Near Infrared Region

Six novel Ir(C^N)2(L^X)-type heteroleptic iridium complexes with deep-red and near-infrared region (NIR)-emitting coverage were constructed through the cross matching of various cyclometalating (C^N) and ancillary (LX) ligands. Here, three novel C^N ligands were designed by introducing the electron-withdrawing group CF3 on the ortho (o-), meta (m-), and para (p-) positions of the phenyl ring in the 1-phenylisoquinoline (piq) group, which were combined with two electron-rich LX ligands (dipba and dipg), respectively, leading to subsequent iridium complexes with gradually changing emission colors from deep red (≈660 nm) to NIR (≈700 nm). Moreover, a series of phosphorescent organic light-emitting diodes (PhOLEDs) were fabricated by employing these phosphors as dopant emitters with two doping concentrations, 5% and 10%, respectively. They exhibited efficient electroluminescence (EL) with significantly high EQE values: >15.0% for deep red light0 (λmax = 664 nm) and >4.0% for NIR cases (λmax = 704 nm) at a high luminance level of 100 cd m−2. This work not only provides a promising approach for finely tuning the emission color of red phosphors via the easily accessible molecular design strategy, but also enables the establishment of an effective method for enriching phosphorescent-emitting molecules for practical applications, especially in the deep-red and near-infrared region (NIR).

P-170: Molecular Design of Sensitizer for High Efficiency in Hyper-fluorescent Organic Light-Emitting Diodes

2018 ◽  
Vol 49 (1) ◽  
pp. 1800-1803
Author(s):  
Ji Seon Jang ◽  
Si Hyun Han ◽  
Hye Won Choi ◽  
Kyoung Soo Yook ◽  
Jun Yeob Lee
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Organic Light

Efficient near-infrared organic light-emitting diodes based on a bipolar host

2018 ◽  
Vol 6 (6) ◽  
pp. 1407-1412 ◽  
Author(s):  
Yun Hu ◽  
Yi Yuan ◽  
Ying-Li Shi ◽  
Jiu-Dong Lin ◽  
Zuo-Quan Jiang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Light Emitting Diodes ◽  
Emission Peak ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Type Host ◽  
Organic Light ◽  
Donor Acceptor

A maximum EQE of 2.7% with an emission peak of 735 nm was achieved by employing a donor–acceptor type host 5-(4-(diphenylamino)phenyl)acenaphthylene-1,2-dione (ADO-TPA).

Phenanthroimidazole-Based Organic Fluorophores for Organic Light-Emitting Diodes

2018 ◽  
pp. 305-388
Author(s):  
Sivakumar Vaidyanathan ◽  
Jairam Tagare
Keyword(s):  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Energy Utilization ◽  
Light Emitting ◽  
Design And Synthesis ◽  
Organic Light ◽  
Color Displays ◽  
Host Materials ◽  
Yellow Orange

Considering the imminent global energy crisis and inefficient energy utilization, energy-efficient organic light-emitting diodes (OLEDs) are considered one of the most competitive candidates for displays and particularly for future energy-saving lighting sources. Full color displays require all primary colors: red, green, and blue (RGB). In recent decades, numerous phenanthroimidazole (PI) RGB-emitting materials have been developed for efficient OLEDs. In organic electronics, considerable interest is shown on PI, due to ease in fluorophore modification. This chapter focuses on the design and synthesis of PI-based materials and their applications in OLEDs. At first, some nondoped blue, green, and yellow fluorescent materials are comprehensively studied. Then attention has been paid for typical blue, green, yellow, orange, and red PhOLEDs of PI-based fluorophores as a host materials are briefly presented. The molecular design concept, general synthetic routes for PI materials, and the applications of fluorophores in fluorescent OLEDs and host materials in PhOLEDs are reviewed.

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