Photophysical Properties and Energy Transfer Pathway of Er(III) Complexes with Pt-Porphyrin and Terpyridine Ligands
详细信息 查看全文
- 作者：Min-Kook Nah ; Jae Buem Oh ; Hwan Kyu Kim ; Kyong-Hoon Choi ; Yong-Rok Kim ; Jun-Gill Kang
- 刊名：Journal of Physical Chemistry A
- 出版年：2007
- 出版时间：July 19, 2007
- 年：2007
- 卷：111
- 期：28
- 页码：6157 - 6164
- 全文大小：225K
- 年卷期：v.111,no.28(July 19, 2007)
- ISSN：1520-5215
文摘
The photophysical properties of Er(III) complexes coordinated with platinum[5,10,15-triphenyl-20-(4-carboxyphenyl)-porphyrin] (PtP) and terpyridine (tpy) ligands in organic solution were investigated. The Er(III) complex emitted sensitized near-IR (NIR) luminescence when the PtP ligands were excited underdeoxygenated conditions. The quantum yield (
Ln) of the sensitized luminescence was 0.015%, as evaluatedfrom luminescence lifetime. The photophysical studies and theoretical calculations suggest that the Försterresonance mechanism is very suitable for the energy transfer from PtP to the Er(III) ion and occurred throughthe first triplet excited state of PtP. The 12.3% energy transfer from the triplet state to the 4F9/2 and 4I9/2 statesof Er(III) occurred with a rate distribution of 3.36 × 105 and 6.67 × 104 s-1, respectively. In addition, theobserved triplet quantum yield of the PtP ligand in [Ln(PtP)3(tpy)] proved that the energy transfer from thesinglet excited state of the PtP ligand to the Er(III) ion did not take place.
Ln) of the sensitized luminescence was 0.015%, as evaluatedfrom luminescence lifetime. The photophysical studies and theoretical calculations suggest that the Försterresonance mechanism is very suitable for the energy transfer from PtP to the Er(III) ion and occurred throughthe first triplet excited state of PtP. The 12.3% energy transfer from the triplet state to the 4F9/2 and 4I9/2 statesof Er(III) occurred with a rate distribution of 3.36 × 105 and 6.67 × 104 s-1, respectively. In addition, theobserved triplet quantum yield of the PtP ligand in [Ln(PtP)3(tpy)] proved that the energy transfer from thesinglet excited state of the PtP ligand to the Er(III) ion did not take place.