Detailed Information

Cited 0 time in webofscience Cited 0 time in scopus
Metadata Downloads

Blue Phosphorescence with High Quantum Efficiency Engaging the Trifluoromethylsulfonyl Group to Iridium Phenylpyridine Complexes

Authors
Kim, Jin-HyoungKim, So-YoenJang, SeolYi, SeungjunCho, Dae WonSon, Ho-JinKang, Sang Ook
Issue Date
2-12월-2019
Publisher
AMER CHEMICAL SOC
Citation
INORGANIC CHEMISTRY, v.58, no.23, pp.16112 - 16125
Indexed
SCIE
SCOPUS
Journal Title
INORGANIC CHEMISTRY
Volume
58
Number
23
Start Page
16112
End Page
16125
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/60965
DOI
10.1021/acs.inorgchem.9b02672
ISSN
0020-1669
Abstract
Incorporation of an electron-withdrawing -SO2CF3 substituent to cyclometalating C<^>N-phenylpyridine (ppy) ligand resulted in an expected blue-shifted phosphorescence in the corresponding homoleptic Ir(ppySCF(3))(3) complex, showing the emission of lambda(em) = 464 nm at 300 K. One of its heteroleptic derivatives, modified by a pyrazolyl borate LX ligand, Ir(ppySCF(3))(2)(bor), exhibited further blue-shifted phosphorescence of lambda(em) = 460 nm at 300 K. Cyclic voltammograms (CVs) and density-functional theory (DFT) calculations supported the efficacy of the electron-withdrawing capability of the SO2CF3 substituent lowering HOMO energy and obtained widened bandgaps and resumed blue emissions for all of the iridium complexes studied. The homoleptic complexes of both substituents, Ir(ppySCF(3))(3) and Ir(ppySF)(3), reached the higher quantum yields (Phi(PL)) of (0.89 and 0.72), respectively. Similarly, emission quantum yields (Phi(PL)) of the heteroleptic derivatives were reported to be (0.75, 0.83, and 0.87) for Ir(ppySCF(3))(2)(acac), Ir(ppySCF(3))(2)(bor), and Ir(ppySCF(3))(2)(pic), respectively. Emission kinetics support the enhanced quantum efficiency when k(r) and k(nr) values are compared between Ir(ppySCF(3))(3) and Ir(ppySF)(3), and both values favorably contribute to attaining a higher quantum efficiency for Ir(ppySCF(3))(3). Among solution-processed multilayered devices having an ITO/PEDOT:PSS/TCTA:Ir dopant (10:1, w/w)/TmPyPB/Liq/Al structure, a heteroleptic dopant, Ir(ppySCF(3))(2)(bor), exhibited better device performance, reporting an external quantum efficiency (EQE) of 1.14%, current efficiency (CE) of 2.31 cd A(-1), and power efficiency (PE) of 1.21 lm W-1, together with blue chromaticity of CIEx,y = (0.16, 0.32).
Files in This Item
There are no files associated with this item.
Appears in
Collections
Graduate School > Department of Advanced Materials Chemistry > 1. Journal Articles

qrcode

Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.

Altmetrics

Total Views & Downloads

BROWSE