期刊
CHEMISTRYOPEN
卷 9, 期 1, 页码 14-17出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/open.201900304
关键词
functional supramolecular chemistry; self-assembly; nanostructures; ionic liquids; photon upconversion
资金
- JSPS KAKENHI [JP17H04799, JP16H06513]
Visible-to-ultraviolet (vis-to-UV) triplet-triplet annihilation based photon upconversion (TTA-UC) is achieved in a non-volatile chromophoric ionic liquid (IL) for the first time. A novel IL is synthesized by combining UV-emitting anion 4-(2-phenyloxazol-5-yl)benzenesulfonate (PPOS) and trihexyltetradecylphosphonium cation (P-66614). The nanostructured organization of chromophoric anions is demonstrated by synchrotron X-ray and optical measurements. When the IL is doped with a triplet sensitizer tris(2-phenylpyridinato)iridium(III) (Ir(ppy)(3)), the visible-to-UV TTA-UC with a relatively low threshold excitation intensity of 61 mW cm(-2) is achieved. This is due to a large triplet diffusion coefficient in the IL (1.4x10(-7) cm(2) s(-1)) as well as a high absorption coefficient 15 cm(-1) and a long PPOS triplet lifetime of 1.55 ms, all implemented in the condensed IL system. This work demonstrates the unique potential of ILs to control chromophore arrangements for desired functions.
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