期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 2013, 期 27, 页码 4754-4763出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201300595
关键词
Iridium; Phosphorescence; Thiazole; Photochemistry; Organic light-emitting diodes; Luminescence
资金
- Tengfei Project from Xi'an Jiaotong University, Shaanxi Province [2009JQ2008]
- National Natural Science Foundation of China [20902072]
- Program for New Century Excellent Talents in University
- Ministry of Education of China [NECT-09-0651]
- Hong Kong Baptist University [FRG2/11-12/156]
- Hong Kong Research Grants Council [HKBU202410, HKUST2/CRF/10]
- Areas of Excellence Scheme from the University Grants Committee of HKSAR, China [AoE/P-03/08]
- National Basic Research Program of China (973 Program) [2013CB834702]
Tris(cyclometalated) iridium(III) phosphorescent emitters with 2-phenylthiazole-type ligands have been designed and synthesized. Their photophysical properties, electrochemical behavior and electroluminescent (EL) performance can be influenced by introducing fluorine atoms to the phenyl moiety of the thiazole-based ligands. The phosphorescent emission maxima can be shifted from 546 nm to 517 nm by increasing the number of the fluorine atoms attached to the ligands of the iridium(III) complexes. Furthermore, the HOMO levels for these phosphorescent complexes exhibit a gradual decrease from -5.28 eV to -5.59 eV with the introduction of fluorine atoms. Owing to the character of their electronic structures, the phosphorescent emitters are preferentially excited by means of a host-guest energy-transfer process in the organic light-emitting diodes (OLEDs). Accordingly, their EL performance is strictly restricted by the triplet energy level difference between the phosphorescent dopant and the host materials. The thiazole-based cyclometalated iridium(III) triplet emitters can exhibit maximum EL efficiencies with (ext) = 7.87%, (L) = 23.62 cdA(-1) and (p) = 13.46 lmW(-1).
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