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

Yi, Seungjun; Kim, Jin-Hyoung; Cho, Yang-Jin; Lee, Jiwon; Choi, Tae-Sup; Cho, Dae Won; Pac, Chyongjin; Han, Won-Sik; Son, Ho-Jin; Kang, Sang Ook

doi:10.1021/acs.inorgchem.5b02511

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

Inorganic chemistry, v.55 no.7, 2016년, pp.3324 - 3331

Yi, Seungjun (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,) , Kim, Jin-Hyoung (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,) , Cho, Yang-Jin (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,) , Lee, Jiwon (Department of Chemistry, Seoul Women’s University, Seoul 01797,) , Choi, Tae-Sup (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,) , Cho, Dae Won (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,) , Pac, Chyongjin (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,) , Han, Won-Sik (Department of Chemistry, Seoul Women’s University, Seoul 01797,) , Son, Ho-Jin (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,) , Kang, Sang Ook (Department of Advanced Materials Chemistry, Korea University, Sejong 30019,)

Abstract ▼ AI-Helper

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

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

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