resumo
Two one-pot methods have been used to synthesize various homoleptic phenylpyridazine iridium (III) complexes (2-4). The coordination arrangements of 2 and 3 were revealed by carrying out single X-ray structural analyses. These complexes showed green emission. Their peak wavelengths ranged from 508 to 538 nm with quantum yields greater than 70%. Density functional theory (DFT) was used to discuss the correlation between substituent nature and photophysical characteristics of these complexes. Organic light-emitting diodes (OLEDs) were fabricated by taking 2-4 as dopants. The green device based on complex 4 shows a maximum current efficiency and external quantum efficiency of 78.6 cd A(-1) and 21.9%, respectively, and mild efficiency roll-off. The results suggest that these homoleptic phenylpyridazine iridium(III) complexes have potential application as efficient emitters in OLEDs.
palavras-chave
LIGHT-EMITTING DIODE; PHOSPHORESCENT OLEDS; FLUORESCENCE PROPERTIES; AB-INITIO; ELECTROPHOSPHORESCENCE; LIGANDS; THERMOCHEMISTRY; CYCLOADDITION; DERIVATIVES
categoria
Materials Science; Physics
autores
Chen, M; Wang, LD; Wang, Y; Zhou, YY; Hu, CG; Tong, BH; Bian, ZQ; Fu, LS; Zhang, QF; Wang, P
nossos autores
Lianshe Fu
Investigador Auxiliaragradecimentos
The authors would like to express the gratitude to financial support from the National the project CICECO-Aveiro Institute of Materials, National Natural Science Foundation of China (21572001), national funds through the FCT/MEC, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), and FEDER under the PT2020 Partnership Agreement.