標題: Color tuning associated with heteroleptic cyclometalated Ir(III) complexes: influence of the ancillary ligand
作者: Chang, Chau-Jiun
Yang, Cheng-Han
Chen, Kellen
Chi, Yun
Shu, Ching-Fong
Ho, Mei-Lin
Yeh, Yu-Shan
Chou, Pi-Tai
應用化學系
Department of Applied Chemistry
公開日期: 2007
摘要: We report the preparation of a series of new heteroleptic Ir(III) metal complexes chelated by two cyclometalated 1-(2,4-difluorophenyl) pyrazole ligands (dfpz)H and a third ancillary bidentate ligand ( L. X). Such an intricate design lies in a core concept that the cyclometalated dfpz ligands always warrant a greater pi pi* gap in these series of iridium complexes. Accordingly, the lowest one-electron excitation would accommodate the pi* orbital of the ancillary L(boolean AND)X ligands, the functionalization of which is then exploited to fine-tune the phosphorescent emission wavelengths. Amongst the L. X ligands designed, three classes (series 1-3) can be categorized, and remarkable bathochromic shifts of phosphorescence were observed by (i) replacing the 2-benzoxazol-2-yl-substituent (1a) with the 2-benzothiazol-2-yl group (1b) in the phenolate complexes, (ii) converting the pyridyl group (2a) to the pyrazolyl group (2b) and even to the isoquinolyl group (2c) in the pyrazolate complexes and (iii) extending the pi-conjugation of the benzimidazolate ligand from 3a to 3b. Single-crystal X-ray diffraction study on complex [(dfpz)Ir(bzpz)] (2b) was conducted to confirm their general molecular architectures. Complex 2b was also used as a representative example for fabrication of multilayered, green-emitting phosphorescent OLEDs using the direct thermal evaporation technique.
URI: http://hdl.handle.net/11536/11365
http://dx.doi.org/10.1039/b700998d
ISSN: 1477-9226
DOI: 10.1039/b700998d
期刊: DALTON TRANSACTIONS
Issue: 19
起始頁: 1881
結束頁: 1890
顯示於類別:期刊論文


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