Abstract
Pyrimidine is an electron-deficient azaaromatic compound containing two nitrogen atoms at 1, 3-positions that plays a key role as an organic semiconductor or semiconducting material. Because of the high electron-accepting property induced by C═N double bonds and due to its coordination ability, pyrimidine has been incorporated as a building block in phosphorescent emitters, fluorescent emitters, bipolar host materials, and electron transporting materials in organic light-emitting devices (OLEDs). Recently, pyrimidine-based thermally activated delayed fluorescent emitters combined with various electron donors have been developed, and their device performances were far better than those based on conventional fluorescent emitters. In this review, recent progress of pyrimidine-based OLED materials is presented and accompanied by a historical overview, current status, key issues, and outlook for the next generation of high-performance OLED materials.
Highlights
Generation displays and lighting resources have focused on using organic light-emitting devices (OLEDs) because of their outstanding features, such as having low power consumption and being flat, ultra thin, and light weight.[1,2,3,4,5,6,7,8] flexible and transparent OLEDs can be fabricated, and printable OLEDs can be used in future applications
The efficiency of the thermally activated delayed fluorescence (TADF)-based OLEDs is expected to exceed that of OLEDs based on phosphorescent emitters due to the unlimited molecular design of pyrimidine derivative-based TADF emitters
These results clearly demonstrate the advantage of using pyrimidine-based bipolar host materials in phosphorescent OLEDs with long-term stability
Summary
Generation displays and lighting resources have focused on using organic light-emitting devices (OLEDs) because of their outstanding features, such as having low power consumption and being flat, ultra thin, and light weight.[1,2,3,4,5,6,7,8] flexible and transparent OLEDs can be fabricated, and printable OLEDs can be used in future applications. Triazine is one of the most famous acceptor units.[33,34,35,36] Until now, Adachi et al. Komatsu, Sasabe, and Kido: Recent progress of pyrimidine derivatives for high-performance. Reported a series of triphenyltriazine-based emitters that realizes an EQE of over 30% and that emits color range from blue to orange.[33,34,35,36] the stronger electron-accepting character of triazine compared with other azaaromatic compounds, such as pyridine, pyradine, and pyrimidine, tends to make the emission peak wavelength longer, causing a problem in the development of deep-blue emitters. This review presents recent progress in the development of pyrimidine derivatives for OLEDs as well as a historical overview, current status, key issues, and outlook for the generation of high-performance OLED
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