Recent progress of pyrimidine derivatives for high-performance organic light-emitting devices

Abstract

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.

The effect of protonation on the excited state dynamics of pyrimidine chromophores

“…These heterocycles constitute electron accepting groups in D-π-A structures which result in efficient Intramolecular Charge Transfer (ICT) and are potential candidates for application in optoelectronics, sensors and non-linear optics. [38][39][40][41][42][43][44][45][46][47][48][49] Protonation strengthens their electron accepting ability, enhancing the ICT.…”

High Performance Thermally Activated Delayed Fluorescence Sensitized Organic Light‐Emitting Diodes

“…To produce high performance TADF-sensitized OLEDs, both emitting layers (EMLs) and charge transport layers should be optimized. [24][25][26][27][28] Among them, TADF hosts are the most important. In this paper, we review our recent efforts in designing three types of TADF-sensitized OLEDs.…”

“…[80] Here, 1,3-dihydro-3,3-dimethylindeno [2,1-b]carbazole (DMIC) with high hole mobility and 1,3,5-triazine (TRZ) with high electron mobility serve as donor and acceptor units, repectively (Figure 13). [25,28] High T 1 energy level, balanced electron and hole mobilities, moderate FMO energy levels make DMIC-TRZ good hosts for full-color TADF emitters. Here, 5TCzBN, bis(4-(9,9-dimethylacridin-10(9H)-yl) phenyl)methanone (DMAC-BP) and 3,4,5,6-Tetrakis(3,6ditert-butyl-9H-carbazol-9-yl)benzene-1,2-dinitrile (4TCzTPN) served as sky-blue, green and orange emitters to match with DMIC-TRZ for the fabrication TST OLEDs, respectively.…”

Molecular Orientations of Delayed Fluorescent Emitters in a Series of Carbazole-Based Host Materials

“…A series of fluorescent emitters exhibiting significant delayed fluorescence, so-called thermally activated delayed fluorescent (TADF) emitters, has attracted much attention due to its potential usefulness in high-performance organic light-emitting devices (OLEDs) that can realize an internal quantum efficiency (η int ) of 100% (Uoyama et al, 2012;Sasabe and Kido, 2013;Adachi, 2014;Kaji et al, 2015;Lin et al, 2016;Im et al, 2017;Wong and Zysman-Colman, 2017;Yang et al, 2017;Komatsu et al, 2018). In principle, TADF emitters consist of electron-donor (D) and electronacceptor (A) moieties realizing efficient intramolecular charge transfer (ICT).…”