We have observed that C₆₀⁺ ions isolated in cryogenic matrices show distinct near-IR photoluminescence upon excitation in the near-IR range. By contrast, UV photoexcitation does not lead to measurable luminescence. Near-IR C₆₀⁺ photoluminescence is a one-photon process. The emission is mainly concentrated in one band and corresponds to ²A_1u ← ²E_1g relaxation. We present experimental data for the Stokes shift, power, and temperature dependencies as well as the quantum efficiency of the photoluminescence. Our findings may be relevant for astronomy, considering recent unequivocal assignment of five diffuse interstellar bands to near-IR absorption bands of C₆₀⁺.

中文翻译：

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C ₆₀ ^+的近红外光致发光

我们已经观察到低温基质中分离出的C ₆₀ ⁺离子在近红外范围内激发后显示出明显的近红外光致发光。相比之下，UV光激发不会导致可测量的发光。近红外C ₆₀ ⁺光致发光是一种单光子过程。发射主要集中在一个频带内，对应于² A _1u ← ² E _1g弛豫。我们提供了斯托克斯位移，功率和温度依赖性以及光致发光的量子效率的实验数据。考虑到最近五个星际漫射带明确地分配给C的近红外吸收带，我们的发现可能与天文学有关₆₀ ⁺。