You Youngmin, Park Soo Young
School of Materials Science and Engineering, Seoul National University, San 56-1, Shillim-Dong, Kwanak-Gu, Seoul 151-744, Korea.
J Am Chem Soc. 2005 Sep 14;127(36):12438-9. doi: 10.1021/ja052880t.
We report a novel color tuning methodology in the electrophosphorescent iridium complex by substituting one cyclometalating ligand to an ancillary ligand as an emitting center. Highly efficient exothermic inter-ligand energy transfer (ILET) from the MLCT3 state produced between iridium and cyclometalating 2-(2,4-difluorophenyl)pyridine to LX3 state of the ancillary ligand offers a chance to access a wider range of color from sky blue (478 nm) to red (666 nm). Characteristic shapes of photoluminescence spectra, strong solvatochromic phenomena as well as DFT calculations gave evidences for this exothermic ILET.
我们报道了一种新型的电磷光铱配合物颜色调谐方法，即将一个环金属化配体替换为辅助配体作为发光中心。铱与环金属化的2-(2,4-二氟苯基)吡啶之间产生的MLCT3态向辅助配体的LX3态进行高效放热配体内能量转移（ILET），为获得从天蓝（478 nm）到红色（666 nm）更宽的颜色范围提供了机会。光致发光光谱的特征形状、强烈的溶剂化显色现象以及密度泛函理论计算为这种放热ILET提供了证据。
