Luminescence and upconversion from thulium(III) species in solution
Luminescence and upconversion from thulium(III) species in solution
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DOI：
10.1039/c2cp42228
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发表时间：
2012-01-01
影响因子：
3.3
通讯作者：
Faulkner, Stephen
中科院分区：
文献类型：
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作者：
Blackburn, Octavia A.;Tropiano, Manuel;Faulkner, Stephen
铥盐和配合物在Tm3+的激发态流形中有三态发射。D-1(2)态的形成可以导致发光，或者导致能量转移到低能量(1)G(4)和H-3(4)发射态。当配体结构中存在发色团时，发射仅限于以铥为中心的发射态，其能量低于以发色团为中心的供体态。我们还观察到铥激发态流形的直接多光子激发。此外，在多光子激发光谱中观察到额外的跃迁，这些跃迁与上转换一致，这是铥激发态流形内顺序单光子吸收和弛豫过程的结果。
Thulium salts and complexes are shown to be emissive from three states in the excited state manifold of Tm3+. Formation of the D-1(2) state can result in luminescence, or in energy transfer to the lower energy (1)G(4) and H-3(4) emissive states. Where chromophores are present in the ligand structure, emission is restricted to thulium centred emissive states that are lower in energy than the chromophore centred donor state. We have also observed direct multi-photon excitation of the thulium excited state manifold. Furthermore, additional transitions are observed in the multi-photon excitation spectra that are consistent with upconversion as a consequence of sequential single photon absorption and relaxation processes within the thulium excited state manifold.