CHIN-HUNG LAI2026-10-162026-10-162010-09-13Pure ID: 15460006Pure UUID: ab1b608d-d0cd-419e-86d2-65dcfbb33ad410.1021/om100573rhttps://www.scopus.com/pages/publications/77956413831https://scholars.csmu.edu.tw/handle/123456789/23438A new series of lepidine-containing-ligand-based cyclometalated platinum(II) complexes 1-7 with general formula [Pt(L)acac] (L = lepidine-based ligand, acac = acetylacetonate) have been synthesized. The complexes have been characterized using spectral and electrochemical techniques. The single-crystal X-ray structures of complexes 2 and 5 have been successfully determined. The effects of substituents on the electronic features and redox potentials of the cyclometalated phenyl ring of the complexes are discussed. Complexes 1-7 are highly phosphorescent in fluid as well as in solid state, covering a rather broad spectral range from yellow to saturated red. These complexes were successfully used as a dopant material to fabricate the electroluminescent device, ITO/NPB (40 nm)/CBP-doped Pt complex (5 wt %) (20 nm)/BCP (10 nm)/Alq3 (20 nm)/LiF (1 nm)/Al (150 nm), which exhibits very promising performance. The device doped with 5 wt % 3 produced a maximum external quantum efficiency of 15.2% with a maximum brightness of 26847 cd m-2 and corresponds to a luminance efficiency of 29.83 cd A -1.10enjournal article