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Stable Blue Phosphorescence Iridium(III) Cyclometalated Complexes Prompted by Intramolecular Hydrogen Bond in Ancillary Ligand

Authors
Yi, SeungjunKim, Jin-HyoungCho, Yang-JinLee, JiwonChoi, Tae-SupCho, Dae WonPac, ChyongjinHan, Won-SikSon, Ho-JinKang, Sang Ook
Issue Date
4-4월-2016
Publisher
AMER CHEMICAL SOC
Citation
INORGANIC CHEMISTRY, v.55, no.7, pp.3324 - 3331
Indexed
SCIE
SCOPUS
Journal Title
INORGANIC CHEMISTRY
Volume
55
Number
7
Start Page
3324
End Page
3331
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/88939
DOI
10.1021/acs.inorgchem.5b02511
ISSN
0020-1669
Abstract
Improvement of the stability of blue phosphorescent dopant material is one of the key factors for real application of organic light-emitting diodes (OLEDs). In this study, we found that the intramolecular hydrogen bonding in an ancillary ligand from a heteroleptic Ir(III) complex can play an important role in the stability of blue phosphorescence. To rationalize the role of intramolecular hydrogen bonding, a series of Ir(III) complexes is designed and prepared: Ir(dfppy)(2)(pic-OH) (1a), Ir(dfppy)(2)-(pic-OMe) (1b), Ir(ppy)(2)(pic-OH) (2a), and Ir(ppy)(2)(pic-OMe) (2b). The emission lifetime of Ir(dfppy)(2)(pic-OH) (1a) (tau(em) = 3.19 mu s) in dichloromethane solution was found to be significantly longer than that of Ir(dfppy)(2)(pic-OMe) (1b) (tau(em) = 0.94 mu s), because of a substantial difference in the nonradiative decay rate (k(nr) = 0.28 x 10(5) s(-1) for (1a) vs 2.99 X 10(5) s(-1) for (1b)). These results were attributed to the intramolecular OH center dot center dot center dot O=C hydrogen bond of the 3-hydroxy-picolinato ligand. Finally, device lifetime was significantly improved when 1a was used as the dopant compared to FIrpic, a well-known blue dopant. Device III (1a as dopant) achieved an operational lifetime of 34.3 h for an initial luminance of 400 nits compared to that of device IV (FIrpic as dopant), a value of 20.1 h, indicating that the intramolecular hydrogen bond in ancillary ligand is playing an important role in device stability.
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