Color Tuning of Iridium Complexes through Heteroleptic Tris-cyclometallated Ligands
- Authors
- Kim, In June; Kim, Young Sik
- Issue Date
- 2009
- Publisher
- TAYLOR & FRANCIS LTD
- Keywords
- cyclometallated iridium (III) complex; organic light-emitting devices (OLEDs)
- Citation
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS, v.514, pp.385 - 393
- Journal Title
- MOLECULAR CRYSTALS AND LIQUID CRYSTALS
- Volume
- 514
- Start Page
- 385
- End Page
- 393
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/22609
- DOI
- 10.1080/15421400903217801
- ISSN
- 1542-1406
- Abstract
- White organic light-emitting devices (WOLEDs) consist of a fluorescent blue material doped in a region spatially separate from the phosphorescent dopant iridium complex. This study evaluated two potential new phosphorescent materials, the heteroleptic tris-cyclometallated iridium complexes Ir(tpy)(2)(btp) and Ir(btp)(2)(tpy), where tpy and btp are "2-(p-tolyl)pyridine'' and "2-(2'-benzothienyl) pyridine'', respectively. The luminescence mechanism in heteroleptic iridium complexes is determined by the rates of decay from two different species of ligands. The quantum yields (lifetime) of fac-Ir(tpy)(3) and fac-Ir(btp)(3) were reported as 0.5 (2.0 mu s) and 0.12 (4.0 mu s), respectively. Thus, the radiative decay rate (k(r)) of fac-Ir(tpy)(3) and fac-Ir(btp)(3) can be calculated as 2.5 x 10(5)/s and 3.0 x 10(4)/s, respectively. Heteroleptic tris-cyclometallated iridium complexes were able to tune the color for white phosphorescent materials, by controlling the radiative decay rate of ligands and number of ligands in complexes.
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