Single-bubble sonoluminescence of colloidal suspensions in dodecane of SiO₂ nanoparticles containing Ln³⁺ ions (Ce³⁺, Pr³⁺, Gd³⁺, Tb³⁺) was investigated. Sonoluminescence is achieved by irradiating the suspension with ultrasound (27 kHz) in a spherical standing-wave resonator. As found for all suspensions, the luminescence spectra of an immobile bubble contains a structureless continuum with no characteristic bands or Ln³⁺ lines, which is associated with the low probability of nanoparticle penetration into the bubble. For suspensions with Tb³⁺ or Gd³⁺ ions, the narrow bands (quasi-lines of f-f transitions) of these ions are recorded in the spectra of a bubble moving near the resonator’s centre. This is due to the entry of nanoparticles with Ln³⁺ ions into a bubble deformed during the motion and collisional electronic excitation of these ions in nonequilibrium bubble plasma. For suspensions with Ce³⁺ or Pr³⁺ ions, in the moving single-bubble sonoluminescence spectra, the bands corresponding to luminescent d-f transitions of these ions were not found despite their entry into the bubble similar to that of Tb³⁺ and Gd³⁺. This result is explained by much lower probability of collisional excitation during the electronic intershell 4f-5d transition in Ln³⁺ ions compared to the probability of such excitation upon the intrashell 4f-4f transition.

研究了含有Ln ³⁺离子（Ce ³⁺、Pr ³⁺、Gd ³⁺、Tb ³⁺）的SiO ₂纳米颗粒在十二烷中的胶体悬浮液的单气泡声致发光。声致发光是通过在球形驻波谐振器中用超声波 (27 kHz) 照射悬浮液来实现的。对于所有悬浮液，固定气泡的发光光谱包含无特征带或 Ln ³⁺谱线的无结构连续谱，这与纳米粒子渗透到气泡中的可能性较低有关。用于含 Tb ³⁺或 Gd ^{3+ 的}悬浮液离子，这些离子的窄带（ff 跃迁的准线）记录在共振器中心附近移动的气泡的光谱中。这是由于在非平衡气泡等离子体中这些离子的运动和碰撞电子激发期间，具有 Ln ³⁺离子的纳米颗粒进入变形的气泡。对于含有 Ce ³⁺或 Pr ³⁺离子的悬浮液，在移动的单气泡声致发光光谱中，尽管这些离子进入气泡中类似于 Tb ³⁺和 Gd ³的带，但未发现与这些离子的发光 df 跃迁相对应的带⁺。这一结果是由于在 Ln 中电子壳间 4f-5d 跃迁期间碰撞激发的概率要低得多³⁺离子与壳内 4f-4f 跃迁时这种激发的概率相比。