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首页> 外文期刊>Optical Materials >Optical properties of Er~(3+) in fullerenes and in β-PbF_2 single-crystals
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Optical properties of Er~(3+) in fullerenes and in β-PbF_2 single-crystals

机译：富勒烯和β-PbF_2单晶中Er〜（3+）的光学性质

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摘要

With the aim of providing a thorough description of the optical properties of Er~(3+)-doped endohedral fullerenes, we studied their characteristics in the light of those of well-known Er~(3+)-doped β-PbF_2 single-crystals. Various Er~(3+)-doped endohedral fullerenes were considered: Er_2C_2@C_(82). where the Er_2C_2 group is encapsulated inside a cage of 82 carbon atoms and the Er_(3-x)Sc_xN@C_(80) (x= 0, 1 and 2) family, where the Er_3N, Er_2ScN and ErSc_2N clusters are trapped in a 80 carbon atom cage. In this article, we discuss the absorption and photoluminescence of trivalent erbium ions in fullerenes and in β-PbF_2 crystals. The extinction coefficient of Er_3N@C_(80) was found to be 4.8 (±0.5) × 10~3 mol/l~(-1) cm~(-1) at 540 nm. due to the C_(80) cage absorbance. Even in a saturated fullerene solution, the absorption of Er~(3+) encapsulated inside a C_(80) cage cannot be observed at room temperature. We suggest that this is due to an insufficient number of Er~(3+) ions in the solution and their low absorption cross-section. Low temperature photoluminescence measurements show that the line width of Er~(3+) in a carbon cage, dissolved in a polycrystalline solvent, is similar to the one of Er~(3+) in β-PbF_2 single-crystals. The quantum efficiency of Er~(3+) at 1.5 nm in fullerenes is four orders of magnitude lower than that for Er~(3+) in crystals, due to very efficient non-radiative decay processes. Molecular vibrations of the cage might be responsible for those rapid non-radiative de-excitations.
机译：为了全面描述掺Er〜（3+）的内面富勒烯的光学性质，我们根据著名的掺Er〜（3+）的β-PbF_2单-苯并噻吩对它们的特性进行了研究。晶体。各种掺Er〜（3+）的内面富勒烯被认为是：Er_2C_2 @ C_（82）。其中Er_2C_2基团封装在82个碳原子的笼子中，并且Er_（3-x）Sc_xN @ C_（80）（x = 0、1和2）族，其中Er_3N，Er_2ScN和ErSc_2N簇被困在80个碳原子的笼子。在本文中，我们讨论了富勒烯和β-PbF_2晶体中三价离子的吸收和光致发光。 Er_3N @ C_（80）的消光系数在540 nm下为4.8（±0.5）×10〜3 mol / l〜（-1）cm〜（-1）。由于C_（80）笼吸收。即使在饱和的富勒烯溶液中，室温下也无法观察到包裹在C_（80）笼中的Er〜（3+）的吸收。我们认为这是由于溶液中Er〜（3+）离子数量不足以及其吸收截面低所致。低温光致发光测量表明，溶解在多晶溶剂中的碳笼中Er〜（3+）的线宽类似于β-PbF_2单晶中Er〜（3+）的线宽。在富勒烯中，Er〜（3+）在1.5 nm处的量子效率比晶体中Er〜（3+）的量子效率低四个数量级，这是由于非常有效的非辐射衰变过程所致。笼子的分子振动可能是那些快速的非辐射去激励的原因。

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