132932-65-1Relevant articles and documents
A new benzothienoindole-based bipolar host material for efficient green phosphorescent organic light-emitting diodes with extremely small efficiency roll-off
Konidena, Rajendra Kumar,Lee, Kyung hyung,Lee, Jun Yeob,Hong, Wan Pyo
, p. 211 - 218 (2019)
In this contribution, two new hole-transport units, 10H-benzo[4,5]thieno[3,2-b]indole (BTI) and 10H-benzofuro[3,2-b]indole (BFI), were developed to design and synthesize bipolar host materials namely 10-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-10H-benzo[4,5]thieno[3,2-b]indole.(mBTITrz) and 10-(3-(4,6-diphenyl-1,3,5-triazin-2-yl)phenyl)-10H-benzofuro[3,2-b]indole.(mBFITrz), for phosphorescent organic light-emitting diodes (PHOLEDs). The effect of heteroatoms in the hole-transport unit on the physicochemical and electroluminescence properties of the hosts were investigated in detail. Interestingly, the phosphorescence of the compounds was highly dependent on the hole-transport unit, because it originated from their local excited state (3LE), which was attributed to the interrupted strong electronic communication between donor and acceptor units by meta-mode of conjugation on the phenyl linker. Consequently, the mBTITrz showed high triplet energy (ET) of ～2.88 eV compared to its counterpart mBFITrz (ET ～ 2.65 eV). Both compounds displayed marked thermal stability with high thermal decomposition temperatures of above 410 °C and glass-transition temperatures of above 103 °C. In addition, the single carrier device studies revealed a bipolar charge transporting character for the compounds. Furthermore, the compounds were evaluated as bipolar hosts for green PHOLEDs by employing Ir(ppy)3 dopant. The mBTITrz-hosted device demonstrated much better performance than did the mBFITrz-hosted device, with a maximum external quantum efficiency of 21.3% and maximum current efficiency of 76.0 cd/A. Notably, the mBTITrz-based device exhibited excellent efficacy stability with uncompromised efficiency roll-off at 1000 cd/m2 and an extremely low efficiency roll-off of 3.2% at 5000 cd/m2 and 9.0% at 10,000 cd/m2.
Triggering Thermally Activated Delayed Fluorescence by Managing the Heteroatom in Donor Scaffolds: Intriguing Photophysical and Electroluminescence Properties
Konidena, Rajendra Kumar,Lee, Kyung Hyung,Lee, Jun Yeob,Hong, Wan Pyo
, p. 2251 - 2258 (2019)
Establishment of the structure–property relationships of thermally activated delayed fluorescence (TADF) materials has become a significant quest for the scientific community. Herein, two new donors, 10H-benzofuro[3,2-b]indole (BFI) and 10H-benzo[4,5]thie
Eco-friendly solvents for palladium-catalyzed desulfitative C-H bond arylation of heteroarenes
Hfaiedh, Anoir,Yuan, Kedong,Ben Ammar, Hamed,Ben Hassine, Bechir,Soulé, Jean-Fran?ois,Doucet, Henri
, p. 1794 - 1804 (2015/06/02)
Herein, we report the Pd-catalyzed regioselective direct arylation of heteroarenes in which benzenesulfonyl chlorides are used as coupling partners through a desulfitative cross-coupling that can be performed in diethyl carbonate (DEC) or cyclopentyl methyl ether (CPME) as green and renewable solvents or even in neat conditions instead of dioxane or dimethylacetamide (DMA). Under these solvent conditions, the reaction proceeds with a wide range of heteroarenes. C2- or C5-arylated products were obtained with furan and pyrrole derivatives. Benzofuran was also arylated regioselectively at the C2-position, whereas the reaction proceeds selectively at the C3- or C4-positions if thiophenes and benzothiophenes are used. Moreover, in some cases, especially with 1-methylindole, solvent-free conditions afforded better regioselectivities and/or yields than the reaction performed in the presence of solvents.
