resumo
A series of 4, 6-disubstituted pyrimidine based iridium(III) complexes (1-5), has been synthesized with a simple method. Single X-ray structural analyses were conducted on 5 to reveal their coordination arrangement. These complexes exhibit almost single peak emission with the peak wavelength located in the range of 468-505 nm and quantum yields of over 75%. The relationship between photophysical properties and the substituent nature of the complexes was discussed by density functional theory. Organic light-emitting diodes (OLEDs) were also fabricated using these complexes as dopants in 15 wt%. The green device based on 1 shows a maximum external quantum efficiency, current efficiency, and power efficiency of 9.7%, 46.5 cd A(-1) and 29.0 1m W-1, respectively, while the blue device based on 5 exhibits an external quantum efficiency of up to 14.5%, peak luminance efficiency of 28.0 cd A(-1) and power efficiency of 19.5 1m W-1. Moreover, the Commission Internationale de L'Eclairage (CIE) coordinates of 5 are (0.15, 0.30) which is closer to blue emission than that of FIrpic.
palavras-chave
LIGHT-EMITTING DEVICES; IR(III) COMPLEXES; ANCILLARY LIGANDS; PHOSPHORESCENCE PROPERTIES; AB-INITIO; EFFICIENCY; COLOR; OLEDS; EMISSION; RED
categoria
Chemistry; Engineering; Materials Science
autores
Hu, WK; Li, SH; Ma, XF; Zhou, SX; Zhang, QF; Xu, JY; Shi, P; Tong, BH; Fung, MK; Fu, LS
nossos autores
Lianshe Fu
Investigador Auxiliaragradecimentos
The authors acknowledge financial support from the National Natural Science Foundation of China (21572001, 21372007 and 61475106), the National Key R&D Program of China (No. 2016YFB0400703), the Collaborative Innovation Center of Suzhou Nano Science and Technology, 111 project and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (FCT Ref. UID/CTM/50011/2013), national funds through the FCT/MEC, FEDER under the PT2020 Partnership Agreement and the Anhui Province Undergraduate Innovation and Entrepreneurship Training Program (201710360152, 20171036015).